Cellulose ether, yog dav siv nyob rau hauv mortar. Raws li ib yam ntawm etherified cellulose,cellulose ethermuaj affinity rau cov dej, thiab cov polymer compound no muaj cov dej nqus dej zoo heev thiab cov dej tuav tau zoo, uas tuaj yeem daws tau cov tshuaj khib nyiab los ntshav, lub sijhawm ua haujlwm luv luv, nplaum nplaum, thiab lwm yam. Tsis muaj zog pob txha thiab ntau lwm yam teeb meem.
Nrog rau kev txhim kho txuas ntxiv ntawm kev lag luam hauv ntiaj teb kev tsim kho thiab kev tshawb fawb txuas ntxiv ntawm cov khoom siv hauv tsev, kev lag luam ntawm mortar tau dhau los ua ib qho kev tsis sib haum xeeb. Vim muaj ntau yam zoo uas cov tshuaj khib nyiab tsis muaj, kev siv tshuaj khib nyiab tau dhau los ua ntau dua hauv cov nroog loj thiab nruab nrab hauv kuv lub tebchaws. Txawm li cas los xij, kev lag luam mortar tseem muaj ntau yam teeb meem.
High fluidity mortar, xws li cov cuab yeej siv dag zog, cov khoom siv cement-based grouting, thiab lwm yam, vim tias cov dej txo cov neeg siv ntau, yuav ua rau muaj qhov tshwm sim los ntshav loj thiab cuam tshuam rau kev ua haujlwm ntawm mortar; Nws yog qhov rhiab heev, thiab nws yog qhov ua rau poob qis hauv kev ua haujlwm vim dej poob hauv lub sijhawm luv luv tom qab sib tov, uas txhais tau hais tias lub sijhawm ua haujlwm yog luv heev; Nyob rau hauv tas li ntawd, rau bonded mortar, yog hais tias lub mortar muaj peev xwm tuav tsis tau dej txaus, ib tug loj npaum li cas ntawm noo noo yuav absorbed los ntawm lub matrix, uas ua rau ib feem ntawm cov dej tsis txaus ntawm lub tsev cog khoom mortar, thiab yog li ntawd tsis txaus hydration, ua rau ib tug txo nyob rau hauv lub zog thiab ib tug txo nyob rau hauv cohesive quab yuam.
Tsis tas li ntawd, cov khoom sib xyaw ua ib feem ntawm cov cement, xws li ya tshauv, granulated blast furnace slag hmoov (mineral hmoov), silica fume, thiab lwm yam, tam sim no tseem ceeb dua. Raws li kev lag luam los ntawm cov khoom lag luam thiab cov khoom pov tseg, yog tias cov khoom siv tsis tuaj yeem siv tau tag nrho, nws cov khoom sib xyaw ua ke yuav tuav thiab rhuav tshem cov av loj, thiab yuav ua rau muaj kuab paug loj heev. Yog tias siv cov khoom sib xyaw kom haum, lawv tuaj yeem txhim kho qee yam khoom ntawm pob zeb thiab mortar, thiab daws cov teeb meem engineering ntawm pob zeb thiab mortar hauv qee yam kev siv. Yog li ntawd, kev siv dav dav ntawm cov khoom sib xyaw ua ke yog qhov zoo rau ib puag ncig thiab cov txiaj ntsig kev lag luam.
Ntau qhov kev tshawb fawb tau ua tiav hauv tsev thiab txawv teb chaws ntawm cov txiaj ntsig ntawm cellulose ether thiab cov khoom sib xyaw ntawm cov tshuaj khib nyiab, tab sis tseem tsis muaj kev sib tham txog cov txiaj ntsig ntawm kev siv ob qho tib si.
Nyob rau hauv daim ntawv no, qhov tseem ceeb admixtures nyob rau hauv mortar, cellulose ether thiab admixture yog siv nyob rau hauv lub mortar, thiab tag nrho cov kev cai ntawm ob lub Cheebtsam nyob rau hauv lub mortar ntawm lub fluidity thiab lub zog ntawm lub mortar yog sau los ntawm kev sim. Los ntawm kev hloov hom thiab tus nqi ntawm cellulose ether thiab admixtures nyob rau hauv qhov kev xeem, lub zog ntawm lub fluidity thiab lub zog ntawm lub mortar tau soj ntsuam (nyob rau hauv daim ntawv no, lub xeem gelling system feem ntau siv ib tug binary system). Piv nrog HPMC, CMC tsis haum rau kev kho kom tuab thiab dej tuav ntawm cov cement-based cementitious cov ntaub ntawv. HPMC tuaj yeem txo qhov fluidity ntawm slurry thiab nce qhov poob thaum lub sij hawm siv tsawg (hauv qab 0.2%). Txo lub zog ntawm lub mortar lub cev thiab txo qhov compression-rau-fold piv. Kev ua kom muaj dej ntws thiab lub zog, HPMC cov ntsiab lus hauv O. 1% yog qhov tsim nyog dua. Nyob rau hauv cov nqe lus ntawm admixtures, ya tshauv muaj ib tug tej yam nyhuv ntawm kev ua kom lub fluidity ntawm slurry, thiab lub zog ntawm slag hmoov yog tsis pom tseeb. Txawm hais tias silica fume tuaj yeem txo qis los ntshav, qhov fluidity tuaj yeem ploj mus tiag tiag thaum qhov ntau npaum li 3%. . Tom qab kev txiav txim siab zoo, nws tau txiav txim siab tias thaum cov tshauv ya ya tau siv rau hauv cov txheej txheem lossis cov khoom siv ntxiv nrog cov kev xav tau ntawm kev ceev ceev thiab lub zog thaum ntxov, qhov ntau npaum li cas yuav tsum tsis txhob siab dhau, qhov ntau npaum li cas yog li 10%, thiab thaum nws siv rau kev sib txuas. mortar, nws yog ntxiv rau 20%. ‰ tuaj yeem ua tau raws li qhov yuav tsum tau ua; xav txog tej yam xws li qhov tsis zoo ntim ruaj khov ntawm cov ntxhia hmoov thiab silica fume, nws yuav tsum tau tswj qis dua 10% thiab 3% raws li. Cov teebmeem ntawm admixtures thiab cellulose ethers tsis muaj kev sib raug zoo thiab muaj kev ywj pheej.
Tsis tas li ntawd, xa mus rau Feret lub zog txoj kev xav thiab kev ua haujlwm coefficient ntawm cov khoom sib xyaw, daim ntawv no nthuav tawm txoj kev kwv yees tshiab rau lub zog compressive ntawm cov khoom siv cement. Los ntawm kev sib tham txog cov dej num coefficient ntawm cov ntxhia admixtures thiab Feret lub zog txoj kev xav los ntawm qhov ntim ntawm qhov pom thiab tsis quav ntsej txog kev sib cuam tshuam ntawm cov khoom sib txawv, txoj kev no xaus lus tias cov khoom sib xyaw, dej siv thiab cov khoom sib xyaw ua ke muaj ntau yam cuam tshuam rau pob zeb. Txoj cai cuam tshuam ntawm (mortar) lub zog muaj kev taw qhia zoo.
Los ntawm kev ua haujlwm saum toj no, daim ntawv no kos qee qhov theoretical thiab cov tswv yim xaus nrog qee qhov kev siv tus nqi.
Ntsiab lus: cellulose ether,mortar fluidity, workability, ntxhia admixture, lub zog kwv yees
Tshooj 1 Kev Taw Qhia
1.1khoom mortar
1.1.1Taw qhia txog kev lag luam mortar
Hauv kuv lub teb chaws cov ntaub ntawv kev lag luam, cov pob zeb tau ua tiav qib siab ntawm kev lag luam, thiab kev lag luam ntawm mortar kuj tau nce siab dua, tshwj xeeb tshaj yog rau ntau yam tshwj xeeb mortars, cov tuam txhab uas muaj peev xwm ntau dua yuav tsum tau ua kom muaj ntau yam mortars. Cov ntsuas kev ua tau zoo yog tsim nyog. Kev lag luam mortar tau muab faib ua ob pawg: npaj txhij-siv mortar thiab qhuav-siv mortar. Npaj-siv mortar txhais tau hais tias cov mortar raug thauj mus rau qhov chaw tsim kho tom qab sib xyaw nrog dej los ntawm tus neeg muag khoom ua ntej raws li qhov project yuav tsum tau, thaum lub mortar qhuav yog tsim los ntawm cov chaw tsim khoom mortar los ntawm kev sib xyaw qhuav thiab ntim cov ntaub ntawv cementitious, aggregates thiab additives raws li ib qho piv txwv. Ntxiv ib qho dej rau hauv qhov chaw tsim kho thiab sib tov ua ntej siv.
Cov tshuaj khib nyiab muaj ntau qhov tsis zoo hauv kev siv thiab kev ua haujlwm. Piv txwv li, kev sib tsoo ntawm cov khoom siv raw thiab kev sib xyaw ntawm qhov chaw tsis tuaj yeem ua tau raws li cov kev cai ntawm kev tsim kho thiab kev tiv thaiv ib puag ncig. Tsis tas li ntawd, vim yog kev tsim kho ntawm qhov chaw thiab lwm yam laj thawj, nws yog ib qho yooj yim los ua qhov zoo ntawm mortar nyuaj rau lav, thiab nws tsis tuaj yeem tau txais kev ua haujlwm siab. mortar. Piv nrog rau cov tshuaj khib nyiab, kev lag luam mortar muaj qee qhov zoo. Ua ntej ntawm tag nrho cov, nws qhov zoo yog yooj yim los tswj thiab lav, nws cov kev ua tau zoo tshaj, nws hom yog refined, thiab nws yog zoo dua tsom rau engineering yuav tsum. European qhuav-mixed mortar tau tsim nyob rau hauv 1950s, thiab kuv lub teb chaws tseem muaj zog tawm tswv yim rau daim ntawv thov kev lag luam mortar. Shanghai twb tau siv coj mus muag mortar nyob rau hauv 2004. Nrog rau kev txhim kho tas mus li ntawm kuv lub teb chaws cov txheej txheem urbanization, yam tsawg kawg nyob rau hauv lub nroog lag luam, nws yuav inevitable uas coj mus muag mortar nrog ntau yam zoo yuav hloov cov tsoos mortar.
1.1.2Teeb meem uas muaj nyob rau hauv kev lag luam mortar
Txawm hais tias kev lag luam mortar muaj ntau qhov zoo dua li cov tshuaj khib nyiab, tseem muaj ntau yam kev nyuaj raws li mortar. High fluidity mortar, xws li reinforcement mortar, cement-based grouting cov ntaub ntawv, thiab lwm yam, muaj cov kev xav tau siab heev ntawm lub zog thiab kev ua haujlwm, yog li kev siv cov superplasticizers loj, uas yuav ua rau mob hnyav thiab cuam tshuam rau mortar. Kev ua tau zoo; thiab rau qee cov yas mortars, vim tias lawv yog cov rhiab heev rau kev poob dej, nws yog ib qho yooj yim kom muaj kev poob qis hauv kev ua haujlwm vim qhov poob dej hauv lub sijhawm luv luv tom qab sib tov, thiab lub sijhawm ua haujlwm yog luv heev: Ntxiv rau. Nyob rau hauv cov nqe lus ntawm bonding mortar, lub bonding matrix yog feem ntau kuj qhuav. Thaum lub sij hawm kev tsim kho, vim lub peev xwm tsis txaus ntawm cov mortar khaws dej, cov dej ntau yuav nqus los ntawm cov matrix, ua rau cov dej hauv zos tsis txaus ntawm cov khoom sib txuas thiab cov dej tsis txaus. Qhov tshwm sim uas lub zog txo qis thiab cov nplaum nplaum qis.
Nyob rau hauv teb rau cov lus nug saum toj no, ib qho tseem ceeb additive, cellulose ether, yog dav siv nyob rau hauv mortar. Raws li ib yam ntawm etherified cellulose, cellulose ether muaj affinity rau dej, thiab cov polymer compound no muaj zoo heev dej nqus thiab dej retention muaj peev xwm, uas muaj peev xwm daws tau cov ntshav los ntawm mortar, lub sij hawm luv luv ua hauj lwm, stickiness, thiab lwm yam. teeb meem.
Tsis tas li ntawd, cov khoom sib xyaw ua ib feem ntawm cov cement, xws li ya tshauv, granulated blast furnace slag hmoov (mineral hmoov), silica fume, thiab lwm yam, tam sim no tseem ceeb dua. Peb paub tias feem ntau ntawm cov khoom sib xyaw yog cov khoom siv los ntawm kev lag luam xws li hluav taws xob fais fab, smelting steel, smelting ferrosilicon thiab industrial silicon. Yog tias lawv tsis tuaj yeem siv tau tag nrho, cov khoom sib xyaw ua ke yuav nyob thiab rhuav tshem cov av loj thiab ua rau muaj kev puas tsuaj loj. ib puag ncig muaj kuab paug. Ntawm qhov tod tes, yog tias siv cov khoom sib xyaw kom haum, qee qhov khoom ntawm pob zeb thiab mortar tuaj yeem txhim kho, thiab qee qhov teeb meem engineering hauv kev siv cov pob zeb thiab mortar tuaj yeem daws tau zoo. Yog li ntawd, kev siv dav dav ntawm cov khoom siv sib xyaw ua ke muaj txiaj ntsig zoo rau ib puag ncig thiab kev lag luam. muaj txiaj ntsig.
1.2Cellulose ethers
Cellulose ether (cellulose ether) yog ib qho polymer compound nrog ether qauv tsim los ntawm etherification ntawm cellulose. Txhua lub nplhaib glucosyl hauv cellulose macromolecules muaj peb pawg hydroxyl, thawj pawg hydroxyl nyob rau thib rau carbon atom, ib pawg hydroxyl thib ob thiab thib peb carbon atoms, thiab hydrogen hauv pawg hydroxyl yog hloov los ntawm pawg hydrocarbon los tsim cellulose ether. derivatives. yam. Cellulose yog polyhydroxy polymer compound uas tsis yaj lossis yaj, tab sis cellulose tuaj yeem yaj hauv dej, dilute alkali kua thiab organic hnyav tom qab etherification, thiab muaj qee yam thermoplasticity.
Cellulose ether siv cov cellulose ntuj ua raw khoom thiab npaj los ntawm kev hloov tshuaj. Nws tau muab faib ua ob pawg: ionic thiab non-ionic hauv daim ntawv ionized. Nws yog dav siv hauv tshuaj, roj av, kev tsim kho, tshuaj, ceramics thiab lwm yam lag luam. .
1.2.1Kev faib tawm ntawm cellulose ethers rau kev tsim kho
Cellulose ether rau kev tsim kho yog cov ntsiab lus dav dav rau cov khoom lag luam uas tsim los ntawm cov tshuaj tiv thaiv ntawm alkali cellulose thiab etherifying tus neeg saib xyuas nyob rau hauv qee yam mob. Ntau hom cellulose ethers tuaj yeem tau los ntawm kev hloov cov alkali cellulose nrog cov neeg ua haujlwm sib txawv.
1. Raws li cov khoom ionization ntawm cov khoom hloov, cellulose ethers tuaj yeem muab faib ua ob pawg: ionic (xws li carboxymethyl cellulose) thiab non-ionic (xws li methyl cellulose).
2. Raws li hom kev hloov pauv, cellulose ethers tuaj yeem muab faib ua ib qho ethers (xws li methyl cellulose) thiab sib xyaw ethers (xws li hydroxypropyl methyl cellulose).
3. Raws li qhov sib txawv solubility, nws muab faib ua dej-soluble (xws li hydroxyethyl cellulose) thiab organic solvent solubility (xws li ethyl cellulose), thiab lwm yam. Cov ntawv thov tseem ceeb hauv cov tshuaj khib nyiab qhuav yog dej-soluble cellulose, thaum dej. -soluble cellulose Nws muab faib ua hom instant thiab ncua sij hawm dissolution hom tom qab kho deg.
1.2.2 Kev piav qhia ntawm cov txheej txheem ntawm kev ua ntawm cellulose ether hauv mortar
Cellulose ether yog ib qho tseem ceeb admixture los txhim kho cov dej tuav cov khoom ntawm cov khoom sib xyaw qhuav, thiab nws kuj yog ib qho tseem ceeb ntawm cov khoom siv los txiav txim siab tus nqi ntawm cov khoom siv khib nyiab qhuav.
1. Tom qab cov cellulose ether nyob rau hauv mortar yog yaj nyob rau hauv dej, qhov tshwj xeeb nto kev ua kom ntseeg tau tias cov cementitious cov ntaub ntawv zoo thiab uniformly dispersed nyob rau hauv lub slurry system, thiab cellulose ether, raws li ib tug tiv thaiv colloid, muaj peev xwm "encapsulate" khoom hais, Yog li. , lubricating zaj duab xis yog tsim rau sab nrauv, thiab cov zaj duab xis lubricating tuaj yeem ua rau lub cev muaj thixotropy zoo. Uas yog hais tias, qhov ntim yog qhov ruaj khov nyob rau hauv lub xeev sawv, thiab yuav tsis muaj qhov tshwm sim tsis zoo xws li los ntshav los yog stratification ntawm lub teeb thiab hnyav, uas ua rau cov mortar system ruaj khov; Thaum nyob rau hauv lub xeev agitated kev tsim kho, lub cellulose ether yuav ua si lub luag hauj lwm nyob rau hauv txo cov shearing ntawm slurry. Cov nyhuv ntawm kev sib txawv kuj ua rau cov mortar muaj fluidity zoo thiab smoothness thaum lub sij hawm tsim kho thaum lub sij hawm sib tov.
2. Vim yog cov yam ntxwv ntawm nws tus kheej cov qauv molecular, cov tshuaj cellulose ether tuaj yeem khaws cov dej thiab tsis yooj yim ploj tom qab sib xyaw rau hauv mortar, thiab yuav maj mam tso tawm hauv lub sijhawm ntev, uas ua rau lub sijhawm ua haujlwm ntawm lub mortar. thiab muab cov mortar zoo khaws cia thiab ua haujlwm.
1.2.3 Ntau qhov tseem ceeb ntawm kev tsim kho qib cellulose ethers
1. Methyl Cellulose (MC)
Tom qab cov paj rwb refined raug kho nrog alkali, methyl chloride yog siv los ua tus neeg sawv cev etherifying los ua cellulose ether los ntawm cov tshuaj tiv thaiv. Qhov kev hloov pauv dav dav yog 1. Melting 2.0, qhov degree ntawm kev hloov pauv txawv thiab cov solubility kuj txawv. belongs rau non-ionic cellulose ether.
2. Hydroxyethyl Cellulose (HEC)
Nws yog npaj los ntawm reacting nrog ethylene oxide raws li ib tug etherifying tus neeg sawv cev nyob rau hauv lub xub ntiag ntawm acetone tom qab lub refined paj rwb yog kho nrog alkali. Qhov kev hloov pauv feem ntau yog 1.5 txog 2.0. Nws muaj zog hydrophilicity thiab yooj yim rau nqus noo noo.
3. Hydroxypropyl methylcellulose (HPMC)
Hydroxypropyl methylcellulose yog ib hom cellulose uas nws cov zis thiab noj tau nce sai heev hauv xyoo tas los no. Nws yog non-ionic cellulose tov ether ua los ntawm refined paj rwb tom qab kho alkali, siv propylene oxide thiab methyl chloride ua etherifying agents, thiab los ntawm ib tug series ntawm cov tshuaj tiv thaiv. Qhov kev hloov pauv feem ntau yog 1.2 txog 2.0. Nws cov khoom sib txawv raws li qhov sib piv ntawm cov ntsiab lus methoxyl thiab hydroxypropyl cov ntsiab lus.
4. Carboxymethylcellulose (CMC)
Ionic cellulose ether yog npaj los ntawm ntuj fibers (paj rwb, thiab lwm yam) tom qab alkali kev kho mob, siv sodium monochloroacetate ua ib tug etherifying tus neeg saib xyuas, thiab los ntawm ib tug series ntawm cov tshuaj tiv thaiv. Qhov kev hloov pauv feem ntau yog 0.4-d. 4. Nws qhov kev ua tau zoo heev cuam tshuam los ntawm qib kev hloov pauv.
Ntawm lawv, hom thib peb thiab plaub yog ob hom cellulose siv hauv qhov kev sim no.
1.2.4 Kev Txhim Kho ntawm Cellulose Ether Kev Lag Luam
Tom qab xyoo ntawm txoj kev loj hlob, kev lag luam cellulose ether nyob rau hauv cov teb chaws tsim tau dhau los ua neeg paub tab, thiab kev lag luam hauv cov teb chaws tseem tab tom loj hlob, uas yuav dhau los ua lub zog tseem ceeb rau kev loj hlob ntawm ntiaj teb cellulose ether noj yav tom ntej. Tam sim no, tag nrho lub ntiaj teb no muaj peev xwm ntawm cellulose ether tshaj 1 lab tons, nrog rau cov teb chaws Europe accounting rau 35% ntawm tag nrho cov thoob ntiaj teb noj, raws li Asia thiab North America. Carboxymethyl cellulose ether (CMC) yog hom neeg siv khoom loj, suav txog 56% ntawm tag nrho, ua raws li methyl cellulose ether (MC/HPMC) thiab hydroxyethyl cellulose ether (HEC), suav txog 56% ntawm tag nrho. 25% thiab 12%. Kev lag luam txawv teb chaws cellulose ether muaj kev sib tw heev. Tom qab ntau qhov kev sib koom ua ke, cov khoom tsim tawm yog tsom rau ntau lub tuam txhab loj, xws li Dow Chemical Company thiab Hercules Company hauv Tebchaws Meskas, Akzo Nobel hauv Netherlands, Noviant hauv Finland thiab DAICEL hauv Nyiv, thiab lwm yam.
kuv lub teb chaws yog cov neeg tsim khoom loj tshaj plaws hauv ntiaj teb thiab cov neeg siv khoom ntawm cellulose ether, nrog qhov nruab nrab txhua xyoo kev loj hlob ntawm ntau tshaj 20%. Raws li kev txheeb cais ua ntej, muaj txog 50 cellulose ether cov tuam txhab tsim khoom hauv Suav teb. Cov tsim tsim muaj peev xwm ntawm cov cellulose ether kev lag luam tau tshaj 400,000 tons, thiab muaj txog 20 lub tuam txhab uas muaj peev xwm ntawm ntau tshaj 10,000 tons, feem ntau nyob rau hauv Shandong, Hebei, Chongqing thiab Jiangsu. , Zhejiang, Shanghai thiab lwm qhov chaw. Nyob rau hauv 2011, Tuam Tshoj lub CMC muaj peev xwm ntau lawm txog 300,000 tons. Nrog rau qhov kev thov ntau ntxiv rau cov khoom lag luam zoo cellulose ethers hauv cov tshuaj, khoom noj, tshuaj txhua hnub thiab lwm yam kev lag luam hauv xyoo tas los no, kev thov hauv tsev rau lwm cov khoom siv cellulose ether uas tsis yog CMC yog nce. Loj dua, lub peev xwm ntawm MC / HPMC yog kwv yees li 120,000 tons, thiab lub peev xwm ntawm HEC yog li 20,000 tons. PAC tseem nyob rau theem ntawm kev nce qib thiab thov hauv Suav teb. Nrog rau kev loj hlob ntawm cov roj av loj loj thiab kev tsim cov khoom siv hauv tsev, khoom noj khoom haus, tshuaj thiab lwm yam kev lag luam, cov nyiaj thiab kev lag luam ntawm PAC tau nce thiab nthuav tawm txhua xyoo, nrog lub peev xwm tsim tau ntau dua 10,000 tons.
1.3Kev tshawb fawb txog kev siv cellulose ether rau mortar
Hais txog engineering daim ntawv thov kev tshawb fawb ntawm cellulose ether hauv kev tsim kho kev lag luam, cov kws tshawb fawb hauv tsev thiab txawv teb chaws tau ua ntau qhov kev tshawb fawb thiab kev tshawb fawb txog kev siv tshuab.
1.3.1Kev qhia luv luv ntawm kev tshawb fawb txawv teb chaws ntawm kev siv cellulose ether rau mortar
Laetitia Patural, Philippe Marchal thiab lwm tus hauv Fab Kis tau taw qhia tias cellulose ether muaj qhov cuam tshuam loj rau cov dej khaws cia ntawm cov mortar, thiab cov txheej txheem tsis sib xws yog tus yuam sij, thiab qhov hnyav molecular yog tus yuam sij los tswj cov dej tuav thiab sib xws. Nrog rau qhov nce ntawm qhov hnyav molecular, cov txiaj ntsig kev ntxhov siab txo qis, qhov sib xws nce, thiab cov dej tuav tau nce ntxiv; ntawm qhov tsis sib xws, cov qib molar hloov pauv (txog rau cov ntsiab lus ntawm hydroxyethyl lossis hydroxypropyl) tsis tshua muaj txiaj ntsig rau cov dej tuav ntawm cov tshuaj khib nyiab qhuav. Txawm li cas los xij, cellulose ethers nrog qis molar degrees ntawm kev hloov pauv tau txhim kho dej tuav.
Lub ntsiab lus tseem ceeb ntawm cov dej tuav cov txheej txheem yog tias cov khoom rheological ntawm cov mortar yog qhov tseem ceeb. Nws tuaj yeem pom los ntawm cov txiaj ntsig kev sim uas rau cov tshuaj khib nyiab qhuav nrog cov dej ruaj khov-cement piv thiab cov ntsiab lus sib xyaw, cov dej tuav kev ua haujlwm feem ntau muaj tib yam li nws qhov sib xws. Txawm li cas los xij, rau qee cov cellulose ethers, cov qauv tsis pom tseeb; Tsis tas li ntawd, rau cov hmoov txhuv nplej siab ethers, muaj qhov sib txawv. Lub viscosity ntawm cov khoom sib xyaw tshiab tsis yog tib qho kev ntsuas rau kev txiav txim siab khaws dej.
Laetitia Patural, Patrice Potion, thiab al., nrog kev pab los ntawm pulsed teb gradient thiab MRI cov tswv yim, pom tau hais tias cov ya raws tsiv teb tsaws ntawm lub interface ntawm mortar thiab unsaturated substrate yog cuam tshuam los ntawm qhov sib ntxiv ntawm ib tug me me ntawm CE. Kev poob dej yog vim kev ua ntawm capillary es tsis yog dej diffusion. Moisture migration los ntawm capillary kev txiav txim yog tswj hwm los ntawm substrate micropore siab, uas nyob rau hauv lem yog txiav txim los ntawm micropore loj thiab Laplace txoj kev xav interfacial nro, nrog rau cov kua viscosity. Qhov no qhia tau hais tias cov khoom rheological ntawm CE aqueous tov yog tus yuam sij rau kev tuav dej. Txawm li cas los xij, qhov kev xav no cuam tshuam qee qhov kev pom zoo (lwm cov tackifiers xws li siab molecular polyethylene oxide thiab starch ethers tsis zoo li CE).
Jean. Yves Petit, Erie Wirquin et al. siv cellulose ether los ntawm kev sim, thiab nws 2% kua viscosity yog los ntawm 5000 txog 44500mpa. S xws li MC thiab HEMC. Nrhiav:
1. Rau cov nqi ruaj khov ntawm CE, hom CE muaj kev cuam tshuam zoo rau cov viscosity ntawm cov nplaum nplaum rau cov vuas. Qhov no yog vim muaj kev sib tw ntawm CE thiab dispersible polymer hmoov rau adsorption ntawm cement hais.
2. Kev sib tw adsorption ntawm CE thiab roj hmab hmoov muaj txiaj ntsig zoo rau lub sijhawm teem thiab spalling thaum lub sijhawm tsim kho yog 20-30min.
3. Lub zog ntawm daim ntawv cog lus yog cuam tshuam los ntawm kev sib koom ua ke ntawm CE thiab roj hmab hmoov. Thaum CE zaj duab xis tsis tuaj yeem tiv thaiv cov evaporation ntawm noo noo ntawm qhov sib txuas ntawm cov pobzeb thiab cov mortar, qhov adhesion nyob rau hauv kub curing txo qis.
4. Kev sib koom tes thiab kev sib cuam tshuam ntawm CE thiab dispersible polymer hmoov yuav tsum tau muab rau hauv kev txiav txim siab thaum tsim qhov feem ntawm cov nplaum nplaum rau cov vuas.
Lub teb chaws Yelemees LschmitzC. J. Dr. H(a)cker tau hais hauv tsab xov xwm tias HPMC thiab HEMC hauv cellulose ether muaj lub luag haujlwm tseem ceeb hauv kev khaws dej hauv cov tshuaj khib nyiab qhuav. Ntxiv nrog rau kev ua kom cov dej ruaj khov ntawm cov cellulose ether, nws raug nquahu kom siv cov Cellulose ethers hloov kho thiab txhim kho cov khoom ua haujlwm ntawm mortar thiab cov khoom ntawm cov tshuaj khib nyiab qhuav thiab tawv tawv.
1.3.2Kev qhia luv luv ntawm kev tshawb fawb hauv tsev ntawm kev siv cellulose ether rau mortar
Xin Quanchang los ntawm Xi'an University of Architecture thiab Technology tau kawm txog kev cuam tshuam ntawm ntau yam polymers ntawm qee yam khoom ntawm kev sib txuas mortar, thiab pom tias kev sib xyaw siv cov hmoov polymer dispersible thiab hydroxyethyl methyl cellulose ether tsis tuaj yeem txhim kho kev ua tau zoo ntawm kev sib koom ua ke mortar, tab sis kuj tuaj yeem ua ib feem ntawm tus nqi txo; Cov txiaj ntsig kev ntsuam xyuas pom tau tias thaum cov ntsiab lus ntawm redispersible latex hmoov yog tswj ntawm 0.5%, thiab cov ntsiab lus ntawm hydroxyethyl methyl cellulose ether yog tswj ntawm 0.2%, lub mortar npaj yog resistant rau dabtsi yog khoov. thiab kev sib txuas lub zog yog qhov tseem ceeb dua, thiab muaj qhov yooj yim thiab plasticity.
Xib fwb Ma Baoguo los ntawm Wuhan University of Technology tau taw qhia tias cellulose ether muaj cov nyhuv retardation pom tseeb, thiab tuaj yeem cuam tshuam rau cov qauv ntawm cov khoom siv dej thiab cov pore qauv ntawm cov cement slurry; cellulose ether feem ntau yog adsorbed rau saum npoo ntawm cov cement hais los ua ib qho kev cuam tshuam. Nws cuam tshuam cov nucleation thiab kev loj hlob ntawm cov khoom hydration; Ntawm qhov tod tes, cellulose ether cuam tshuam kev tsiv teb tsaws thiab kev nthuav dav ntawm ions vim nws qhov pom tseeb viscosity nce cov nyhuv, yog li ncua cov dej ntawm cov cement mus rau qee yam; cellulose ether muaj alkali stability.
Jian Shouwei los ntawm Wuhan University of Technology tau xaus lus tias lub luag haujlwm ntawm CE hauv mortar feem ntau yog tshwm sim hauv peb yam: cov dej tuav tau zoo, cuam tshuam rau cov tshuaj khib nyiab sib xws thiab thixotropy, thiab kev hloov kho ntawm rheology. CE tsis tsuas yog muab cov tshuaj khib nyiab ua haujlwm zoo xwb, tab sis kuj txhawm rau txo qis cov dej kub thaum ntxov ntawm cov cement thiab ncua cov txheej txheem dej kinetic ntawm cov cement, tau kawg, raws li kev siv sib txawv ntawm mortar, kuj tseem muaj qhov sib txawv ntawm nws txoj kev ntsuas kev ua haujlwm. .
CE hloov mortar yog siv nyob rau hauv daim ntawv ntawm nyias-txheej mortar nyob rau hauv txhua txhua hnub qhuav-siv mortar (xws li cib binder, putty, nyias-txheej plastering mortar, thiab lwm yam). Cov qauv tshwj xeeb no feem ntau yog nrog los ntawm kev poob dej sai ntawm cov mortar. Tam sim no, kev tshawb fawb tseem ceeb tsom mus rau lub ntsej muag pobzeb nplaum, thiab tsis tshua muaj kev tshawb fawb txog lwm hom nyias-txheej CE hloov mortar.
Su Lei los ntawm Wuhan University of Technology tau txais los ntawm kev sim tshuaj ntsuam xyuas ntawm cov dej khaws cia, dej poob thiab teeb tsa lub sijhawm ntawm cov mortar hloov nrog cellulose ether. Tus nqi ntawm cov dej txo qis, thiab lub sijhawm coagulation yog ntev; thaum cov dej nce mus txog O. Tom qab 6%, qhov kev hloov ntawm cov dej tuav thiab cov dej poob tsis pom tseeb lawm, thiab lub sij hawm teeb tsa yog ze li ob npaug; thiab txoj kev tshawb fawb ntawm nws lub zog compressive qhia tau hais tias thaum cov ntsiab lus ntawm cellulose ether qis dua 0.8%, cov ntsiab lus ntawm cellulose ether tsawg dua 0.8%. Qhov nce yuav txo qhov compressive zog; thiab nyob rau hauv cov nqe lus ntawm kev sib koom ua ke nrog cov cement mortar board, O. Hauv qab 7% ntawm cov ntsiab lus, qhov nce ntawm cov ntsiab lus ntawm cellulose ether tuaj yeem txhim kho kev sib raug zoo.
Lai Jianqing ntawm Xiamen Hongye Engineering Construction Technology Co., Ltd. soj ntsuam thiab xaus lus tias qhov kev pom zoo ntawm cellulose ether thaum txiav txim siab txog cov dej tuav thiab qhov ntsuas qhov sib xws yog 0 los ntawm kev ntsuam xyuas ntawm cov dej tuav tus nqi, lub zog thiab daim ntawv cog lus lub zog. EPS thermal rwb thaiv tsev mortar. 2% yog '; cellulose ether muaj zog cua-entraining nyhuv, uas yuav ua rau ib tug txo nyob rau hauv lub zog, tshwj xeeb tshaj yog ib tug txo nyob rau hauv tensile daim ntawv cog lus zog, yog li nws yog pom zoo kom siv nws ua ke nrog redispersible polymer hmoov.
Yuan Wei thiab Qin Min ntawm Xinjiang Lub Tsev Cov Khoom Siv Tshawb Fawb tau ua qhov kev sim thiab kev tshawb fawb ntawm cellulose ether hauv cov pob zeb ua npuas. Cov txiaj ntsig kev sim qhia tau hais tias HPMC txhim kho cov dej khaws cia ntawm cov ua npuas ncauj tshiab thiab txo cov dej poob ntawm cov pob zeb tawv tawv; HPMC tuaj yeem txo qhov poob qis ntawm cov ua npuas ncauj tshiab thiab txo qhov rhiab heev ntawm qhov sib xyaw kom sov. ; HPMC yuav txo qhov compressive zog ntawm cov pob zeb ua npuas ncauj. Nyob rau hauv tej yam ntuj tso curing tej yam kev mob, ib tug npaum li cas ntawm HPMC tuaj yeem txhim kho lub zog ntawm cov qauv mus rau ib qho twg.
Li Yuhai ntawm Wacker Polymer Materials Co., Ltd. tau taw qhia tias hom thiab ntau npaum li cas ntawm cov hmoov latex, hom cellulose ether thiab curing ib puag ncig muaj kev cuam tshuam tseem ceeb ntawm kev cuam tshuam ntawm plastering mortar. Cov txiaj ntsig ntawm cellulose ethers ntawm kev cuam tshuam lub zog kuj tseem tsis txaus ntseeg piv rau cov ntsiab lus polymer thiab kho cov mob.
Yin Qingli ntawm AkzoNobel Specialty Chemicals (Shanghai) Co., Ltd. siv Bermocoll PADl, tshwj xeeb hloov polystyrene board bonding cellulose ether, rau kev sim, uas yog tshwj xeeb tshaj yog haum rau lub tsev cog khoom mortar ntawm EPS sab nrauv phab ntsa rwb thaiv tsev system. Bermocoll PADl tuaj yeem txhim kho lub zog sib txuas ntawm mortar thiab polystyrene board ntxiv rau txhua txoj haujlwm ntawm cellulose ether. Txawm hais tias qhov tsawg npaum li cas, nws tuaj yeem tsis tsuas yog txhim kho cov dej tuav thiab kev ua haujlwm ntawm cov mortar tshiab, tab sis kuj tuaj yeem txhim kho qhov qub kev sib raug zoo thiab cov dej-resistant bonding zog ntawm mortar thiab polystyrene board vim qhov tshwj xeeb anchoring. tshuab. . Txawm li cas los xij, nws tsis tuaj yeem txhim kho qhov cuam tshuam ntawm mortar thiab kev sib koom ua ke nrog polystyrene board. Txhawm rau txhim kho cov khoom no, yuav tsum tau siv cov hmoov redispersible latex.
Wang Peiming los ntawm Tongji University tau tshuaj xyuas keeb kwm kev loj hlob ntawm kev lag luam mortar thiab taw qhia tias cellulose ether thiab latex hmoov muaj qhov cuam tshuam tsis zoo rau cov ntsuas kev ua tau zoo xws li dej tuav, flexural thiab compressive zog, thiab elastic modulus ntawm qhuav hmoov coj mus muag mortar.
Zhang Lin thiab lwm tus ntawm Shantou Special Economic Zone Longhu Technology Co., Ltd. tau xaus lus tias, nyob rau hauv lub tsev cog khoom mortar ntawm nthuav polystyrene board nyias plastering sab nrauv phab ntsa sab nrauv thermal rwb thaiv tsev system (ie Eqos system), nws yog pom zoo kom tus nqi zoo. roj hmab hmoov yog 2.5% yog qhov txwv; Tsis tshua muaj viscosity, hloov kho cellulose ether yog qhov kev pab zoo rau kev txhim kho cov pab pawg tensile zog ntawm cov tshuaj khib nyiab.
Zhao Lujun ntawm Shanghai Lub Tsev Haujlwm ntawm Kev Tshawb Fawb Kev Ua Haujlwm Hauv Tsev, thiab siv tau ntau lub cug cug, thiab lub teeb tsa dav dav lub sijhawm mortar. Nyob rau tib lub sijhawm, cellulose ether nrog cov viscosity siab yog qhov zoo rau kev txhim kho cov dej tuav tus nqi ntawm mortar, tab sis lub zog compressive txo qis dua thiab lub sijhawm teem sijhawm ntev dua. Thickening hmoov thiab cellulose ether tshem tawm cov yas shrinkage cracking ntawm mortar los ntawm kev txhim kho cov dej tuav ntawm mortar.
Fuzhou University Huang Lipin thiab al tau kawm txog doping ntawm hydroxyethyl methyl cellulose ether thiab ethylene. Lub cev muaj zog thiab kev sib tshuam morphology ntawm hloov cov cement mortar ntawm vinyl acetate copolymer latex hmoov. Nws tau pom tias cellulose ether muaj cov dej tuav tau zoo, kev nqus dej tsis zoo thiab cov txiaj ntsig zoo ntawm huab cua, thaum lub zog txo cov dej ntawm cov hmoov latex thiab kev txhim kho cov khoom siv ntawm cov tshuaj khib nyiab yog qhov tshwj xeeb. Hloov cov nyhuv; thiab muaj ntau npaum li cas ntawm cov polymers.
Los ntawm kev sim ntau, Chen Qian thiab lwm tus los ntawm Hubei Baoye Siv Kev Tsim Kho Kev Lag Luam Co., Ltd. tau ua pov thawj tias txuas ntxiv lub sijhawm nplawm thiab ua kom nrawm nrawm tuaj yeem muab kev ua si tag nrho rau lub luag haujlwm ntawm cellulose ether nyob rau hauv cov khoom sib xyaw ua ke, txhim kho cov khoom siv. workability ntawm mortar, thiab txhim kho lub sij hawm stirring. luv luv lossis qeeb qeeb yuav ua rau lub mortar nyuaj rau kev tsim; xaiv txoj cai cellulose ether tuaj yeem txhim kho kev ua haujlwm ntawm cov khoom sib xyaw npaj txhij.
Li Sihan los ntawm Shenyang Jianzhu University thiab lwm tus tau pom tias cov khoom siv ntxhia tuaj yeem txo qhov qhuav shrinkage deformation ntawm mortar thiab txhim kho nws cov khoom siv kho tshuab; qhov sib piv ntawm txiv qaub rau xuab zeb muaj kev cuam tshuam rau cov khoom siv kho tshuab thiab shrinkage tus nqi ntawm mortar; redispersible polymer hmoov tuaj yeem txhim kho lub mortar. Crack kuj, txhim kho adhesion, flexural zog, cohesion, cuam tshuam thiab hnav tsis kam, txhim kho dej tuav thiab ua haujlwm; cellulose ether muaj huab cua-entraining nyhuv, uas tuaj yeem txhim kho cov dej tuav ntawm mortar; ntoo fiber ntau tuaj yeem txhim kho mortar Txhim kho qhov yooj yim ntawm kev siv, kev ua haujlwm, thiab kev ua haujlwm tsis zoo, thiab kev tsim kho kom nrawm. Los ntawm kev ntxiv ntau yam admixtures rau kev hloov kho, thiab los ntawm qhov tsim nyog piv, tawg-resistant mortar rau sab nrauv phab ntsa thermal rwb thaiv tsev nrog kev ua tau zoo heev tuaj yeem npaj tau.
Yang Lei ntawm Henan University of Technology tau sib xyaw HEMC rau hauv mortar thiab pom tias nws muaj ob txoj haujlwm ntawm cov dej tuav thiab thickening, uas tiv thaiv cov huab cua-entrained pob zeb los ntawm sai absorbing dej nyob rau hauv lub plastering mortar, thiab xyuas kom meej tias cov cement nyob rau hauv lub pob zeb. mortar yog tag nrho hydrated, ua rau lub mortar Kev sib xyaw nrog aerated qhob yog denser thiab daim ntawv cog lus muaj zog dua; nws tuaj yeem txo qhov delamination ntawm plastering mortar rau aerated qhob. Thaum HEMC tau ntxiv rau hauv mortar, lub zog flexural ntawm lub mortar txo qis me ntsis, thaum lub zog compressive txo qis heev, thiab qhov sib piv-compression piv nkhaus pom qhov nce siab, qhia tias qhov sib ntxiv ntawm HEMC tuaj yeem txhim kho qhov toughness ntawm mortar.
Li Yanling thiab lwm tus los ntawm Henan University of Technology tau pom tias cov khoom siv ntawm cov tshuaj khib nyiab tau txhim kho zoo dua piv nrog cov tshuaj khib nyiab zoo tib yam, tshwj xeeb tshaj yog cov ntawv cog lus lub zog ntawm cov tshuaj khib nyiab, thaum cov khoom sib xyaw ntxiv (cov ntsiab lus ntawm cellulose ether yog 0.15%). Nws yog 2.33 npaug ntawm cov mortar zoo tib yam.
Ma Baoguo los ntawm Wuhan University of Technology thiab lwm tus tau kawm txog cov teebmeem ntawm ntau npaum li cas ntawm styrene-acrylic emulsion, dispersible polymer hmoov, thiab hydroxypropyl methylcellulose ether ntawm cov dej noj, daim ntawv cog lus lub zog thiab toughness ntawm nyias plastering mortar. , pom tias thaum cov ntsiab lus ntawm styrene-acrylic emulsion yog 4% mus rau 6%, cov nyiaj cog lus lub zog ntawm mortar mus txog qhov zoo tshaj plaws tus nqi, thiab compression-folding piv yog qhov tsawg tshaj plaws; cov ntsiab lus ntawm cellulose ether nce mus rau O. Ntawm 4%, cov nyiaj cog lus lub zog ntawm mortar ncav cuag saturation, thiab compression-folding piv yog qhov tsawg tshaj plaws; Thaum cov ntsiab lus ntawm roj hmab hmoov yog 3%, lub zog sib txuas ntawm mortar yog qhov zoo tshaj plaws, thiab qhov sib piv-folding txo qis nrog qhov sib ntxiv ntawm cov hmoov roj hmab. sib.
Li Qiao thiab lwm tus ntawm Shantou Special Economic Zone Longhu Technology Co., Ltd. tau taw qhia hauv tsab xov xwm hais tias cov haujlwm ntawm cellulose ether hauv cov cement mortar yog dej tuav, thickening, cua nkag, retardation thiab txhim kho tensile daim ntawv cog lus lub zog, thiab lwm yam. Kev ua haujlwm sib raug rau Thaum kuaj thiab xaiv MC, cov ntsuas ntawm MC uas yuav tsum tau txiav txim siab suav nrog viscosity, qib ntawm etherification hloov, qib kev hloov kho, khoom ruaj khov, cov ntsiab lus zoo, particle loj thiab lwm yam. Thaum xaiv MC nyob rau hauv cov khoom sib txawv mortar, cov kev ua tau zoo ntawm MC nws tus kheej yuav tsum tau muab tso rau pem hauv ntej raws li kev tsim kho thiab siv cov kev cai ntawm cov khoom mortar tshwj xeeb, thiab cov khoom tsim nyog MC yuav tsum raug xaiv ua ke nrog cov muaj pes tsawg leeg thiab cov ntsiab lus ntsuas ntawm MC.
Qiu Yongxia ntawm Beijing Wanbo Huijia Science thiab Trade Co., Ltd. pom tau hais tias nrog kev nce ntawm cov viscosity ntawm cellulose ether, cov dej tuav tus nqi ntawm cov mortar nce; qhov zoo dua cov khoom ntawm cellulose ether, qhov zoo dua cov dej tuav; Qhov siab dua cov dej tuav tus nqi ntawm cellulose ether; Cov dej tuav ntawm cellulose ether txo qis nrog qhov nce ntawm qhov kub thiab txias.
Zhang Bin ntawm Tongji University thiab lwm tus tau taw qhia nyob rau hauv tsab xov xwm hais tias cov yam ntxwv ntawm kev hloov kho mortar yog ze ze rau kev txhim kho viscosity ntawm cellulose ethers, tsis yog tias cov cellulose ethers nrog siab nominal viscosity muaj kev cuam tshuam rau cov yam ntxwv ua haujlwm, vim lawv yog kuj cuam tshuam los ntawm particle loj. , dissolution tus nqi thiab lwm yam.
Zhou Xiao thiab lwm tus los ntawm Lub Tsev Haujlwm Saib Xyuas Kev Cai Lij Choj Kev Tiv Thaiv Kev Tshawb Fawb thiab thev naus laus zis, Tuam Tshoj Cultural Heritage Research Institute tau kawm txog kev koom tes ntawm ob qho khoom ntxiv, polymer roj hmab hmoov thiab cellulose ether, rau lub zog ntawm daim ntawv cog lus hauv NHL (hydraulic txiv qaub) mortar system, thiab pom tias qhov yooj yim Vim lub shrinkage ntau dhau ntawm hydraulic txiv qaub, nws tsis tuaj yeem tsim lub zog tensile txaus nrog lub pob zeb cuam tshuam. Qhov tsim nyog ntawm cov roj hmab roj hmab hmoov thiab cellulose ether tuaj yeem txhim kho lub zog sib txuas ntawm NHL mortar thiab ua tau raws li cov kev cai ntawm kev coj noj coj ua thiab kev tiv thaiv cov ntaub ntawv; txhawm rau tiv thaiv Nws muaj kev cuam tshuam rau cov dej permeability thiab breathability ntawm NHL mortar nws tus kheej thiab kev sib raug zoo nrog masonry kab lis kev cai relics. Nyob rau tib lub sijhawm, xav txog kev sib koom ua ke ntawm NHL mortar, qhov zoo tagnrho ntxiv ntawm cov roj hmab roj hmab hmoov yog qis dua 0.5% mus rau 1%, thiab qhov sib ntxiv ntawm cellulose ether Tus nqi yog tswj ntawm li 0.2%.
Duan Pengxuan thiab lwm tus los ntawm lub koom haum Beijing Institute of Building Materials Science tau ua ob tus kheej tsim cov rheological testers los ntawm kev tsim cov qauv rheological ntawm cov mortar tshiab, thiab ua rheological tsom xam ntawm cov khoom siv pob zeb zoo tib yam, plastering mortar thiab plastering gypsum khoom. Lub denaturation tau ntsuas, thiab nws tau pom tias hydroxyethyl cellulose ether thiab hydroxypropyl methyl cellulose ether muaj qhov pib zoo dua tus nqi viscosity thiab viscosity txo kev ua tau zoo nrog lub sij hawm thiab ceev nce, uas tuaj yeem txhawb cov binder rau hom kev sib txuas zoo dua, thixotropy thiab plam tsis kam.
Li Yanling ntawm Henan University of Technology thiab lwm tus pom tias qhov sib ntxiv ntawm cellulose ether nyob rau hauv mortar tuaj yeem txhim kho cov dej khaws cia ntawm cov mortar, yog li ua kom muaj kev vam meej ntawm cov cement hydration. Txawm hais tias qhov sib ntxiv ntawm cellulose ether txo lub zog flexural thiab compressive lub zog ntawm lub mortar, nws tseem ua rau cov flexural-compression piv thiab cov ntawv cog lus lub zog ntawm mortar rau qee yam.
1.4Kev tshawb fawb txog kev siv cov khoom sib tov rau cov tshuaj khib hauv tsev thiab txawv teb chaws
Hauv kev lag luam niaj hnub no, kev tsim khoom thiab kev siv cov pob zeb thiab mortar yog qhov loj, thiab qhov kev thov rau cov cement kuj nce ntxiv. Kev tsim cov cement yog kev siv hluav taws xob siab thiab kev lag luam muaj kuab paug siab. Txuag cement yog qhov tseem ceeb heev los tswj cov nqi thiab tiv thaiv ib puag ncig. Raws li ib feem ntawm cov cement, ntxhia admixture tuaj yeem tsis tsuas yog txhim kho kev ua haujlwm ntawm mortar thiab pob zeb, tab sis kuj txuag tau ntau cov cement nyob rau hauv cov xwm txheej ntawm kev siv tsim nyog.
Hauv kev lag luam khoom siv hauv tsev, kev siv cov khoom sib xyaw ua ke tau dav heev. Ntau ntau hom cement muaj ntau lossis tsawg dua ib qho ntawm cov khoom sib xyaw. Ntawm lawv, feem ntau siv dav Portland cement yog ntxiv 5% hauv kev tsim khoom. ~ 20% admixture. Nyob rau hauv cov txheej txheem ntau lawm ntawm ntau yam mortar thiab qhob ntau lawm tuam txhab, daim ntawv thov ntawm admixtures yog dav dua.
Rau kev siv cov khoom sib xyaw hauv mortar, kev tshawb fawb ntev thiab dav tau ua nyob hauv tsev thiab txawv teb chaws.
1.4.1Cov lus qhia luv luv ntawm kev tshawb fawb txawv teb chaws ntawm kev sib xyaw siv rau mortar
P. University of California. JM Momeiro Joe IJ K. Wang et al. pom tias nyob rau hauv cov txheej txheem hydration ntawm cov khoom siv gelling, gel tsis swelled nyob rau hauv sib npaug ntim, thiab cov ntxhia admixture tuaj yeem hloov cov hydrated gel, thiab pom tias qhov o ntawm cov gel muaj feem xyuam rau cov divalent cations hauv cov gel. . Tus naj npawb ntawm cov ntawv luam pom muaj qhov cuam tshuam tsis zoo.
Kevin J., USA. Folliard thiab Makoto Ohta et al. taw qhia tias qhov sib ntxiv ntawm silica fume thiab mov husk tshauv rau hauv mortar tuaj yeem txhim kho lub zog compressive, thaum ntxiv ntawm ya tshauv txo lub zog, tshwj xeeb tshaj yog nyob rau theem pib.
Philippe Lawrence thiab Martin Cyr ntawm Fabkis tau pom tias muaj ntau yam minerals admixtures tuaj yeem txhim kho lub mortar zog raws li qhov tsim nyog. Qhov sib txawv ntawm cov ntxhia sib txawv yog tsis pom tseeb nyob rau theem pib ntawm hydration. Nyob rau theem tom ntej ntawm hydration, qhov ntxiv zog ntxiv yog cuam tshuam los ntawm kev ua haujlwm ntawm cov ntxhia sib xyaw, thiab lub zog nce los ntawm inert admixture tsis tuaj yeem suav tias yog sau. cov nyhuv, tab sis yuav tsum tau ntaus nqi rau lub cev cov nyhuv ntawm multiphase nucleation.
Bulgaria's ValIly0 Stoitchkov Stl Petar Abadjiev thiab lwm tus pom tias cov khoom siv hauv paus yog silica fume thiab qis-calcium ya tshauv los ntawm lub cev thiab cov khoom siv ntawm cov cement mortar thiab pob zeb sib xyaw nrog cov khoom siv pozzolanic, uas tuaj yeem txhim kho lub zog ntawm cov cement pob zeb. Silica fume muaj qhov cuam tshuam tseem ceeb ntawm cov dej thaum ntxov ntawm cov ntaub ntawv cementitious, thaum cov hmoov tshauv ya ya muaj qhov cuam tshuam tseem ceeb rau cov dej tom qab.
1.4.2Cov lus qhia luv luv ntawm kev tshawb fawb hauv tsev ntawm kev siv cov khoom sib xyaw rau mortar
Los ntawm kev tshawb fawb soj ntsuam, Zhong Shiyun thiab Xiang Keqin ntawm Tongji University pom tias cov khoom sib xyaw hloov kho ntawm cov hmoov tshauv ya thiab polyacrylate emulsion (PAE), thaum qhov sib piv poly-binder tau kho ntawm 0.08, compression-folding piv ntawm mortar nce nrog Lub fineness thiab cov ntsiab lus ntawm yoov tshauv txo nrog qhov nce ntawm ya tshauv. Nws tau npaj siab tias qhov sib ntxiv ntawm cov tshauv ya tuaj yeem daws tau qhov teeb meem ntawm tus nqi siab ntawm kev txhim kho qhov hloov pauv ntawm cov mortar los ntawm kev nce cov ntsiab lus ntawm polymer.
Wang Yinong ntawm Wuhan Iron thiab Steel Civil Siv Lub Tuam Txhab tau kawm txog kev ua haujlwm siab mortar admixture, uas tuaj yeem txhim kho kev ua haujlwm ntawm mortar, txo qhov degree ntawm delamination, thiab txhim kho kev sib koom ua ke. Nws yog tsim rau masonry thiab plastering ntawm aerated qhob blocks. .
Chen Miaomiao thiab lwm tus los ntawm Nanjing University of Technology tau kawm txog cov txiaj ntsig ntawm ob qhov sib xyaw ya tshauv thiab ntxhia hmoov hauv mortar qhuav ntawm kev ua haujlwm thiab cov khoom siv ntawm cov tshuaj khib nyiab, thiab pom tias qhov sib ntxiv ntawm ob qhov sib xyaw tsis tsuas yog txhim kho kev ua haujlwm thiab cov khoom siv kho tshuab. ntawm qhov sib tov. Lub cev thiab cov khoom siv kho tshuab kuj tuaj yeem txo tus nqi zoo. Qhov pom zoo kom noj ntau npaum li cas yog hloov 20% ntawm ya tshauv thiab ntxhia hmoov raws li qhov sib piv ntawm mortar rau xuab zeb yog 1: 3, thiab qhov sib piv ntawm cov dej rau cov khoom yog 0.16.
Zhuang Zihao los ntawm South Tuam Tshoj University of Technology kho cov dej-binder piv, hloov kho bentonite, cellulose ether thiab roj hmab hmoov, thiab kawm txog cov khoom ntawm mortar zog, dej tuav thiab qhuav shrinkage ntawm peb ntxhia admixtures, thiab pom tias cov ntsiab lus admixture mus txog. Ntawm 50%, qhov porosity nce ntxiv thiab lub zog txo qis, thiab qhov kev pom zoo ntawm peb cov ntxhia sib xyaw yog 8% limestone hmoov, 30% slag, thiab 4% ya tshauv, uas tuaj yeem ua tiav dej tuav. tus nqi, tus nqi nyiam ntawm kev siv.
Li Ying los ntawm Qinghai University tau ua ib qho kev sim ntawm mortar tov nrog ntxhia admixtures, thiab xaus lus thiab soj ntsuam tias cov ntxhia admixtures tuaj yeem ua kom zoo dua qhov kev ua kom zoo dua qub ntawm cov hmoov, thiab cov nyhuv micro-filling thiab ob qho tib si hydration ntawm admixtures tuaj yeem ua rau qee yam, lub compactness ntawm lub mortar yog nce, yog li ua kom nws lub zog.
Zhao Yujing ntawm Shanghai Baosteel Tshiab Tsev Khoom Co., Ltd. siv txoj kev xav ntawm pob txha toughness thiab puas lub zog los kawm txog cov ntxhia hauv cov khoom sib xyaw ntawm brittleness ntawm pob zeb. Qhov kev ntsuam xyuas qhia tau hais tias cov ntxhia sib tov tuaj yeem txhim kho cov pob txha toughness thiab tawg lub zog ntawm mortar; nyob rau hauv cov ntaub ntawv ntawm tib hom admixture, qhov hloov pauv ntawm 40% ntawm cov ntxhia ntxhia admixture yog qhov zoo tshaj plaws rau cov pob txha toughness thiab tawg zog.
Xu Guangsheng ntawm Henan University tau taw qhia tias thaum thaj chaw tshwj xeeb ntawm cov hmoov ntxhia hmoov tsawg dua E350m2 / l [g, kev ua haujlwm tsawg, 3d lub zog tsuas yog kwv yees li 30%, thiab 28d lub zog loj hlob mus rau 0 ~ 90% ; thaum nyob ntawm 400m2 melon g, lub zog 3d Nws tuaj yeem nyob ze rau 50%, thiab lub zog 28d yog siab dua 95%. Los ntawm qhov kev xav ntawm cov hauv paus ntsiab lus ntawm rheology, raws li kev soj ntsuam ntawm mortar fluidity thiab flow velocity, ob peb cov lus xaus tau kos: ya tshauv cov ntsiab lus hauv qab no 20% tuaj yeem txhim kho mortar fluidity thiab ntws nrawm, thiab cov hmoov ntxhia hauv cov tshuaj hauv qab no. 25%, fluidity ntawm mortar tuaj yeem nce ntxiv tab sis tus nqi ntws tau txo.
Xib fwb Wang Dongmin ntawm Tuam Tshoj University of Mining thiab Technology thiab xibfwb Feng Lufeng ntawm Shandong Jianzhu University tau taw qhia nyob rau hauv tsab xov xwm hais tias pob zeb yog peb-theem cov khoom los ntawm kev xav ntawm cov ntaub ntawv sib xyaw, uas yog cement paste, aggregate, cement paste thiab aggregate. Lub interface hloov chaw ITZ (Interfacial Transition Zone) ntawm kev sib tshuam. ITZ yog thaj chaw muaj dej nplua nuj, qhov sib piv ntawm cov dej hauv zos yog qhov loj heev, qhov porosity tom qab hydration loj, thiab nws yuav ua rau cov calcium hydroxide enrichment. Cov cheeb tsam no feem ntau yuav ua rau muaj kev tawg thaum pib, thiab feem ntau yuav ua rau muaj kev ntxhov siab. Concentration feem ntau txiav txim siab qhov siv. Txoj kev tshawb nrhiav pom tau hais tias qhov sib ntxiv ntawm cov khoom sib xyaw tuaj yeem txhim kho cov dej endocrine hauv thaj chaw hloov pauv, txo qhov tuab ntawm thaj chaw hloov pauv, thiab txhim kho lub zog.
Zhang Jianxin ntawm Chongqing University thiab lwm tus pom tias los ntawm kev hloov kho ntawm methyl cellulose ether, polypropylene fiber, redispersible polymer hmoov, thiab admixtures, qhuav-mixed plastering mortar nrog kev ua tau zoo tuaj yeem npaj tau. Qhuav-mixed crack-resistant plastering mortar muaj kev ua haujlwm zoo, kev sib raug zoo siab thiab kev ua haujlwm tawg zoo. Qhov zoo ntawm nruas thiab tawg yog ib qho teeb meem tshwm sim.
Ren Chuanyao ntawm Zhejiang University thiab lwm tus tau kawm txog cov txiaj ntsig ntawm hydroxypropyl methylcellulose ether ntawm cov khoom ntawm ya tshauv mortar, thiab tshuaj xyuas qhov kev sib raug zoo ntawm cov ntub dej thiab lub zog compressive. Nws tau pom tias ntxiv hydroxypropyl methyl cellulose ether rau hauv cov hmoov tshauv ya ya tuaj yeem txhim kho cov dej khaws cia ntawm mortar, ua kom lub sijhawm sib txuas ntawm mortar, thiab txo qhov ntub dej thiab compressive zog ntawm mortar. Muaj kev sib raug zoo ntawm qhov ntub dej thiab 28d compressive zog. Nyob rau hauv cov xwm txheej ntawm kev paub ntub dej ntom ntom, 28d compressive zog tuaj yeem suav tau los ntawm kev siv cov qauv tsim nyog.
Xibfwb Pang Lufeng thiab Chang Qingshan ntawm Shandong Jianzhu University siv cov qauv tsim qauv los kawm txog kev cuam tshuam ntawm peb qhov sib xyaw ntawm cov hmoov tshauv ya, ntxhia hmoov thiab silica fume ntawm lub zog ntawm cov pob zeb, thiab muab tso rau hauv cov qauv kev kwv yees nrog qee qhov txiaj ntsig los ntawm kev rov qab los. tsom xam. , thiab nws practicability tau txheeb xyuas.
1.5Lub hom phiaj thiab qhov tseem ceeb ntawm txoj kev tshawb no
Raws li ib qho tseem ceeb ntawm cov dej-retaining thickener, cellulose ether yog siv dav hauv kev ua zaub mov, tshuaj khib thiab pob zeb ntau lawm thiab lwm yam lag luam. Raws li ib qho tseem ceeb admixture nyob rau hauv ntau yam mortars, ntau yam cellulose ethers yuav txo tau cov ntshav los ntawm high fluidity mortar, txhim khu lub thixotropy thiab kev tsim smoothness ntawm lub mortar, thiab txhim kho cov dej tuav kev ua tau zoo thiab daim ntawv cog lus lub zog ntawm lub mortar.
Daim ntawv thov ntawm cov ntxhia admixtures yog nce zuj zus, uas tsis tsuas yog daws qhov teeb meem ntawm kev ua lag luam ntau ntawm cov khoom lag luam, txuag av thiab tiv thaiv ib puag ncig, tab sis kuj tuaj yeem hloov pov tseg rau hauv cov khoom muaj nqis thiab tsim cov txiaj ntsig.
Muaj ntau txoj kev tshawb fawb txog cov khoom ntawm ob lub mortars nyob rau hauv tsev thiab txawv teb chaws, tab sis tsis muaj ntau yam kev sim uas muab ob qho tib si ua ke. Lub hom phiaj ntawm daim ntawv no yog sib tov ob peb cellulose ethers thiab ntxhia admixtures rau hauv cov cement paste tib lub sij hawm, siab fluidity mortar thiab yas mortar (noj cov khoom sib txuas ua piv txwv), los ntawm kev tshawb nrhiav cov fluidity thiab ntau yam khoom siv, txoj cai cuam tshuam ntawm ob hom mortars thaum cov khoom sib xyaw ua ke tau sau tseg, uas yuav cuam tshuam rau yav tom ntej cellulose ether. Thiab cov ntawv thov ntxiv ntawm cov ntxhia sib xyaw ua ke muab qee yam siv.
Tsis tas li ntawd, daim ntawv no qhia txog ib txoj hauv kev los kwv yees lub zog ntawm mortar thiab pob zeb ua raws li FERET lub zog txoj kev xav thiab kev ua haujlwm coefficient ntawm cov ntxhia sib xyaw, uas tuaj yeem muab cov lus qhia tseem ceeb rau kev sib xyaw tsim thiab kev kwv yees lub zog ntawm mortar thiab pob zeb.
1.6Cov ntsiab lus tshawb fawb tseem ceeb ntawm daim ntawv no
Cov ntsiab lus tseem ceeb ntawm kev tshawb fawb no muaj xws li:
1. Los ntawm kev sib xyaw ua ke ntawm ntau lub cellulose ethers thiab ntau yam ntxhia admixtures, kev sim ntawm cov kua dej ntawm cov slurry huv si thiab cov kua nplaum uas muaj kuab heev tau ua tiav, thiab cov kev cai cuam tshuam tau sau tseg thiab cov laj thawj raug tshuaj xyuas.
2. Los ntawm kev ntxiv cellulose ethers thiab ntau yam ntxhia admixtures rau high fluidity mortar thiab bonding mortar, tshawb lawv cov teebmeem ntawm compressive zog, flexural zog, compression-folding ratio thiab bonding mortar ntawm high fluidity mortar thiab yas mortar Txoj cai ntawm lub zog ntawm tensile daim ntawv cog lus zog.
3. Ua ke nrog FERET lub zog txoj kev xav thiab kev ua haujlwm coefficient ntawm cov ntxhia sib xyaw, ib txoj kev kwv yees lub zog rau ntau cov khoom siv cementitious mortar thiab pob zeb yog npaj.
Tshooj 2 Kev tshuaj xyuas cov khoom siv raw thiab lawv cov khoom siv rau kev sim
2.1 Cov ntaub ntawv xeem
2.1.1 Cement (C)
Qhov kev sim siv "Shanshui Dongyue" hom PO. 42.5 Cement ib.
2.1.2 Mineral hmoov (KF)
$ 95 qib granulated blast furnace slag hmoov los ntawm Shandong Jinan Luxin New Building Materials Co., Ltd.
2.1.3 Fly Ash (FA)
Qib II ya tshauv tsim los ntawm Jinan Huangtai Fais Fab Cog yog xaiv, qhov zoo (tseem sieve ntawm 459m square qhov sieve) yog 13%, thiab cov dej xav tau piv yog 96%.
2.1.4 Silica fume (sF)
Silica fume txais cov silica fume ntawm Shanghai Aika Silica Fume Material Co., Ltd., nws qhov ceev yog 2.59 / cm3; Qhov tshwj xeeb thaj chaw yog 17500m2 / kg, thiab qhov nruab nrab particle loj yog O. 1 ~ 0.39m, 28d kev ua index yog 108%, dej xav tau piv yog 120%.
2.1.5 Redispersible latex hmoov (JF)
Cov roj hmab hmoov siv Max redispersible latex hmoov 6070N (hom kev sib txuas) los ntawm Gomez Chemical China Co., Ltd.
2.1.6 Cellulose Ether (CE)
CMC txais txheej txheej CMC los ntawm Zibo Zou Yongning Chemical Co., Ltd., thiab HPMC txais ob hom hydroxypropyl methylcellulose los ntawm Gomez Chemical Tuam Tshoj Co., Ltd.
2.1.7 Lwm cov khoom xyaw
Hnyav calcium carbonate, ntoo fiber ntau, dej tiv thaiv, calcium formate, thiab lwm yam.
2.1,8 quartz xuab zeb
Lub tshuab ua quartz xuab zeb txais plaub yam zoo: 10-20 mesh, 20-40 H, 40.70 mesh thiab 70.140 H, qhov ceev yog 2650 kg / rn3, thiab pawg combustion yog 1620 kg / m3.
2.1.9 Polycarboxylate superplasticizer hmoov (PC)
Cov hmoov polycarboxylate ntawm Suzhou Xingbang Chemical Building Materials Co., Ltd.) yog 1J1030, thiab cov dej txo qis yog 30%.
2.1.10 Xuab zeb (S)
Cov xuab zeb nruab nrab ntawm Dawen River hauv Tai'an yog siv.
2.1.11 Coarse aggregate (G)
Siv Jinan Ganggou los tsim 5 "~ 25 crushed pob zeb.
2.2 Test method
2.2.1 Test method for slurry fluidity
Cov khoom siv kuaj: NJ. 160 hom cement slurry tov khoom, tsim los ntawm Wuxi Jianyi Instrument Machinery Co., Ltd.
Cov qauv kev xeem thiab cov txiaj ntsig tau suav nrog raws li txoj hauv kev sim rau qhov fluidity ntawm cement paste hauv Appendix A ntawm "GB 50119.2003 Technical Specifications for the Application of Concrete Admixtures" los yog ((GB/T8077--2000 Test Method for Homogeneousness of Concrete Admixtures) ).
2.2.2 Test method for fluidity of high fluidity mortar
Cov khoom siv kuaj: JJ. Hom 5 cement mortar tov khoom, tsim los ntawm Wuxi Jianyi Instrument Machinery Co., Ltd.;
TYE-2000B mortar compression kuaj tshuab, tsim los ntawm Wuxi Jianyi Instrument Machinery Co., Ltd.;
TYE-300B mortar dabtsi yog khoov kuaj tshuab, tsim los ntawm Wuxi Jianyi Instrument Machinery Co., Ltd.
Mortar fluidity detection method yog raws li "JC. T 986-2005 Cement-based grouting materials" thiab "GB 50119-2003 Technical Specifications for the Application of Concrete Admixtures" Appendix A, qhov loj ntawm lub khob hliav qab siv, qhov siab yog 60mm , sab hauv txoj kab uas hla ntawm qhov chaw nres nkoj sab saud yog 70 hli, sab hauv txoj kab uas hla ntawm qhov chaw nres nkoj qis yog 100 hli, thiab sab nraud ntawm qhov chaw nres nkoj qis yog 120 hli, thiab tag nrho qhov hnyav ntawm cov mortar yuav tsum tsis pub tsawg tshaj 2000g txhua zaus.
Qhov kev ntsuam xyuas ntawm ob lub fluidities yuav tsum coj tus nqi nruab nrab ntawm ob txoj kab ntsug raws li qhov kawg tshwm sim.
2.2.3 Test method for tensile bond strength of bonded mortar
Cov cuab yeej xeem tseem ceeb: WDL. Hom 5 hluav taws xob universal kuaj tshuab, tsim los ntawm Tianjin Gangyuan Instrument Factory.
Txoj kev sim rau tensile daim ntawv cog lus yuav tsum tau muab coj los siv nrog rau Tshooj 10 ntawm (JGJ/T70.2009 Standard for Test Methods for Basic Properties of Building Mortars.
Tshooj 3. Cov txiaj ntsig ntawm cellulose ether ntawm cov tshuaj dawb huv thiab tshuaj khib ntawm binary cementitious cov khoom ntawm ntau cov ntxhia sib xyaw
Liquidity Impact
Tshooj lus no tshawb txog ntau lub cellulose ethers thiab ntxhia sib xyaw los ntawm kev sim ntau ntau ntawm ntau qib ntshiab cement-based slurries thiab mortars thiab binary cementitious system slurries thiab mortars nrog ntau cov ntxhia ntxhia thiab lawv cov fluidity thiab poob lub sijhawm. Txoj cai cuam tshuam ntawm kev siv cov khoom siv ntawm cov dej ntws ntawm cov slurry huv thiab mortar, thiab cov kev cuam tshuam ntawm ntau yam yog suav nrog thiab txheeb xyuas.
3.1 Cov ntsiab lus ntawm kev sim raws tu qauv
Raws li kev cuam tshuam ntawm cellulose ether ntawm kev ua haujlwm ntawm cov cement ntshiab thiab ntau yam khoom siv cementitious, peb feem ntau kawm hauv ob hom:
1. kuab. Nws muaj qhov zoo ntawm kev xav, kev ua haujlwm yooj yim thiab raug siab, thiab yog qhov tsim nyog tshaj plaws rau kev tshawb nrhiav kev hloov pauv ntawm cov khoom siv xws li cellulose ether rau cov khoom siv gelling, thiab qhov sib txawv yog pom tseeb.
2. High fluidity mortar. Kev ua tiav lub xeev siab ntws kuj yog rau kev yooj yim ntawm kev ntsuas thiab kev soj ntsuam. Ntawm no, qhov kev hloov pauv ntawm cov ntaub ntawv ntws hauv xeev feem ntau yog tswj los ntawm kev ua haujlwm siab superplasticizers. Yuav kom txo tau qhov kev xeem yuam kev, peb siv polycarboxylate dej reducer nrog dav adaptability rau cement, uas yog rhiab heev rau qhov kub thiab txias, thiab qhov ntsuas kub yuav tsum tau tswj nruj me ntsis.
3.2 Kev ntsuas ntsuas ntawm cellulose ether ntawm fluidity ntawm ntshiab cement paste
3.2.1 Cov tswv yim sim rau cov nyhuv ntawm cellulose ether ntawm fluidity ntawm ntshiab cement paste
Lub hom phiaj ntawm kev cuam tshuam ntawm cellulose ether ntawm lub fluidity ntawm cov ntshiab slurry, cov ntshiab cement slurry ntawm ib qho khoom siv cementitious system yog thawj zaug siv los soj ntsuam cov cawv. Lub ntsiab siv ntsuas ntawm no txais yuav qhov kev paub ntau tshaj plaws hauv kev tshawb nrhiav fluidity.
Cov hauv qab no yog suav tias yog cuam tshuam rau kev txav mus los:
1. Hom cellulose ethers
2. Cellulose ether cov ntsiab lus
3. Lub sijhawm so slurry
Ntawm no, peb kho cov ntsiab lus PC ntawm cov hmoov ntawm 0.2%. Peb pawg thiab plaub pawg kev xeem tau siv rau peb hom cellulose ethers (carboxymethylcellulose sodium CMC, hydroxypropyl methylcellulose HPMC). Rau sodium carboxymethyl cellulose CMC, qhov ntau npaum li cas ntawm 0%, O. 10%, O. 2%, namely Og, 0.39, 0.69 (tus nqi ntawm cov cement hauv txhua qhov kev sim yog 3009). , rau hydroxypropyl methyl cellulose ether, qhov ntau npaum yog 0%, O. 05%, O. 10%, O. 15%, uas yog 09, 0.159, 0.39, 0.459.
3.2.2 Cov txiaj ntsig thiab kev tshuaj xyuas ntawm cov txiaj ntsig ntawm cellulose ether ntawm cov kua dej ntshiab ntawm cov cement paste
(1) Cov txiaj ntsig kev ntsuas dej ntawm cov cement ntshiab tov nrog CMC
Kev ntsuam xyuas cov txiaj ntsig kev xeem:
1. Mobility taw qhia:
Muab piv rau peb pawg nrog tib lub sijhawm sawv ntsug, nyob rau hauv cov nqe lus ntawm qhov pib fluidity, nrog rau qhov sib ntxiv ntawm CMC, qhov pib fluidity poob me ntsis; ib nrab-teev fluidity poob qis heev nrog rau qhov ntau npaum li cas, feem ntau vim yog ib nrab-teev fluidity ntawm pawg dawb paug. Nws yog 20 hli loj tshaj qhov pib (qhov no tej zaum yuav tshwm sim los ntawm retardation ntawm PC hmoov): -IJ, lub fluidity txo me ntsis ntawm 0.1% ntau npaum, thiab nce ntxiv ntawm 0.2% ntau npaum.
Muab piv rau peb pawg nrog tib koob tshuaj, qhov fluidity ntawm pawg dawb paug yog qhov loj tshaj plaws nyob rau hauv ib nrab ib teev, thiab txo qis hauv ib teev (qhov no tej zaum yuav yog vim qhov tseeb tias tom qab ib teev, cov cement particles tshwm ntau hydration thiab adhesion, cov txheej txheem inter-particle tau pib tsim, thiab cov slurry tshwm ntau dua); qhov fluidity ntawm C1 thiab C2 pawg tau txo qis me ntsis hauv ib nrab ib teev, qhia tias kev nqus dej ntawm CMC muaj qee yam cuam tshuam rau lub xeev; thaum nyob rau hauv cov ntsiab lus ntawm C2, muaj ib tug loj nce nyob rau hauv ib teev, qhia tau hais tias cov ntsiab lus ntawm Cov nyhuv ntawm retardation nyhuv ntawm CMC yog dominant.
2. Phenomenon piav piav qhia:
Nws tuaj yeem pom tau tias nrog kev nce ntawm cov ntsiab lus ntawm CMC, qhov tshwm sim ntawm khawb pib tshwm sim, qhia tias CMC muaj qee yam cuam tshuam rau kev nce cov viscosity ntawm cov cement paste, thiab cov huab cua-entraining nyhuv ntawm CMC ua rau tiam ntawm cua npuas.
(2) Cov txiaj ntsig kev ntsuas dej ntawm cov cement ntshiab tov nrog HPMC (viscosity 100,000)
Kev ntsuam xyuas cov txiaj ntsig kev xeem:
1. Mobility taw qhia:
Los ntawm cov kab kos ntawm cov nyhuv ntawm lub sij hawm sawv ntawm fluidity, nws yuav pom tau hais tias lub fluidity nyob rau hauv ib nrab ib teev yog loj heev piv nrog rau thawj zaug thiab ib teev, thiab nrog rau qhov nce ntawm cov ntsiab lus ntawm HPMC, tus qauv yog tsis muaj zog. Zuag qhia tag nrho, qhov poob ntawm fluidity tsis loj, qhia tau hais tias HPMC muaj cov dej ruaj khov rau cov slurry, thiab muaj qee yam cuam tshuam.
Nws tuaj yeem pom los ntawm kev soj ntsuam tias qhov fluidity tsis tshua muaj siab rau cov ntsiab lus ntawm HPMC. Hauv kev sim ntau yam, qhov loj dua cov ntsiab lus ntawm HPMC, qhov me dua qhov fluidity. Nws yog qhov yooj yim los sau cov kua nplaum lub khob los ntawm nws tus kheej nyob rau hauv tib tus nqi ntawm cov dej. Nws tuaj yeem pom tau tias tom qab ntxiv HPMC, qhov dej ntws los ntawm lub sijhawm tsis loj rau cov slurry ntshiab.
2. Phenomenon piav piav qhia:
Cov pab pawg neeg dawb paug muaj qhov tshwm sim los ntshav, thiab nws tuaj yeem pom los ntawm kev hloov pauv ntawm cov dej ntws tawm nrog cov koob tshuaj uas HPMC muaj zog tuav dej ntau dua thiab cov nyhuv thickening dua li CMC, thiab ua lub luag haujlwm tseem ceeb hauv kev tshem tawm qhov tshwm sim los ntshav. Cov npuas huab cua loj yuav tsum tsis txhob nkag siab tias yog qhov cuam tshuam ntawm huab cua nkag. Qhov tseeb, tom qab cov viscosity nce, cov huab cua sib xyaw ua ke hauv cov txheej txheem nplawm tsis tuaj yeem raug ntaus ua npuas me me vim tias cov slurry yog viscous heev.
(3) Cov txiaj ntsig kev ntsuas dej ntawm cov cement ntshiab tov nrog HPMC (viscosity ntawm 150,000)
Kev ntsuam xyuas cov txiaj ntsig kev xeem:
1. Mobility taw qhia:
Los ntawm kab kab ntawm kev cuam tshuam ntawm cov ntsiab lus ntawm HPMC (150,000) ntawm fluidity, kev cuam tshuam ntawm kev hloov ntawm cov ntsiab lus ntawm fluidity yog pom tseeb dua li ntawm 100,000 HPMC, qhia tias qhov nce ntawm viscosity ntawm HPMC yuav txo tau. lub fluidity.
Raws li kev soj ntsuam muaj kev txhawj xeeb, raws li tag nrho cov kev hloov pauv ntawm fluidity nrog lub sij hawm, ib nrab-teev retarding nyhuv ntawm HPMC (150,000) yog pom tseeb, thaum cov nyhuv ntawm -4, yog phem dua li ntawm HPMC (100,000) .
2. Phenomenon piav piav qhia:
Muaj los ntshav hauv pab pawg neeg dawb huv. Yog vim li cas rau khawb lub phaj yog vim cov dej-cement piv ntawm cov slurry hauv qab ua me me tom qab los ntshav, thiab cov slurry yog ntom thiab nyuaj rau khawb los ntawm iav phaj. Qhov sib ntxiv ntawm HPMC ua lub luag haujlwm tseem ceeb hauv kev tshem tawm qhov tshwm sim los ntshav. Nrog rau qhov nce ntawm cov ntsiab lus, ib qho me me ntawm cov npuas me me tau tshwm sim thawj zaug thiab tom qab ntawd cov npuas loj tshwm sim. Cov npuas me me feem ntau tshwm sim los ntawm ib qho laj thawj. Ib yam li ntawd, cov npuas loj yuav tsum tsis txhob nkag siab tias yog qhov cuam tshuam ntawm huab cua nkag. Qhov tseeb, tom qab cov viscosity nce, cov huab cua sib xyaw hauv cov txheej txheem nplawm yog qhov khov heev thiab tsis tuaj yeem dhau los ntawm slurry.
3.3 Kev ntsuam xyuas kev cuam tshuam ntawm cellulose ether ntawm cov kua dej ntshiab slurry ntawm ntau cov khoom siv cementitious
Tshooj lus no tsuas yog tshawb txog cov txiaj ntsig ntawm kev siv cov khoom siv sib xyaw ua ke thiab peb lub cellulose ethers (carboxymethyl cellulose sodium CMC, hydroxypropyl methyl cellulose HPMC) ntawm qhov fluidity ntawm cov tawv nqaij.
Ib yam li ntawd, peb pawg thiab plaub pawg kev xeem tau siv rau peb hom cellulose ethers (carboxymethylcellulose sodium CMC, hydroxypropyl methylcellulose HPMC). Rau sodium carboxymethyl cellulose CMC, qhov ntau npaum ntawm 0%, 0.10%, thiab 0.2%, uas yog 0g, 0.3g, thiab 0.6g (cov cement ntau npaum li cas rau txhua qhov kev sim yog 300g). Rau hydroxypropyl methylcellulose ether, qhov ntau npaum yog 0%, 0.05%, 0.10%, 0.15%, uas yog 0g, 0.15g, 0.3g, 0.45g. Cov ntsiab lus PC ntawm cov hmoov yog tswj ntawm 0.2%.
Cov hmoov tshauv thiab slag hmoov nyob rau hauv cov ntxhia admixture yog hloov los ntawm tib tus nqi ntawm kev sib xyaw ua ke, thiab cov qib sib xyaw yog 10%, 20% thiab 30%, uas yog, qhov hloov pauv yog 30g, 60g thiab 90g. Txawm li cas los xij, txiav txim siab qhov cuam tshuam ntawm kev ua haujlwm siab dua, shrinkage, thiab lub xeev, cov ntsiab lus silica fume yog tswj rau 3%, 6%, thiab 9%, uas yog, 9g, 18g, thiab 27g.
3.3.1 Cov tswv yim sim rau cov nyhuv ntawm cellulose ether ntawm cov kua dej ntawm cov ntshiab slurry ntawm binary cementitious khoom
(1) Lub tswv yim sim rau qhov fluidity ntawm binary cementitious cov ntaub ntawv sib xyaw nrog CMC thiab ntau yam ntxhia additives.
(2) Kev sim npaj rau qhov fluidity ntawm binary cementitious cov ntaub ntawv sib xyaw nrog HPMC (viscosity 100,000) thiab ntau yam ntxhia admixtures.
(3) Lub tswv yim sim rau lub fluidity ntawm binary cementitious cov ntaub ntawv tov nrog HPMC (viscosity ntawm 150,000) thiab ntau yam ntxhia admixtures.
3.3.2 Kev ntsuam xyuas thiab kev soj ntsuam ntawm cov nyhuv ntawm cellulose ether ntawm fluidity ntawm ntau cov khoom cementitious
(1) Qhov kev ntsuam xyuas thawj zaug ntawm cov khoom siv cementitious binary ntshiab slurry tov nrog CMC thiab ntau yam ntxhia admixtures.
Nws tuaj yeem pom los ntawm qhov no tias qhov sib ntxiv ntawm yoov tshauv tuaj yeem ua rau muaj txiaj ntsig zoo rau thawj zaug fluidity ntawm slurry, thiab nws zoo li nthuav dav nrog qhov nce ntawm ya tshauv cov ntsiab lus. Nyob rau tib lub sijhawm, thaum cov ntsiab lus ntawm CMC nce, qhov fluidity txo me ntsis, thiab qhov siab tshaj plaws txo yog 20mm.
Nws tuaj yeem pom tau tias qhov pib fluidity ntawm cov ntshiab slurry tuaj yeem nce ntxiv ntawm qhov tsawg ntawm cov hmoov ntxhia hmoov, thiab kev txhim kho ntawm fluidity tsis pom tseeb thaum qhov ntau npaum li 20%. Nyob rau tib lub sijhawm, tus nqi ntawm CMC hauv O. Ntawm 1%, fluidity yog qhov siab tshaj plaws.
Nws tuaj yeem pom los ntawm qhov no tias cov ntsiab lus ntawm silica fume feem ntau muaj qhov cuam tshuam tsis zoo rau qhov pib fluidity ntawm slurry. Nyob rau tib lub sijhawm, CMC kuj txo qis qhov fluidity me ntsis.
Ib nrab-teev fluidity xeem tau los ntawm cov ntshiab binary cementitious cov ntaub ntawv tov nrog CMC thiab ntau yam ntxhia admixtures.
Nws tuaj yeem pom tau tias qhov kev txhim kho ntawm cov fluidity ntawm ya tshauv rau ib nrab ib teev yog qhov zoo ntawm kev siv tsawg, tab sis nws kuj yuav yog vim nws nyob ze rau qhov kev txwv ntawm cov ntshiab slurry. Tib lub sijhawm, CMC tseem muaj qhov txo qis hauv fluidity.
Tsis tas li ntawd, muab piv rau qhov pib thiab ib nrab-teev fluidity, nws tuaj yeem pom tias cov hmoov tshauv yoov tshaj cum muaj txiaj ntsig zoo los tswj qhov poob ntawm fluidity lub sijhawm.
Nws tuaj yeem pom los ntawm qhov no tias tag nrho cov hmoov ntxhia hmoov tsis muaj qhov pom tseeb tsis zoo ntawm cov kua dej ntshiab slurry rau ib nrab ib teev, thiab qhov tsis tu ncua tsis muaj zog. Nyob rau tib lub sijhawm, cov txiaj ntsig ntawm CMC cov ntsiab lus ntawm fluidity hauv ib nrab ib teev tsis pom tseeb, tab sis kev txhim kho ntawm 20% ntxhia hmoov hloov pawg yog qhov pom tseeb.
Nws tuaj yeem pom tias qhov cuam tshuam tsis zoo ntawm cov dej ntshiab ntawm cov slurry ntshiab nrog cov nyiaj ntawm silica fume rau ib nrab ib teev yog pom tseeb dua li qhov pib, tshwj xeeb tshaj yog cov nyhuv hauv thaj tsam ntawm 6% mus rau 9% yog pom tseeb dua. Nyob rau tib lub sijhawm, qhov txo qis ntawm CMC cov ntsiab lus ntawm qhov fluidity yog li 30 hli, uas yog ntau dua li qhov txo qis ntawm CMC cov ntsiab lus mus rau qhov pib.
(2) Qhov kev ntsuam xyuas thawj zaug ntawm cov khoom siv cementitious binary ntshiab slurry tov nrog HPMC (viscosity 100,000) thiab ntau yam ntxhia admixtures
Los ntawm qhov no, nws tuaj yeem pom tau tias cov nyhuv ntawm ya tshauv ntawm fluidity yog qhov pom tseeb, tab sis nws pom nyob rau hauv qhov kev ntsuam xyuas tias ya tshauv tsis muaj qhov pom tseeb txhim kho los ntshav. Tsis tas li ntawd, qhov txo cov nyhuv ntawm HPMC ntawm cov kua dej yog pom tseeb heev (tshwj xeeb tshaj yog nyob rau hauv thaj tsam ntawm 0.1% mus rau 0.15% ntawm kev siv ntau, qhov siab tshaj plaws txo tuaj yeem ncav cuag ntau dua 50mm).
Nws tuaj yeem pom tau tias cov hmoov ntxhia muaj qhov cuam tshuam me ntsis ntawm cov kua dej, thiab tsis ua kom cov ntshav zoo. Tsis tas li ntawd, qhov txo cov nyhuv ntawm HPMC ntawm fluidity nce mus txog 60mm nyob rau hauv qhov ntau ntawm 0.1% ~ 0.15% ntawm ntau npaum.
Los ntawm qhov no, nws tuaj yeem pom tias qhov txo qis ntawm fluidity ntawm silica fume yog pom tseeb dua nyob rau hauv qhov ntau npaum li cas, thiab ntxiv rau, silica fume muaj kev txhim kho pom tseeb ntawm cov ntshav hauv qhov kev sim. Nyob rau tib lub sijhawm, HPMC muaj cov txiaj ntsig pom tseeb ntawm kev txo cov kua dej (tshwj xeeb tshaj yog nyob rau hauv ntau qhov ntau npaum li cas (0.1% txog 0.15%).Raws li qhov cuam tshuam ntawm fluidity, silica fume thiab HPMC ua lub luag haujlwm tseem ceeb, thiab Lwm yam Cov tshuaj nplaum ua raws li kev pabcuam me me.
Nws tuaj yeem pom tau tias, feem ntau, cov txiaj ntsig ntawm peb qhov sib xyaw ua ke ntawm qhov fluidity zoo ib yam li tus nqi pib. Thaum cov silica fume nyob rau ntawm cov ntsiab lus siab ntawm 9% thiab cov ntsiab lus HPMC yog O. Nyob rau hauv rooj plaub ntawm 15%, qhov tshwm sim uas cov ntaub ntawv tsis tuaj yeem sau tau vim lub xeev tsis zoo ntawm cov slurry yog qhov nyuaj rau sau lub khob hliav qab pwm. , qhia tau hais tias viscosity ntawm silica fume thiab HPMC tau nce ntau ntawm ntau npaum li cas. Piv nrog CMC, qhov viscosity nce nyhuv ntawm HPMC yog qhov pom tseeb heev.
(3) Qhov kev ntsuam xyuas thawj zaug ntawm cov khoom siv cementitious binary ntshiab slurry tov nrog HPMC (viscosity 100,000) thiab ntau yam ntxhia admixtures
Los ntawm qhov no, nws tuaj yeem pom tias HPMC (150,000) thiab HPMC (100,000) muaj qhov cuam tshuam zoo sib xws ntawm cov slurry, tab sis HPMC nrog cov viscosity siab muaj qhov txo qis me ntsis hauv fluidity, tab sis nws tsis pom tseeb, uas yuav tsum muaj feem cuam tshuam nrog kev sib cais. ntawm HPMC. Qhov ceev muaj ib qho kev sib raug zoo. Ntawm cov admixtures, cov nyhuv ntawm ya tshauv cov ntsiab lus ntawm fluidity ntawm slurry yog ib qho yooj yim linear thiab zoo, thiab 30% ntawm cov ntsiab lus yuav ua rau kom lub fluidity los ntawm 20,-,30mm; Cov nyhuv tsis pom tseeb, thiab nws txoj kev txhim kho ntawm cov ntshav yog txwv; Txawm tias nyob rau theem me me ntawm tsawg dua 10%, silica fume muaj qhov pom tseeb heev ntawm kev txo cov ntshav, thiab nws qhov chaw tshwj xeeb yog ze li ob npaug ntau dua li cov cement. kev txiav txim ntawm qhov loj, cov nyhuv ntawm nws cov adsorption ntawm cov dej ntawm kev txav mus los yog qhov tseem ceeb heev.
Nyob rau hauv ib lo lus, nyob rau hauv qhov sib txawv ntawm qhov ntau npaum li cas, yam cuam tshuam rau lub fluidity ntawm slurry, qhov ntau npaum ntawm silica fume thiab HPMC yog qhov tseem ceeb tshaj plaws, txawm tias nws yog kev tswj ntshav los yog kev tswj ntawm lub xeev ntws, nws yog. pom tseeb dua, lwm yam Cov nyhuv ntawm admixtures yog theem nrab thiab plays lub luag haujlwm hloov kho.
Qhov thib peb qhia txog kev cuam tshuam ntawm HPMC (150,000) thiab cov khoom sib xyaw ntawm cov kua dej ntshiab hauv ib nrab teev, uas feem ntau zoo ib yam li txoj cai ntawm tus nqi pib. Nws tuaj yeem pom tias qhov nce ntawm ya tshauv ntawm cov kua dej ntshiab ntawm cov slurry rau ib nrab ib teev yog qhov pom tseeb me ntsis tshaj qhov nce ntawm qhov pib fluidity, lub zog ntawm cov hmoov slag tseem tsis pom tseeb, thiab cov ntsiab lus ntawm silica fume ntawm fluidity. tseem pom tseeb heev. Tsis tas li ntawd, hais txog cov ntsiab lus ntawm HPMC, muaj ntau qhov tshwm sim uas tsis tuaj yeem nchuav tawm ntawm cov ntsiab lus siab, qhia tias nws cov O. 15% ntau npaum li cas muaj txiaj ntsig zoo rau kev nce viscosity thiab txo cov fluidity, thiab nyob rau hauv cov nqe lus ntawm fluidity rau ib nrab. ib teev, piv nrog tus nqi pib, cov slag pab pawg O. Qhov fluidity ntawm 05% HPMC txo qis dua.
Nyob rau hauv cov nqe lus ntawm qhov poob ntawm fluidity nyob rau lub sij hawm, kev koom ua ke ntawm silica fume muaj qhov cuam tshuam loj heev rau nws, feem ntau vim tias silica fume muaj qhov loj, kev ua haujlwm siab, cov tshuaj tiv thaiv sai, thiab muaj peev xwm nqus dej noo, ua rau muaj kev cuam tshuam loj heev. fluidity rau lub sijhawm sawv. Rau.
3.4 Kev sim ntawm cov nyhuv ntawm cellulose ether ntawm fluidity ntawm cov cement-based high-fluidity mortar
3.4.1 Cov tswv yim sim rau cov nyhuv ntawm cellulose ether ntawm cov kua dej ntawm cov cement-based high-fluidity mortar
Siv cov tshuaj khib nyiab siab kom pom nws cov txiaj ntsig ntawm kev ua haujlwm. Lub ntsiab lus qhia ntawm no yog thawj zaug thiab ib nrab-teev mortar fluidity test.
Cov hauv qab no yog suav tias yog cuam tshuam rau kev txav mus los:
1 hom cellulose ethers,
2 Kev noj cov cellulose ether,
3 Lub sij hawm sawv ntsug
3.4.2 Cov txiaj ntsig thiab kev tshuaj xyuas ntawm cov txiaj ntsig ntawm cellulose ether ntawm cov kua dej ntawm cov cement-based high-fluidity mortar
(1) Fluidity xeem tau ntawm cov cement mortar tov nrog CMC
Summary and analysis of test results:
1. Mobility taw qhia:
Muab piv rau peb pawg nrog tib lub sijhawm sawv ntsug, nyob rau hauv cov nqe lus ntawm qhov pib fluidity, nrog rau qhov sib ntxiv ntawm CMC, qhov pib fluidity poob me ntsis, thiab thaum cov ntsiab lus mus txog O. Ntawm 15%, muaj qhov pom tseeb txo qis; qhov txo qis ntawm qhov fluidity nrog qhov nce ntawm cov ntsiab lus hauv ib nrab teev yog zoo ib yam li tus nqi pib.
2. Cov tsos mob:
Kev hais lus theoretical, piv nrog cov slurry huv si, kev koom ua ke ntawm cov khoom sib xyaw hauv mortar ua rau nws yooj yim dua rau huab cua npuas kom nkag mus rau hauv slurry, thiab cov nyhuv thaiv ntawm aggregates ntawm los ntshav voids kuj yuav ua rau nws yooj yim rau huab cua npuas lossis los ntshav kom khaws cia. Nyob rau hauv lub slurry, yog li ntawd, cov huab cua npuas cov ntsiab lus thiab qhov loj ntawm lub mortar yuav tsum ntau thiab loj dua li cov slurry zoo. Ntawm qhov tod tes, nws tuaj yeem pom tau tias nrog kev nce ntawm cov ntsiab lus ntawm CMC, qhov fluidity txo qis, qhia tias CMC muaj qee yam thickening nyhuv ntawm mortar, thiab ib nrab-teev fluidity test qhia tau hais tias cov npuas dej ntws tawm ntawm qhov chaw. nce me ntsis. , uas kuj yog ib qho kev tshwm sim ntawm qhov nce sib xws, thiab thaum qhov sib xws nce mus txog ib theem, cov npuas yuav nyuaj dhau, thiab tsis muaj npuas pom tseeb yuav pom ntawm qhov chaw.
(2) Cov txiaj ntsig kev ntsuas dej ntawm cov cement mortar tov nrog HPMC (100,000)
Kev ntsuam xyuas cov txiaj ntsig kev xeem:
1. Mobility taw qhia:
Nws tuaj yeem pom los ntawm daim duab uas nrog qhov nce ntawm cov ntsiab lus ntawm HPMC, qhov fluidity tau txo qis heev. Piv nrog CMC, HPMC muaj cov nyhuv thickening. Cov nyhuv thiab dej tuav tau zoo dua. Los ntawm 0.05% mus rau 0.1%, qhov ntau ntawm fluidity hloov yog pom tseeb dua, thiab los ntawm O. Tom qab 1%, tsis yog thawj zaug lossis ib nrab teev hloov pauv hauv fluidity loj dhau.
2. Phenomenon piav piav qhia:
Nws tuaj yeem pom los ntawm lub rooj thiab daim duab tias tsis muaj cov npuas hauv ob pawg ntawm Mh2 thiab Mh3, qhia tau hais tias cov viscosity ntawm ob pawg twb kuj loj heev, tiv thaiv cov npuas npuas hauv slurry.
(3) Cov txiaj ntsig kev ntsuas dej ntawm cov cement mortar tov nrog HPMC (150,000)
Kev ntsuam xyuas cov txiaj ntsig kev xeem:
1. Mobility taw qhia:
Muab piv rau ob peb pawg nrog tib lub sijhawm sawv ntsug, qhov kev sib txawv yog tias ob qho tib si thawj zaug thiab ib nrab-teev fluidity txo nrog qhov nce ntawm cov ntsiab lus ntawm HPMC, thiab qhov txo qis yog pom tseeb dua li ntawm HPMC nrog viscosity ntawm 100,000, qhia tias qhov nce ntawm viscosity ntawm HPMC ua rau nws nce. Cov nyhuv thickening muaj zog, tab sis nyob rau hauv O. Cov nyhuv ntawm qhov ntau npaum li cas hauv qab no 05% yog tsis pom tseeb, lub fluidity muaj ib tug kuj loj kev hloov nyob rau hauv qhov ntau ntawm 0.05% mus rau 0.1%, thiab cov qauv yog dua nyob rau hauv ntau ntawm 0.1%. mus txog 0.15%. Ua qeeb qeeb, lossis tseem nres hloov. Muab piv rau ib nrab-teev fluidity poob qhov tseem ceeb (pib fluidity thiab ib nrab-teev fluidity) ntawm HPMC nrog ob viscosities, nws tuaj yeem pom tias HPMC nrog cov viscosity siab tuaj yeem txo tus nqi poob, qhia tias nws cov dej tuav thiab teeb tsa cov nyhuv retardation yog. zoo tshaj qhov uas tsis muaj viscosity.
2. Phenomenon piav piav qhia:
Hais txog kev tswj cov ntshav, ob lub HPMCs muaj qhov sib txawv me ntsis, ob qho tib si tuaj yeem khaws cov dej thiab ua kom tuab, tshem tawm cov kev tsis zoo los ntawm kev los ntshav, thiab tib lub sij hawm cia cov npuas dej ntws zoo.
3.5 Kev sim ntawm cov nyhuv ntawm cellulose ether ntawm fluidity ntawm high fluidity mortar ntawm ntau yam cementitious cov ntaub ntawv systems
3.5.1 Cov tswv yim sim rau cov nyhuv ntawm cellulose ethers ntawm fluidity ntawm high-fluidity mortars ntawm ntau yam khoom siv cementitious
High fluidity mortar tseem siv los saib xyuas nws cov kev cuam tshuam ntawm fluidity. Cov cim qhia tseem ceeb yog qhov pib thiab ib nrab-teev mortar fluidity nrhiav kom pom.
(1) Kev sim cov txheej txheem ntawm mortar fluidity nrog binary cementitious cov ntaub ntawv sib xyaw nrog CMC thiab ntau yam ntxhia admixtures
(2) Kev sim cov txheej txheem ntawm mortar fluidity nrog HPMC (viscosity 100,000) thiab binary cementitious cov ntaub ntawv ntawm ntau yam ntxhia admixtures
(3) Kev sim cov txheej txheem ntawm mortar fluidity nrog HPMC (viscosity 150,000) thiab binary cementitious cov ntaub ntawv ntawm ntau yam ntxhia admixtures
3.5.2 Cov txiaj ntsig ntawm cellulose ether ntawm cov kua dej ntawm cov kua qaub siab hauv cov khoom siv cementitious binary ntawm ntau cov ntxhia hauv cov khoom siv tshuaj ntsuam xyuas thiab tshuaj xyuas
(1) Cov txiaj ntsig ntawm qhov pib fluidity xeem ntawm binary cementitious mortar tov nrog CMC thiab ntau yam admixtures
Los ntawm cov txiaj ntsig ntawm kev ntsuas thawj zaug, nws tuaj yeem xaus lus tias qhov sib ntxiv ntawm cov hmoov tshauv ya tuaj yeem txhim kho me ntsis fluidity ntawm mortar; thaum cov ntsiab lus ntawm cov ntxhia hmoov yog 10%, qhov fluidity ntawm mortar tuaj yeem txhim kho me ntsis; thiab silica fume muaj kev cuam tshuam ntau dua ntawm fluidity, tshwj xeeb tshaj yog nyob rau hauv thaj tsam ntawm 6% ~ 9% cov ntsiab lus sib txawv, ua rau txo qis ntawm fluidity ntawm 90mm.
Nyob rau hauv ob pawg ntawm ya tshauv thiab ntxhia hmoov, CMC txo qhov fluidity ntawm mortar rau ib qho twg, thaum nyob rau hauv silica fume pawg, O. Qhov nce ntawm CMC cov ntsiab lus saum toj no 1% tsis cuam tshuam rau fluidity ntawm mortar.
Ib nrab-teev fluidity xeem tau los ntawm binary cementitious mortar tov nrog CMC thiab ntau yam admixtures
Los ntawm qhov kev ntsuam xyuas ntawm cov fluidity nyob rau hauv ib nrab ib teev, nws tuaj yeem txiav txim siab tias cov nyhuv ntawm cov ntsiab lus ntawm admixture thiab CMC zoo ib yam li thawj zaug, tab sis cov ntsiab lus ntawm CMC nyob rau hauv cov ntxhia hmoov hmoov hloov los ntawm O. 1% mus rau O. Qhov hloov 2% yog loj dua, ntawm 30mm.
Nyob rau hauv cov nqe lus ntawm qhov poob ntawm fluidity nyob rau lub sij hawm, ya tshauv muaj cov nyhuv ntawm kev txo qhov poob, thaum cov ntxhia hmoov thiab silica fume yuav ua rau kom poob nqi nyob rau hauv siab npaum li cas. 9% ntau npaum li cas ntawm silica fume kuj ua rau cov pwm kuaj tsis tau sau los ntawm nws tus kheej. , fluidity tsis tuaj yeem ntsuas qhov tseeb.
(2) Qhov kev ntsuam xyuas thawj zaug ntawm binary cementitious mortar tov nrog HPMC (viscosity 100,000) thiab ntau yam admixtures
Ib nrab-teev fluidity xeem tau los ntawm binary cementitious mortar tov nrog HPMC (viscosity 100,000) thiab ntau yam admixtures
Nws tseem tuaj yeem txiav txim siab los ntawm kev sim uas qhov sib ntxiv ntawm cov tshauv ya tuaj yeem txhim kho cov kua dej ntawm cov mortar me ntsis; thaum cov ntsiab lus ntawm cov ntxhia hmoov yog 10%, qhov fluidity ntawm mortar tuaj yeem txhim kho me ntsis; Qhov ntau npaum li cas yog qhov rhiab heev, thiab cov pab pawg HPMC nrog ntau npaum li cas ntawm 9% muaj cov pob txha tuag, thiab cov dej ntws tau ploj mus.
Cov ntsiab lus ntawm cellulose ether thiab silica fume kuj yog qhov pom tseeb tshaj plaws cuam tshuam rau cov dej ntawm cov tshuaj khib nyiab. Cov txiaj ntsig ntawm HPMC yog qhov tseeb ntau dua li ntawm CMC. Lwm cov khoom xyaw tuaj yeem txhim kho qhov poob ntawm fluidity nyob rau lub sijhawm.
(3) Qhov kev ntsuam xyuas thawj zaug ntawm binary cementitious mortar tov nrog HPMC (viscosity ntawm 150,000) thiab ntau yam admixtures
Ib nrab-teev fluidity xeem tau los ntawm binary cementitious mortar tov nrog HPMC (viscosity 150,000) thiab ntau yam admixtures
Nws tseem tuaj yeem txiav txim siab los ntawm kev sim uas qhov sib ntxiv ntawm cov tshauv ya tuaj yeem txhim kho cov kua dej ntawm cov mortar me ntsis; Thaum cov ntsiab lus ntawm cov hmoov ntxhia yog 10%, qhov fluidity ntawm mortar tuaj yeem txhim kho me ntsis: silica fume tseem zoo heev los daws qhov tshwm sim los ntshav, thaum Fluidity yog ib qho kev mob tshwm sim loj, tab sis tsis zoo dua li nws cov nyhuv hauv cov slurries huv. .
Ntau qhov chaw tuag tau tshwm sim nyob rau hauv cov ntsiab lus siab ntawm cellulose ether (tshwj xeeb tshaj yog nyob rau hauv lub rooj ntawm ib nrab-teev fluidity), qhia tias HPMC muaj kev cuam tshuam tseem ceeb ntawm kev txo cov kua dej ntawm cov tshuaj khib nyiab, thiab cov hmoov ntxhia thiab cov hmoov tshauv tuaj yeem txhim kho qhov poob. ntawm fluidity nyob rau lub sijhawm.
3.5 Tshooj Summary
1. Kev sib piv qhov kev ntsuas fluidity ntawm ntshiab cement paste tov nrog peb cellulose ethers, nws tuaj yeem pom tias
1. CMC muaj qee yam kev cuam tshuam thiab huab cua nkag mus, tsis muaj dej tuav, thiab qee qhov poob thaum lub sijhawm.
2. Cov dej tuav pov hwm ntawm HPMC yog qhov pom tseeb, thiab nws muaj kev cuam tshuam loj rau lub xeev, thiab cov dej ntws tau txo qis nrog qhov nce ntawm cov ntsiab lus. Nws muaj qee yam huab cua-entraining nyhuv, thiab lub thickening yog pom tseeb. 15% yuav ua rau cov npuas loj hauv cov slurry, uas yuav ua rau muaj kev puas tsuaj rau lub zog. Nrog rau qhov nce ntawm HPMC viscosity, lub sij hawm-dependent poob ntawm slurry fluidity nce me ntsis, tab sis tsis pom tseeb.
2. Kev sib piv cov slurry fluidity xeem ntawm binary gelling system ntawm ntau yam ntxhia admixtures tov nrog peb cellulose ethers, nws yuav pom tau hais tias:
1. Txoj cai cuam tshuam ntawm peb lub cellulose ethers ntawm fluidity ntawm slurry ntawm binary cementitious system ntawm ntau yam ntxhia admixtures muaj cov yam ntxwv zoo ib yam li txoj cai ntawm lub fluidity ntawm cov ntshiab cement slurry. CMC muaj kev cuam tshuam me ntsis ntawm kev tswj cov ntshav, thiab muaj qhov tsis muaj zog ntawm kev txo cov kua dej; Ob hom HPMC tuaj yeem ua kom cov viscosity ntawm slurry thiab txo cov kua dej ntau, thiab ib qho uas muaj viscosity ntau dua muaj qhov pom tseeb dua.
2. Ntawm cov khoom sib xyaw, cov tshauv ya ya muaj qee qhov kev txhim kho ntawm qhov pib thiab ib nrab-teev fluidity ntawm cov slurry ntshiab, thiab cov ntsiab lus ntawm 30% tuaj yeem nce txog 30 hli; cov nyhuv ntawm cov ntxhia hmoov ntawm lub fluidity ntawm cov ntshiab slurry tsis muaj qhov pom tseeb tsis tu ncua; silicon Txawm hais tias cov ntsiab lus ntawm cov hmoov tshauv tsawg, nws qhov tshwj xeeb ultra-fineness, ceev cov tshuaj tiv thaiv, thiab muaj zog adsorption ua rau nws txo qhov fluidity ntawm slurry, tshwj xeeb tshaj yog thaum 0.15% HPMC ntxiv, yuav muaj cov pwm pwm uas tsis tuaj yeem sau. Qhov tshwm sim.
3. Hauv kev tswj cov ntshav, ya tshauv thiab ntxhia hmoov tsis pom tseeb, thiab silica fume tuaj yeem pom tseeb txo cov ntshav.
4. Nyob rau hauv cov nqe lus ntawm ib nrab-teev poob ntawm fluidity, qhov poob nqi ntawm ya tshauv yog me me, thiab poob tus nqi ntawm cov pab pawg neeg incorporating silica fume yog loj.
5. Nyob rau hauv qhov sib txawv ntawm cov ntsiab lus, cov yam ntxwv cuam tshuam rau lub fluidity ntawm slurry, cov ntsiab lus ntawm HPMC thiab silica fume yog cov tseem ceeb, txawm tias nws yog kev tswj cov ntshav los yog kev tswj ntawm lub xeev ntws, nws yog kuj pom tseeb. Kev cuam tshuam ntawm cov ntxhia hmoov thiab cov hmoov ntxhia hmoov yog qhov thib ob, thiab ua lub luag haujlwm pabcuam hloov kho.
3. Kev sib piv qhov kev ntsuas fluidity ntawm cov cement mortar tov nrog peb cellulose ethers, nws tuaj yeem pom tias
1. Tom qab ntxiv peb lub cellulose ethers, qhov tshwm sim los ntshav tau raug tshem tawm zoo, thiab cov kua dej ntawm cov tshuaj khib feem ntau txo qis. Qee qhov thickening, dej tuav nyhuv. CMC muaj qee yam kev cuam tshuam thiab huab cua nkag mus, tsis muaj dej tuav, thiab qee qhov poob thaum lub sijhawm.
2. Tom qab ntxiv CMC, qhov poob ntawm mortar fluidity nyob rau lub sij hawm nce, uas tej zaum yuav yog vim CMC yog ib tug ionic cellulose ether, uas yog ib qho yooj yim rau tsim los nag nrog Ca2+ nyob rau hauv cov cement.
3. Qhov kev sib piv ntawm peb lub cellulose ethers qhia tau hais tias CMC muaj kev cuam tshuam me ntsis ntawm cov fluidity, thiab ob hom HPMC txo cov fluidity ntawm cov mortar ntawm cov ntsiab lus ntawm 1/1000, thiab ib qho nrog cov viscosity siab dua me ntsis. pom tseeb.
4. Peb hom cellulose ethers muaj qee yam huab cua-entraining nyhuv, uas yuav ua rau saum npoo npuas, tab sis thaum cov ntsiab lus ntawm HPMC nce mus txog ntau tshaj 0.1%, vim lub siab viscosity ntawm slurry, cov npuas tseem nyob rau hauv lub slurry thiab tsis tuaj yeem overflow.
5. Cov dej tuav pov hwm ntawm HPMC yog qhov pom tseeb, uas muaj kev cuam tshuam loj rau lub xeev ntawm cov khoom sib tov, thiab cov kua dej poob qis nrog qhov nce ntawm cov ntsiab lus, thiab cov thickening yog pom tseeb.
4. Sib piv cov fluidity test ntawm ntau cov ntxhia admixture binary cementitious cov ntaub ntawv sib xyaw nrog peb cellulose ethers.
Raws li tuaj yeem pom:
1. Txoj cai cuam tshuam ntawm peb lub cellulose ethers ntawm fluidity ntawm ntau cov khoom siv cementitious mortar zoo ib yam li txoj cai cuam tshuam ntawm fluidity ntawm ntshiab slurry. CMC muaj kev cuam tshuam me ntsis ntawm kev tswj cov ntshav, thiab muaj qhov tsis muaj zog ntawm kev txo cov kua dej; ob hom HPMC tuaj yeem ua kom cov viscosity ntawm mortar thiab txo cov kua dej ntau, thiab cov viscosity siab dua muaj qhov pom tseeb dua.
2. Ntawm cov khoom sib xyaw, cov hmoov tshauv ya tau muaj qee qhov kev txhim kho ntawm qhov pib thiab ib nrab-teev fluidity ntawm cov slurry huv si; lub zog ntawm slag hmoov ntawm lub fluidity ntawm cov slurry huv si tsis muaj qhov pom tseeb tsis tu ncua; Txawm hais tias cov ntsiab lus ntawm silica fume yog tsawg, nws qhov tshwj xeeb ultra-fineness, ceev cov tshuaj tiv thaiv thiab muaj zog adsorption ua rau nws muaj qhov txo qis ntawm cov kua dej ntawm cov slurry. Txawm li cas los xij, piv nrog cov txiaj ntsig ntawm kev tshuaj ntsuam xyuas cov tshuaj dawb huv, nws pom tias cov nyhuv ntawm admixtures zoo li tsis muaj zog.
3. Hauv kev tswj cov ntshav, ya tshauv thiab ntxhia hmoov tsis pom tseeb, thiab silica fume tuaj yeem pom tseeb txo cov ntshav.
4. Nyob rau hauv qhov sib txawv ntawm qhov ntau npaum li cas, cov yam ntxwv cuam tshuam rau lub fluidity ntawm lub mortar, qhov ntau npaum ntawm HPMC thiab silica fume yog qhov tseem ceeb, txawm tias nws yog kev tswj ntshav los yog kev tswj ntawm lub xeev ntws, nws yog ntau dua. pom tseeb, cov silica fume 9% Thaum cov ntsiab lus ntawm HPMC yog 0.15%, nws yog ib qho yooj yim ua rau lub filling pwm yuav nyuaj rau sau, thiab cov cawv ntawm lwm yam admixtures yog theem nrab thiab plays lub luag hauj lwm pab hloov kho.
5. Yuav muaj npuas nyob rau saum npoo ntawm mortar nrog lub fluidity ntawm ntau tshaj 250mm, tab sis cov dawb paug pab pawg neeg uas tsis muaj cellulose ether feem ntau tsis muaj npuas los yog tsuas yog ib tug me me npuas npuas, qhia tias cellulose ether muaj ib tug tej yam huab cua-entraining. cuam tshuam thiab ua rau slurry viscous. Tsis tas li ntawd, vim cov viscosity ntau dhau ntawm cov tshuaj khib nrog cov dej tsis zoo, nws yog qhov nyuaj rau cov pa npuas kom ntab los ntawm tus kheej qhov hnyav ntawm cov slurry, tab sis khaws cia rau hauv mortar, thiab nws lub zog ntawm lub zog tsis tuaj yeem ua tau. tsis quav ntsej.
Tshooj 4 Cov teebmeem ntawm Cellulose Ethers ntawm Cov Khoom Siv Hluav Taws Xob ntawm Cov Khoom Siv Hluav Taws Xob
Tshooj yav dhau los tau kawm txog cov txiaj ntsig ntawm kev siv ua ke ntawm cellulose ether thiab ntau cov ntxhia hauv cov khoom sib xyaw ntawm cov kua dej ntawm cov slurry huv thiab cov kua nplaum siab. Tshooj lus no feem ntau txheeb xyuas kev sib koom ua ke ntawm kev siv cellulose ether thiab ntau yam admixtures ntawm lub siab fluidity mortar Thiab kev cuam tshuam ntawm compressive thiab flexural lub zog ntawm kev sib raug zoo mortar, thiab kev sib raug zoo ntawm tensile bonding zog ntawm lub tsev cog khoom mortar thiab cellulose ether thiab ntxhia. admixtures kuj tau sau thiab txheeb xyuas.
Raws li kev tshawb fawb txog kev ua haujlwm ntawm cellulose ether rau cement-raws li cov khoom siv ntawm cov tshuaj pleev xim dawb thiab tshuaj khib hauv Tshooj 3, hauv qhov kev ntsuam xyuas lub zog, cov ntsiab lus ntawm cellulose ether yog 0.1%.
4.1 Compressive thiab flexural zog kuaj ntawm siab fluidity mortar
Cov compressive thiab flexural zog ntawm ntxhia admixtures thiab cellulose ethers nyob rau hauv high-fluidity infusion mortar tau tshawb xyuas.
4.1.1 Kev ntsuam xyuas cuam tshuam ntawm compressive thiab flexural zog ntawm cov cement-raws li siab fluidity mortar
Cov nyhuv ntawm peb hom cellulose ethers ntawm compressive thiab flexural zog ntawm cov cement-raws li cov kua qaub siab ntawm ntau lub hnub nyoog ntawm cov ntsiab lus ruaj khov ntawm 0.1% tau ua ntawm no.
Kev tshuaj xyuas lub zog thaum ntxov: Hais txog lub zog flexural, CMC muaj qee yam kev txhawb zog, thaum HPMC muaj qee yam kev txo qis; nyob rau hauv cov nqe lus ntawm compressive zog, kev koom ua ke ntawm cellulose ether muaj ib tug zoo xws li txoj cai nrog lub flexural zog; Lub viscosity ntawm HPMC cuam tshuam rau ob lub zog. Nws muaj cov nyhuv me me: nyob rau hauv cov nqe lus ntawm lub siab-fold piv, tag nrho peb cov cellulose ethers tuaj yeem txo qhov siab-fold piv thiab txhim kho qhov yooj yim ntawm mortar. Ntawm lawv, HPMC nrog viscosity ntawm 150,000 muaj qhov pom tseeb tshaj plaws.
(2) Xya-hnub lub zog sib piv cov txiaj ntsig
Xya-hnub lub zog tsom xam: Nyob rau hauv cov nqe lus ntawm flexural zog thiab compressive zog, muaj ib tug zoo xws li txoj cai rau peb-hnub lub zog. Piv nrog rau peb-hnub siab-folding, muaj me ntsis nce ntawm lub zog-folding zog. Txawm li cas los xij, kev sib piv ntawm cov ntaub ntawv ntawm tib lub sijhawm muaj hnub nyoog tuaj yeem pom qhov cuam tshuam ntawm HPMC ntawm kev txo qis ntawm qhov sib npaug ntawm qhov siab-folding. kuj pom tseeb.
(3) Nees nkaum yim hnub lub zog sib piv cov txiaj ntsig
Nees nkaum yim-hnub lub zog tsom xam: Hais txog lub zog flexural thiab compressive zog, muaj cov cai zoo sib xws rau peb-hnub lub zog. Lub zog flexural nce qeeb, thiab lub zog compressive tseem nce mus rau qee yam. Cov ntaub ntawv sib piv ntawm tib lub hnub nyoog qhia tau hais tias HPMC muaj txiaj ntsig zoo dua rau kev txhim kho qhov sib piv-folding.
Raws li qhov kev ntsuam xyuas lub zog ntawm ntu no, nws pom tau tias kev txhim kho ntawm brittleness ntawm mortar yog txwv los ntawm CMC, thiab qee zaum qhov compression-rau-fold piv yog nce, ua rau cov mortar ntau nkig. Nyob rau tib lub sijhawm, vim tias cov dej tuav tau ntau dua li ntawm HPMC, cov cellulose ether peb xav txog qhov kev ntsuas lub zog ntawm no yog HPMC ntawm ob lub viscosities. Txawm hais tias HPMC muaj qee yam cuam tshuam rau kev txo lub zog (tshwj xeeb tshaj yog rau lub zog thaum ntxov), nws muaj txiaj ntsig zoo los txo cov compression-refraction piv, uas yog qhov zoo rau lub zog ntawm cov tshuaj khib nyiab. Tsis tas li ntawd, ua ke nrog cov yam ntxwv cuam tshuam rau qhov fluidity hauv Tshooj 3, hauv kev tshawb fawb txog kev sib xyaw ntawm cov khoom siv sib xyaw thiab CE Hauv kev sim cov nyhuv, peb yuav siv HPMC (100,000) raws li qhov sib txuam CE.
4.1.2 Kev ntsuas ntsuas ntawm compressive thiab flexural lub zog ntawm cov ntxhia admixture siab fluidity mortar
Raws li kev ntsuam xyuas ntawm lub fluidity ntawm ntshiab slurry thiab mortar tov nrog admixtures nyob rau hauv lub dhau los tshooj, nws yuav pom tau hais tias lub fluidity ntawm silica fume yog obviously deteriorated vim cov dej loj xav tau, txawm hais tias nws muaj peev xwm theoretically txhim kho qhov ceev thiab lub zog rau. ib qho twg. , tshwj xeeb tshaj yog lub zog compressive, tab sis nws yog ib qho yooj yim uas yuav ua rau compression-rau-fold piv yuav loj heev, uas ua rau lub mortar brittleness feature zoo kawg li, thiab nws yog ib qho kev pom zoo tias silica fume nce lub shrinkage ntawm mortar. Nyob rau tib lub sij hawm, vim tsis muaj pob txha shrinkage ntawm coarse aggregate, tus nqi shrinkage ntawm mortar yog loj heev txheeb ze rau pob zeb. Rau mortar (tshwj xeeb tshwj xeeb mortar xws li kev sib txuas mortar thiab plastering mortar), qhov teeb meem loj tshaj plaws yog feem ntau shrinkage. Rau cov kab nrib pleb tshwm sim los ntawm kev poob dej, lub zog feem ntau tsis yog qhov tseem ceeb tshaj plaws. Yog li ntawd, silica fume raug muab pov tseg raws li cov khoom xyaw, thiab tsuas yog ya tshauv thiab ntxhia hmoov tau siv los tshawb txog cov txiaj ntsig ntawm nws cov txiaj ntsig sib xyaw nrog cellulose ether ntawm lub zog.
4.1.2.1 Compressive thiab flexural lub zog kuaj lub tswv yim ntawm siab fluidity mortar
Hauv qhov kev sim no, qhov kev faib ua feem ntawm mortar hauv 4.1.1 tau siv, thiab cov ntsiab lus ntawm cellulose ether raug kho ntawm 0.1% thiab piv nrog cov pab pawg dawb. Qhov ntau npaum li cas ntawm cov tshuaj sib tov yog 0%, 10%, 20% thiab 30%.
4.1.2.2 Compressive thiab flexural lub zog kuaj cov txiaj ntsig thiab kev tshuaj xyuas ntawm cov kua roj ntsha siab
Nws tuaj yeem pom los ntawm kev ntsuas lub zog compressive uas tus nqi 3d compressive zog tom qab ntxiv HPMC yog li 5/VIPa qis dua li ntawm pawg dawb paug. Nyob rau hauv dav dav, nrog rau qhov nce ntawm tus nqi ntawm admixture ntxiv, lub compressive lub zog qhia tau hais tias ib tug zuj zus. . Nyob rau hauv cov nqe lus ntawm admixtures, lub zog ntawm cov ntxhia hmoov pawg tsis muaj HPMC yog qhov zoo tshaj plaws, thaum lub zog ntawm cov hmoov tshauv ya ya me ntsis qis dua li cov ntxhia hmoov pawg, qhia tias cov hmoov ntxhia hmoov tsis zoo li cov cement, thiab nws cov kev koom ua ke yuav txo qis me ntsis thaum ntxov lub zog ntawm lub cev. Cov hmoov tshauv ya nrog kev ua haujlwm tsis zoo yuav txo lub zog kom pom tseeb. Yog vim li cas rau kev tsom xam yuav tsum yog hais tias cov yoov tshauv feem ntau koom nyob rau hauv lub thib ob hydration ntawm cement, thiab tsis pab txhawb rau lub zog thaum ntxov ntawm lub mortar.
Nws tuaj yeem pom los ntawm qhov ntsuas lub zog flexural qhov tseem ceeb uas HPMC tseem muaj qhov cuam tshuam tsis zoo rau lub zog flexural, tab sis thaum cov ntsiab lus ntawm cov khoom sib xyaw yog siab dua, qhov tshwm sim ntawm kev txo lub zog flexural tsis pom tseeb. Yog vim li cas tej zaum yuav yog cov dej tuav ntawm HPMC. Cov dej poob tus nqi ntawm qhov chaw ntawm lub mortar test block yog qeeb, thiab cov dej rau hydration kuj txaus.
Nyob rau hauv cov nqe lus ntawm admixtures, lub flexural lub zog qhia tau hais tias ib qho kev poob qis nrog qhov nce ntawm cov ntsiab lus admixture, thiab lub zog flexural ntawm cov pob zeb hauv av hmoov kuj yog me ntsis loj dua li ntawm pawg yoov tshauv, qhia tias kev ua ntawm cov ntxhia hmoov yog ntau tshaj li ntawm cov tshauv ya.
Nws tuaj yeem pom los ntawm kev suav tus nqi ntawm qhov sib piv-txo qhov sib ntxiv ntawm HPMC yuav ua rau txo qis qhov sib piv thiab txhim kho qhov hloov pauv ntawm cov tshuaj khib nyiab, tab sis nws yog qhov tseeb ntawm kev txo qis hauv lub zog compressive.
Nyob rau hauv cov nqe lus ntawm admixtures, raws li tus nqi ntawm admixture nce, lub compression-fold piv yuav nce, qhia tau hais tias lub admixture yog tsis conducive rau qhov yooj ntawm lub mortar. Tsis tas li ntawd, nws tuaj yeem pom tias qhov compression-fold piv ntawm lub mortar tsis muaj HPMC nce ntxiv nrog rau qhov sib ntxiv ntawm cov khoom sib xyaw. Qhov nce yog me ntsis loj dua, uas yog, HPMC tuaj yeem txhim kho qhov embrittlement ntawm mortar los ntawm kev sib ntxiv ntawm cov khoom siv rau qee yam.
Nws tuaj yeem pom tau tias rau lub zog compressive ntawm 7d, qhov tsis zoo ntawm cov khoom siv ntxiv tsis pom tseeb. Cov txiaj ntsig ntawm lub zog compressive yog kwv yees tib yam ntawm txhua qib admixture dosage, thiab HPMC tseem muaj qhov tsis zoo ntawm lub zog compressive. nyhuv.
Nws tuaj yeem pom tau tias nyob rau hauv cov ntsiab lus ntawm flexural zog, cov khoom sib xyaw muaj qhov cuam tshuam tsis zoo rau 7d flexural tsis kam tag nrho, thiab tsuas yog pab pawg ntawm cov hmoov ntxhia ua tau zoo dua, qhov tseem ceeb ntawm 11-12MPa.
Nws tuaj yeem pom tau tias cov tshuaj sib xyaw muaj qhov cuam tshuam tsis zoo nyob rau hauv cov nqe lus ntawm qhov sib piv indentation. Nrog rau qhov nce ntawm tus nqi ntawm cov tshuaj sib tov, qhov sib piv ntawm qhov indentation maj mam nce, uas yog, mortar yog nkig. HPMC tuaj yeem pom tseeb txo qhov compression-fold piv thiab txhim kho lub brittleness ntawm mortar.
Nws tuaj yeem pom tau tias los ntawm 28d compressive zog, cov khoom siv tau ua kom pom tseeb muaj txiaj ntsig zoo ntawm lub zog tom qab, thiab lub zog compressive tau nce los ntawm 3-5MPa, uas feem ntau yog vim muaj cov nyhuv micro-filling ntawm cov tshuaj tov. thiab cov tshuaj pozzolanic. Qhov thib ob hydration nyhuv ntawm cov khoom, ntawm ib sab, tuaj yeem siv thiab haus cov calcium hydroxide uas tsim los ntawm cov cement hydration (calcium hydroxide yog ib qho tsis muaj zog hauv cov tshuaj khib nyiab, thiab nws cov kev nplua nuj nyob hauv thaj chaw hloov pauv yog cuam tshuam rau lub zog), generating ntau hydration khoom, ntawm qhov tod tes, txhawb cov hydration degree ntawm cement thiab ua kom cov mortar ntau ntom. HPMC tseem muaj qhov cuam tshuam tsis zoo rau lub zog compressive, thiab lub zog tsis muaj zog tuaj yeem ncav cuag ntau dua 10MPa. Txhawm rau txheeb xyuas qhov laj thawj, HPMC qhia txog qee yam ntawm cov npuas huab cua hauv cov txheej txheem mortar sib xyaw, uas txo qhov compactness ntawm lub mortar lub cev. Qhov no yog ib qho laj thawj. HPMC tau yooj yim adsorbed rau ntawm qhov chaw ntawm cov khoom siv los ua ib zaj duab xis, cuam tshuam cov txheej txheem dej, thiab thaj chaw hloov pauv tsis muaj zog, uas tsis tsim nyog rau lub zog.
Nws tuaj yeem pom tau tias nyob rau hauv cov nqe lus ntawm 28d flexural zog, cov ntaub ntawv muaj ib tug loj dispersion tshaj compressive zog, tab sis qhov tsis zoo ntawm HPMC tseem tuaj yeem pom.
Nws tuaj yeem pom tau tias, los ntawm qhov pom ntawm qhov sib piv ntawm qhov compression-txo qis, HPMC feem ntau tau txais txiaj ntsig los txo qhov compression-txo piv thiab txhim kho qhov toughness ntawm mortar. Nyob rau hauv ib pab pawg neeg, nrog rau qhov nce ntawm tus nqi ntawm admixtures, qhov compression-refraction ratio nce. Kev soj ntsuam ntawm cov laj thawj qhia tau hais tias cov khoom sib xyaw muaj kev txhim kho hauv lub zog tom qab compressive, tab sis tsuas yog kev txhim kho nyob rau hauv lub zog flexural tom qab, ua rau cov compression-refraction ratio. kev txhim kho.
4.2 Compressive thiab flexural zog kuaj ntawm bonded mortar
Txhawm rau tshawb xyuas qhov cuam tshuam ntawm cellulose ether thiab admixture ntawm compressive thiab flexural zog ntawm bonded mortar, qhov kev sim kho cov ntsiab lus ntawm cellulose ether HPMC (viscosity 100,000) li 0.30% ntawm qhov hnyav qhuav ntawm mortar. thiab muab piv nrog rau pawg neeg dawb huv.
Admixtures (fly tshauv thiab slag hmoov) tseem raug kuaj ntawm 0%, 10%, 20%, thiab 30%.
4.2.1 Compressive thiab flexural lub zog kuaj lub tswv yim ntawm kev sib raug zoo mortar
4.2.2 Kev ntsuam xyuas thiab kev soj ntsuam ntawm lub zog ntawm compressive thiab flexural zog ntawm bonded mortar
Nws tuaj yeem pom los ntawm qhov kev sim uas HPMC pom tau tias tsis zoo nyob rau hauv cov nqe lus ntawm 28d compressive lub zog ntawm lub tsev cog khoom mortar, uas yuav ua rau lub zog txo los ntawm 5MPa, tab sis qhov taw qhia tseem ceeb rau kev txiav txim qhov zoo ntawm lub tsev cog khoom mortar tsis yog tus compressive zog, yog li nws yog txaus; Thaum cov ntsiab lus sib xyaw yog 20%, lub zog compressive yog qhov zoo tagnrho.
Nws tuaj yeem pom los ntawm qhov kev sim uas los ntawm qhov kev xav ntawm lub zog flexural, lub zog txo los ntawm HPMC tsis loj. Tej zaum nws yuav yog tias cov tshuaj khib nyiab muaj cov dej tsis zoo thiab cov yam ntxwv ntawm cov yas zoo piv nrog cov kua dej ntau. Cov txiaj ntsig zoo ntawm slipperiness thiab dej tuav tau zoo offset qee qhov tsis zoo ntawm kev qhia cov pa roj kom txo qis compactness thiab interface tsis muaj zog; admixtures tsis muaj kev cuam tshuam rau flexural zog, thiab cov ntaub ntawv ntawm ya tshauv pawg fluctuates me ntsis.
Nws tuaj yeem pom los ntawm cov kev sim uas, kom deb li deb ntawm qhov sib piv ntawm qhov siab-txo yog kev txhawj xeeb, feem ntau, qhov nce ntawm cov ntsiab lus admixture nce qhov sib piv ntawm qhov siab-txo, uas tsis zoo rau qhov toughness ntawm mortar; HPMC muaj cov txiaj ntsig zoo, uas tuaj yeem txo qhov siab-txo qhov piv ntawm O. 5 saum toj no, nws yuav tsum tau taw qhia tias, raws li "JG 149.2003 Expanded Polystyrene Board Thin Plaster Sab Nraud Sab Nraud Sab Nraud Rwb Txheej Txheej Txheem", feem ntau tsis tas yuav tsum tau ua. rau lub compression-folding piv nyob rau hauv lub nrhiav kom tau qhov Performance index ntawm lub tsev cog khoom mortar, thiab compression-folding piv yog tsuas yog siv los txwv lub brittleness ntawm plastering mortar, thiab qhov Performance index no tsuas yog siv raws li ib tug siv rau qhov yooj yim ntawm kev sib txuas. mortar.
4.3 Bonding Strength Test ntawm Bonding Mortar
Txhawm rau tshawb nrhiav kev cuam tshuam txoj cai ntawm kev sib xyaw ua ke ntawm cellulose ether thiab cov khoom sib xyaw ntawm cov ntawv cog lus lub zog ntawm cov tshuaj khib nyiab, xa mus rau "JG / T3049.1998 Putty rau Tsev Sab Hauv" thiab "JG 149.2003 Expanded Polystyrene Board Thin Plastering Sab nrauv Phab Ntsa" Rwb thaiv tsev Qhov system ", peb tau ua tiav qhov kev ntsuas lub zog ntawm cov khoom sib txuas, siv cov khoom sib txuas sib txuas hauv cov lus 4.2.1, thiab kho cov ntsiab lus ntawm cellulose ether HPMC (viscosity 100,000) rau 0 ntawm qhov hnyav qhuav ntawm mortar .30%. , thiab piv nrog cov pab pawg neeg dawb paug.
Admixtures (fly tshauv thiab slag hmoov) tseem raug kuaj ntawm 0%, 10%, 20%, thiab 30%.
4.3.1 Cov qauv ntsuas ntawm daim ntawv cog lus lub zog ntawm daim ntawv cog lus mortar
4.3.2 Cov txiaj ntsig ntawm kev xeem thiab kev soj ntsuam ntawm daim ntawv cog lus lub zog ntawm daim ntawv cog lus mortar
(1) 14d daim ntawv cog lus lub zog kuaj cov txiaj ntsig ntawm kev sib koom ua ke mortar thiab cement mortar
Nws tuaj yeem pom los ntawm qhov kev sim uas cov pab pawg ntxiv nrog HPMC muaj txiaj ntsig zoo dua li cov pab pawg dawb huv, qhia tias HPMC muaj txiaj ntsig zoo rau kev sib koom ua ke, feem ntau vim tias cov dej tuav ntawm HPMC tiv thaiv cov dej ntawm qhov sib txuas ntawm cov mortar thiab cov cement mortar test block. Lub tsev cog khoom mortar ntawm lub interface yog tag nrho hydrated, yog li ua kom lub zog ntawm daim ntawv cog lus.
Nyob rau hauv cov nqe lus ntawm admixtures, daim ntawv cog lus lub zog yog siab heev ntawm ib tug npaum li cas ntawm 10%, thiab txawm hais tias lub hydration degree thiab ceev ntawm cov cement tuaj yeem txhim kho ntawm qhov ntau npaum li cas, nws yuav ua rau txo qis ntawm tag nrho cov dej ntawm cov cementitious. khoom, yog li ua rau stickiness. txo cov pob txha muaj zog.
Nws tuaj yeem pom los ntawm qhov kev sim uas hais txog qhov ntsuas tus nqi ntawm lub sijhawm ua haujlwm, cov ntaub ntawv yog qhov tsis sib xws, thiab cov khoom sib xyaw ua ke muaj qhov cuam tshuam me me, tab sis feem ntau, piv nrog cov thawj siv, muaj qee qhov txo qis, thiab Qhov txo qis ntawm HPMC yog me dua li ntawm pawg dawb paug, qhia tau hais tias nws tau txiav txim siab tias cov dej khaws cia ntawm HPMC muaj txiaj ntsig zoo rau kev txo cov dej dispersion, yog li ntawd qhov txo qis ntawm mortar bond zog txo tom qab 2.5h.
(2) 14d daim ntawv cog lus lub zog kuaj cov txiaj ntsig ntawm kev sib cog lus mortar thiab nthuav dav polystyrene board
Nws tuaj yeem pom los ntawm qhov kev sim no tias qhov ntsuas tus nqi ntawm lub zog ntawm daim ntawv cog lus ntawm cov mortar thiab polystyrene board yog ntau dua. Feem ntau, nws tuaj yeem pom tau tias cov pab pawg sib xyaw nrog HPMC muaj txiaj ntsig zoo dua li pab pawg dawb paug vim tias cov dej tuav tau zoo dua. Zoo, kev koom ua ke ntawm cov khoom sib xyaw ua ke txo qhov kev ruaj ntseg ntawm daim ntawv cog lus lub zog kuaj.
4.4 Tshooj Summary
1. Rau siab fluidity mortar, nrog rau lub hnub nyoog nce, lub compressive-fold piv muaj ib tug upward trend; Kev sib koom ua ke ntawm HPMC muaj qhov pom tseeb ntawm kev txo lub zog (qhov txo qis hauv lub zog compressive yog qhov pom tseeb dua), uas tseem ua rau txo qis ntawm compression-folding piv, uas yog, HPMC muaj peev xwm pab tau rau kev txhim kho mortar toughness. . Nyob rau hauv cov nqe lus ntawm peb-hnub lub zog, ya tshauv thiab ntxhia hmoov tuaj yeem ua rau me ntsis kev txhawb zog ntawm 10%, thaum lub zog txo qis ntawm qhov ntau npaum li cas, thiab cov crushing piv tau nce nrog qhov nce ntawm cov ntxhia additives; nyob rau hauv xya-hnub lub zog, Ob lub admixtures muaj me ntsis rau lub zog, tab sis tag nrho cov nyhuv ntawm ya tshauv lub zog txo yog tseem pom tseeb; nyob rau hauv cov nqe lus ntawm 28-hnub lub zog, ob qho tib si admixtures tau pab txhawb lub zog, compressive thiab flexural zog. Ob leeg tau nce me ntsis, tab sis lub siab-fold piv tseem nce nrog qhov nce ntawm cov ntsiab lus.
2. Rau 28d compressive thiab flexural lub zog ntawm kev sib raug zoo mortar, thaum lub admixture cov ntsiab lus yog 20%, lub compressive thiab flexural zog kev ua tau zoo dua, thiab cov admixture tseem ua rau ib tug me me nce nyob rau hauv lub compressive-fold piv, reflecting nws Adverse. cuam tshuam rau lub toughness ntawm mortar; HPMC ua rau txo qis zog, tab sis tuaj yeem txo qhov compression-rau-fold piv.
3. Hais txog lub zog ntawm daim ntawv cog lus mortar, HPMC muaj qee yam kev cuam tshuam rau lub zog ntawm daim ntawv cog lus. Kev tsom xam yuav tsum yog tias nws cov dej tuav cov nyhuv txo qhov poob ntawm mortar noo noo thiab ua kom muaj dej txaus; Kev sib raug zoo ntawm cov ntsiab lus ntawm qhov sib tov tsis tu ncua, thiab tag nrho cov kev ua tau zoo dua nrog cov cement mortar thaum cov ntsiab lus yog 10%.
Tshooj 5 Ib txoj hauv kev los kwv yees qhov Compressive Strength ntawm mortar thiab pob zeb
Hauv tshooj no, ib txoj hauv kev los kwv yees lub zog ntawm cov khoom siv cement raws li kev sib xyaw ua haujlwm coefficient thiab FERET lub zog txoj kev xav tau npaj. Peb thawj zaug xav txog mortar ua ib yam tshwj xeeb ntawm pob zeb tsis muaj coarse aggregates.
Nws paub zoo tias lub zog compressive yog qhov taw qhia tseem ceeb rau cov khoom siv cement (concrete thiab mortar) siv los ua cov khoom siv. Txawm li cas los xij, vim muaj ntau yam cuam tshuam, tsis muaj tus qauv lej uas tuaj yeem kwv yees nws qhov hnyav. Qhov no ua rau qee qhov tsis yooj yim rau kev tsim, tsim khoom thiab siv cov mortar thiab pob zeb. Cov qauv uas twb muaj lawm ntawm pob zeb muaj zog muaj lawv tus kheej qhov zoo thiab qhov tsis zoo: qee qhov kwv yees lub zog ntawm pob zeb los ntawm qhov porosity ntawm pob zeb los ntawm qhov pom ntawm qhov porosity ntawm cov khoom siv; qee qhov tsom ntsoov rau kev cuam tshuam ntawm cov dej-binder piv kev sib raug zoo ntawm lub zog. Daim ntawv no tsuas yog sib txuas cov kev ua haujlwm coefficient ntawm pozzolanic admixture nrog Feret lub zog txoj kev xav, thiab ua rau qee qhov kev txhim kho kom nws muaj tseeb dua los kwv yees lub zog compressive.
5.1 Feret's Strength Theory
Xyoo 1892, Feret tau tsim cov qauv lej ntxov tshaj plaws rau kev kwv yees compressive zog. Nyob rau hauv lub premise ntawm muab cov khoom siv raw, cov qauv rau kev kwv yees lub zog ua vaj tse yog npaj rau thawj zaug.
Qhov zoo ntawm cov qauv no yog tias cov grout concentration, uas cuam tshuam nrog cov pob zeb ua kom muaj zog, muaj lub ntsiab lus zoo ntawm lub cev. Nyob rau tib lub sijhawm, kev cuam tshuam ntawm cov ntsiab lus ntawm huab cua yog coj mus rau hauv tus account, thiab qhov tseeb ntawm cov qauv tuaj yeem ua pov thawj ntawm lub cev. Qhov laj thawj rau cov qauv no yog tias nws qhia cov ntaub ntawv hais tias muaj kev txwv rau cov pob zeb ua kom muaj zog uas tuaj yeem tau txais. Qhov tsis zoo yog tias nws tsis quav ntsej txog kev cuam tshuam ntawm cov khoom sib sau ua ke, cov duab particle thiab hom sib sau ua ke. Thaum kwv yees lub zog ntawm cov pob zeb sib txawv ntawm cov hnub nyoog sib txawv los ntawm kev kho tus nqi K, kev sib raug zoo ntawm lub zog sib txawv thiab hnub nyoog yog qhia raws li cov txheej txheem sib txawv los ntawm kev sib koom ua ke. Qhov nkhaus tsis sib haum nrog qhov xwm txheej tiag tiag (tshwj xeeb tshaj yog thaum muaj hnub nyoog ntev dua). Tau kawg, cov qauv no tau thov los ntawm Feret yog tsim los rau cov mortar ntawm 10.20MPa. Nws tsis tuaj yeem hloov kho kom haum rau kev txhim kho ntawm cov pob zeb ua kom muaj zog thiab kev cuam tshuam ntawm cov khoom siv ntxiv vim qhov kev nce qib ntawm kev siv tshuab mortar pob zeb.
Nws raug suav hais tias ntawm no tias lub zog ntawm pob zeb (tshwj xeeb tshaj yog cov pob zeb zoo tib yam) feem ntau yog nyob ntawm lub zog ntawm cov cement mortar hauv cov pob zeb, thiab lub zog ntawm cov cement mortar nyob ntawm qhov ntom ntawm cov cement muab tshuaj, uas yog, qhov feem pua. ntawm cov khoom siv cementitious hauv paste.
Txoj kev xav yog ze ze rau qhov cuam tshuam ntawm qhov tsis muaj qhov sib piv ntawm lub zog. Txawm li cas los xij, vim hais tias txoj kev xav tau muab tso ua ntej, qhov cuam tshuam ntawm cov khoom sib xyaw ntawm cov pob zeb ua kom muaj zog tsis tau txiav txim siab. Raws li qhov no, daim ntawv no yuav qhia txog qhov sib xyaw ua ke ntawm cov coefficient raws li kev ua haujlwm coefficient rau kev kho ib feem. Nyob rau tib lub sijhawm, raws li cov qauv no, kev cuam tshuam coefficient ntawm porosity ntawm pob zeb muaj zog yog rov tsim dua.
5.2 Kev ua haujlwm coefficient
Kev ua haujlwm coefficient, Kp, yog siv los piav txog cov txiaj ntsig ntawm cov ntaub ntawv pozzolanic ntawm lub zog compressive. Pom tseeb, nws nyob ntawm qhov xwm txheej ntawm cov khoom siv pozzolanic nws tus kheej, tab sis kuj nyob ntawm lub hnub nyoog ntawm cov pob zeb. Lub hauv paus ntsiab lus ntawm kev txiav txim siab coefficient ntawm kev ua si yog los sib piv lub zog compressive ntawm tus qauv mortar nrog lub zog compressive ntawm lwm cov mortar nrog pozzolanic admixtures thiab hloov cov cement nrog tib tus nqi ntawm cov cement zoo (lub teb chaws p yog qhov kev xeem coefficient. Siv surrogate. feem pua). Qhov piv ntawm ob qhov kev siv zog no yog hu ua kev ua haujlwm coefficient fO), qhov twg t yog lub hnub nyoog ntawm cov tshuaj khib nyiab thaum lub sijhawm kuaj. Yog tias fO) tsawg dua 1, qhov kev ua ntawm pozzolan tsawg dua li cov cement r. Hloov pauv, yog tias fO) ntau dua 1, lub pozzolan muaj ntau dua reactivity (qhov no feem ntau tshwm sim thaum silica fume ntxiv).
Rau cov kev ua si feem ntau siv coefficient ntawm 28-hnub compressive lub zog, raws li ((GBT18046.2008 Granulated blast furnace slag hmoov siv hauv cov cement thiab pob zeb) H90, cov dej num coefficient ntawm granulated blast furnace slag hmoov yog nyob rau hauv tus qauv cement mortar Lub zog piv tau los ntawm kev hloov 50% xis mas raws li qhov kev xeem raws li ((GBT1596.2005 ya tshauv siv hauv cov cement thiab pob zeb), qhov kev ua haujlwm coefficient ntawm ya tshauv yog tau tom qab hloov 30% cement raws li tus qauv cement mortar. test Raws li "GB.T27690.2011 Silica Fume rau mortar thiab pob zeb", qhov kev ua haujlwm coefficient ntawm silica fume yog lub zog piv tau los ntawm kev hloov 10% cement raws li cov qauv cement mortar test.
Feem ntau, granulated blast furnace slag hmoov Kp = 0.95 ~ 1.10, ya tshauv Kp = 0.7-1.05, silica fume Kp = 1.00 ~ 1.15. Peb xav tias nws cov nyhuv ntawm lub zog yog ywj siab ntawm cov cement. Ntawd yog, cov txheej txheem ntawm cov tshuaj tiv thaiv pozzolanic yuav tsum tau tswj los ntawm kev ua haujlwm ntawm pozzolan, tsis yog los ntawm cov kua qaub nag lossis daus ntawm cov cement hydration.
5.3 Influence coefficient ntawm admixture ntawm lub zog
5.4 Kev cuam tshuam coefficient ntawm kev siv dej ntawm lub zog
5.5 Influence coefficient ntawm aggregate muaj pes tsawg leeg ntawm lub zog
Raws li cov kev xav ntawm cov xibfwb PK Mehta thiab PC Aitcin hauv Tebchaws Meskas, txhawm rau ua tiav cov haujlwm zoo tshaj plaws thiab lub zog ntawm HPC tib lub sijhawm, qhov sib piv ntawm cov cement slurry rau aggregate yuav tsum yog 35: 65 [4810] Vim tias ntawm cov plasticity thiab fluidity tag nrho cov aggregate ntawm pob zeb tsis hloov ntau. Ntev npaum li lub zog ntawm cov khoom siv hauv paus nws tus kheej ua tau raws li qhov yuav tsum tau ua ntawm cov kev qhia tshwj xeeb, kev cuam tshuam ntawm tag nrho cov nyiaj ntawm cov khoom sib sau ntawm lub zog yog tsis quav ntsej, thiab tag nrho cov feem tseem ceeb tuaj yeem txiav txim siab hauv 60-70% raws li qhov yuav tsum tau ua. .
Nws yog theoretically ntseeg tias qhov piv ntawm ntxhib thiab nplua aggregates yuav muaj qee yam cuam tshuam rau lub zog ntawm pob zeb. Raws li peb txhua tus paub, qhov tsis muaj zog tshaj plaws hauv pob zeb yog qhov kev hloov pauv ntawm thaj chaw sib xyaw thiab cov cement thiab lwm cov khoom siv cementitious pastes. Yog li ntawd, qhov kawg tsis ua hauj lwm ntawm cov qhob qhob yog vim qhov kev puas tsuaj ntawm thawj zaug ntawm qhov kev hloov pauv hauv cheeb tsam nyob rau hauv kev ntxhov siab los ntawm yam xws li kev thauj khoom lossis kev hloov pauv kub. tshwm sim los ntawm kev txhim kho txuas ntxiv ntawm cov kab nrib pleb. Yog li ntawd, thaum lub degree ntawm hydration zoo sib xws, qhov loj ntawm qhov kev hloov pauv cheeb tsam yog, qhov yooj yim dua qhov pib tawg yuav loj hlob mus rau hauv ntev los ntawm kev tawg tom qab kev ntxhov siab concentration. Uas yog hais tias, qhov ntau coarse aggregates nrog ntau cov duab geometric tsis tu ncua thiab cov nplai loj dua hauv thaj chaw hloov pauv hloov pauv, qhov ntau dua qhov kev ntxhov siab ntau dua qhov tshwm sim ntawm qhov pib tawg, thiab macroscopically manifested tias cov pob zeb muaj zog nce nrog qhov nce ntawm cov ntxhib aggregate. piv. txo. Txawm li cas los xij, lub ntsiab lus saum toj no yog tias nws yuav tsum yog cov xuab zeb nruab nrab nrog cov av nkos tsawg heev.
Cov xuab zeb tus nqi kuj muaj qee yam cuam tshuam rau qhov poob qis. Yog li ntawd, cov xuab zeb tuaj yeem raug preset los ntawm cov kev xav tau poob qis, thiab tuaj yeem txiav txim siab li ntawm 32% mus rau 46% rau cov pob zeb zoo tib yam.
Tus nqi thiab ntau yam ntawm admixtures thiab ntxhia admixtures yog txiav txim los ntawm kev sim sib tov. Hauv cov pob zeb zoo tib yam, cov ntxhia ntxiv yuav tsum tsawg dua 40%, thaum lub pob zeb muaj zog, silica fume yuav tsum tsis pub tshaj 10%. Cov cement yuav tsum tsis txhob ntau tshaj 500kg / m3.
5.6 Daim ntawv thov ntawm txoj kev kwv yees no los qhia kev sib xyaw ua piv txwv suav nrog
Cov khoom siv yog raws li nram no:
Cov cement yog E042.5 cement tsim los ntawm Lubi Cement Factory, Laiwu City, Shandong Province, thiab nws qhov ceev yog 3.19 / cm3;
Cov hmoov tshauv ya yog qib II pob tshauv uas tsim los ntawm Jinan Huangtai Fais Fab Cog, thiab nws cov dej num coefficient yog O. 828, nws qhov ceev yog 2.59 / cm3;
silica fume tsim los ntawm Shandong Sanmei Silicon Material Co., Ltd.
Taian qhuav dej xuab zeb muaj qhov ntom ntawm 2.6 g / cm3, qhov ntom ntom ntawm 1480kg / m3, thiab qhov zoo ntawm Mx = 2.8;
Jinan Ganggou tsim 5-'25mm qhuav crushed pob zeb nrog ib tug loj ceev ntawm 1500kg / m3 thiab ib tug ceev ntawm txog 2.7∥cm3;
Cov dej-txo tus neeg saib xyuas siv yog tus kheej-ua aliphatic high-efficiency dej-txo tus neeg saib xyuas, nrog rau cov dej-txo tus nqi ntawm 20%; cov koob tshuaj tshwj xeeb yog txiav txim siab sim raws li qhov xav tau ntawm kev poob qis. Kev sim npaj ntawm C30 pob zeb, qhov poob qis yuav tsum muaj ntau dua 90mm.
1. formulation zog
2. xuab zeb zoo
3. Kev txiav txim siab ntawm qhov cuam tshuam ntawm txhua qhov kev siv zog
4. Thov kev siv dej
5. Qhov ntau npaum li cas ntawm cov dej-txo tus neeg sawv cev yog hloov raws li qhov yuav tsum tau muaj ntawm slump. Qhov ntau npaum li cas yog 1%, thiab Ma = 4kg yog ntxiv rau qhov loj.
6. Nyob rau hauv no txoj kev, lub xam piv yog tau
7. Tom qab kev sim sib tov, nws tuaj yeem ua tau raws li qhov yuav tsum tau ua kom poob qis. Qhov ntsuas 28d compressive zog yog 39.32MPa, uas ua tau raws li qhov yuav tsum tau ua.
5.7 Tshooj Summary
Nyob rau hauv cov ntaub ntawv ntawm tsis quav ntsej qhov kev sib cuam tshuam ntawm cov admixtures I thiab F, peb tau sib tham txog cov dej num coefficient thiab Feret lub zog txoj kev xav, thiab tau txais kev cuam tshuam ntawm ntau yam ntawm lub zog ntawm pob zeb:
1 Concrete admixture influence coefficient
2 Kev cuam tshuam coefficient ntawm kev siv dej
3 Kev cuam tshuam coefficient ntawm kev sib sau ua ke
4 Qhov sib piv tiag tiag. Nws tau raug txheeb xyuas tias 28d lub zog kwv yees txoj kev ua vaj tse tau txhim kho los ntawm kev ua haujlwm coefficient thiab Feret lub zog txoj kev xav tau pom zoo nrog qhov xwm txheej tiag tiag, thiab nws tuaj yeem siv los coj kev npaj ntawm mortar thiab pob zeb.
Tshooj 6 Xaus thiab Outlook
6.1 Cov ntsiab lus tseem ceeb
Thawj qhov sib piv cov slurry huv thiab mortar fluidity xeem ntawm ntau yam ntxhia admixtures sib xyaw nrog peb hom cellulose ethers, thiab pom cov cai hauv qab no:
1. Cellulose ether muaj qee yam cuam tshuam thiab ua rau huab cua nkag. Ntawm lawv, CMC muaj cov dej tsis muaj zog khaws cia ntawm cov tshuaj tsawg, thiab muaj qee yam poob thaum lub sijhawm; Thaum HPMC muaj qhov tseem ceeb ntawm cov dej tuav thiab cov nyhuv thickening, uas txo cov fluidity ntawm ntshiab pulp thiab mortar, thiab cov thickening nyhuv ntawm HPMC nrog siab nominal viscosity yog me ntsis pom tseeb.
2. Ntawm cov khoom sib xyaw, qhov pib thiab ib nrab-teev fluidity ntawm ya tshauv ntawm cov slurry huv si thiab mortar tau txhim kho rau qee yam. 30% cov ntsiab lus ntawm kev kuaj slurry huv tuaj yeem nce txog 30 hli; lub fluidity ntawm cov ntxhia hmoov ntawm cov slurry huv si thiab mortar Tsis muaj kev cai lij choj ntawm kev cuam tshuam; Txawm hais tias cov ntsiab lus ntawm silica fume tsis tshua muaj, nws qhov tshwj xeeb ultra-fineness, ceev cov tshuaj tiv thaiv, thiab muaj zog adsorption ua rau nws muaj qhov txo qis ntawm cov dej huv ntawm slurry thiab mortar, tshwj xeeb tshaj yog thaum tov nrog 0.15% HPMC, yuav muaj phenomenon uas lub khob hliav qab tuag tsis tuaj yeem sau. Piv nrog rau cov txiaj ntsig kev xeem ntawm cov slurry huv si, nws pom tau tias cov nyhuv ntawm cov khoom sib xyaw hauv cov tshuaj khib nyiab yuav tsis muaj zog. Hais txog kev tswj ntshav, ya tshauv thiab ntxhia hmoov tsis pom tseeb. Silica fume tuaj yeem txo cov ntshav ntau, tab sis nws tsis yog qhov tsim nyog rau kev txo qis ntawm mortar fluidity thiab poob lub sijhawm, thiab nws yooj yim los txo lub sijhawm ua haujlwm.
3. Nyob rau hauv qhov kev hloov pauv ntau npaum li cas, cov yam ntxwv cuam tshuam rau cov dej ntws ntawm cov cement-based slurry, qhov ntau npaum li cas ntawm HPMC thiab silica fume yog qhov tseem ceeb, ob qho tib si hauv kev tswj cov ntshav thiab kev tswj ntawm lub xeev ntws, yog qhov pom tseeb. Kev cuam tshuam ntawm thee tshauv thiab ntxhia hmoov yog qhov thib ob thiab ua lub luag haujlwm pabcuam hloov kho.
4. Peb hom cellulose ethers muaj qee yam huab cua-entraining nyhuv, uas yuav ua rau npuas dej ntws mus rau saum npoo ntawm cov slurry ntshiab. Txawm li cas los xij, thaum cov ntsiab lus ntawm HPMC nce mus txog ntau dua 0.1%, vim yog cov viscosity siab ntawm slurry, cov npuas tsis tuaj yeem khaws cia hauv slurry. dej ntws. Yuav muaj npuas nyob rau saum npoo ntawm mortar nrog fluidity saum 250ram, tab sis cov pab pawg dawb paug tsis muaj cellulose ether feem ntau tsis muaj npuas lossis tsuas yog ib qho me me ntawm npuas, qhia tias cellulose ether muaj qee yam huab cua nkag thiab ua rau slurry. khov. Tsis tas li ntawd, vim cov viscosity ntau dhau ntawm cov tshuaj khib nrog cov dej tsis zoo, nws yog qhov nyuaj rau cov pa npuas kom ntab los ntawm tus kheej qhov hnyav ntawm cov slurry, tab sis khaws cia rau hauv mortar, thiab nws lub zog ntawm lub zog tsis tuaj yeem ua tau. tsis quav ntsej.
Part II Mortar Mechanical Properties
1. Rau siab fluidity mortar, nrog rau lub hnub nyoog nce, lub crushing ratio muaj ib tug upward sib; Qhov sib ntxiv ntawm HPMC muaj qhov cuam tshuam tseem ceeb ntawm kev txo lub zog (qhov txo qis hauv lub zog compressive yog qhov pom tseeb dua), uas tseem ua rau kev sib tsoo qhov txo qis ntawm qhov piv, uas yog, HPMC muaj peev xwm pab tau rau kev txhim kho ntawm mortar toughness. Nyob rau hauv cov nqe lus ntawm peb-hnub lub zog, ya tshauv thiab ntxhia hmoov tuaj yeem ua rau me ntsis kev txhawb zog ntawm 10%, thaum lub zog txo qis ntawm qhov ntau npaum li cas, thiab cov crushing piv tau nce nrog qhov nce ntawm cov ntxhia additives; nyob rau hauv xya-hnub lub zog, Ob lub admixtures muaj me ntsis rau lub zog, tab sis tag nrho cov nyhuv ntawm ya tshauv lub zog txo yog tseem pom tseeb; nyob rau hauv cov nqe lus ntawm 28-hnub lub zog, ob qho tib si admixtures tau pab txhawb lub zog, compressive thiab flexural zog. Ob leeg tau nce me ntsis, tab sis lub siab-fold piv tseem nce nrog qhov nce ntawm cov ntsiab lus.
2. Rau 28d compressive thiab flexural lub zog ntawm kev sib raug zoo mortar, thaum lub admixture cov ntsiab lus yog 20%, lub compressive thiab flexural zog yog zoo dua, thiab cov admixture tseem ua rau ib tug me me nce nyob rau hauv lub compressive-rau-fold piv, xav txog nws. cuam tshuam rau lub mortar. Cov teebmeem ntawm toughness; HPMC ua rau muaj qhov txo qis hauv lub zog.
3. Hais txog lub zog ntawm daim ntawv cog lus mortar, HPMC muaj cov txiaj ntsig zoo rau lub zog ntawm daim ntawv cog lus. Kev tsom xam yuav tsum yog tias nws cov dej tuav cov nyhuv txo qhov poob dej hauv cov tshuaj khib nyiab thiab ua kom muaj dej txaus ntau dua. Lub zog daim ntawv cog lus muaj feem xyuam nrog cov khoom sib xyaw. Kev sib raug zoo ntawm cov tshuaj tsis tu ncua, thiab kev ua haujlwm tag nrho yog qhov zoo dua nrog cov cement mortar thaum noj ntau npaum li 10%.
4. CMC tsis haum rau cov cement-based cementitious cov ntaub ntawv, nws cov dej tuav cov nyhuv tsis pom tseeb, thiab tib lub sijhawm, nws ua rau cov mortar ntau nkig; thaum HPMC tuaj yeem txo qhov compression-rau-fold piv thiab txhim kho qhov toughness ntawm mortar, tab sis nws yog tus nqi ntawm kev txo qis hauv compressive zog.
5. Cov kev xav tau ntawm fluidity thiab lub zog, HPMC cov ntsiab lus ntawm 0.1% yog qhov tsim nyog dua. Thaum ya tshauv yog siv rau cov txheej txheem los yog cov mortar uas yuav tsum tau ceev hardening thiab thaum ntxov lub zog, qhov ntau npaum li cas yuav tsum tsis txhob siab dhau, thiab qhov siab tshaj plaws npaum li cas yog hais txog 10%. Kev xav tau; xav txog tej yam xws li qhov tsis zoo ntim stability ntawm cov ntxhia hmoov thiab silica fume, lawv yuav tsum tau tswj ntawm 10% thiab n 3% raws li. Cov teebmeem ntawm admixtures thiab cellulose ethers tsis muaj kev sib raug zoo, nrog
muaj kev ywj pheej.
Qhov thib peb Nyob rau hauv rooj plaub ntawm tsis quav ntsej qhov kev sib cuam tshuam ntawm cov khoom sib xyaw, los ntawm kev sib tham ntawm cov dej num coefficient ntawm cov ntxhia admixtures thiab Feret lub zog txoj kev xav, cov kev cai ntawm ntau yam ntawm lub zog ntawm pob zeb (mortar) tau txais:
1. Mineral Admixture Influence Coefficient
2. cuam tshuam coefficient ntawm kev siv dej
3. Kev cuam tshuam ntawm kev sib sau ua ke
4. Qhov kev sib piv tiag tiag qhia tau hais tias 28d lub zog kwv yees txoj kev ntawm cov pob zeb txhim kho los ntawm kev ua haujlwm coefficient thiab Feret lub zog txoj kev xav tau pom zoo nrog qhov xwm txheej tiag tiag, thiab nws tuaj yeem siv los qhia kev npaj ntawm mortar thiab pob zeb.
6.2 Qhov Tsis Zoo thiab Kev Pom Zoo
Daim ntawv no tsuas yog kawm txog qhov fluidity thiab mechanical zog ntawm cov tshuaj ntxuav kom huv thiab mortar ntawm binary cementitious system. Cov txiaj ntsig thiab kev cuam tshuam ntawm kev sib koom ua ke ntawm ntau cov khoom siv cementitious yuav tsum tau kawm ntxiv. Hauv txoj kev sim, mortar sib xws thiab stratification tuaj yeem siv. Cov nyhuv ntawm cellulose ether ntawm qhov sib xws thiab dej tuav ntawm mortar yog kawm los ntawm qib ntawm cellulose ether. Tsis tas li ntawd, lub microstructure ntawm mortar nyob rau hauv lub compound kev txiav txim ntawm cellulose ether thiab mineral admixture kuj yuav tsum tau kawm.
Cellulose ether tam sim no yog ib qho tseem ceeb ntawm cov khoom sib xyaw ntawm ntau yam mortars. Nws cov dej tuav tau zoo ua rau lub sijhawm ua haujlwm ntawm cov mortar, ua rau cov mortar muaj cov thixotropy zoo, thiab txhim kho cov tawv tawv ntawm cov mortar. Nws yooj yim rau kev tsim kho; thiab daim ntawv thov ntawm ya tshauv thiab ntxhia hmoov raws li kev lag luam pov tseg hauv mortar kuj tuaj yeem tsim kev lag luam zoo thiab ib puag ncig
Tshooj 1 Kev Taw Qhia
1.1 khoom mortar
1.1.1 Taw qhia txog kev lag luam mortar
Hauv kuv lub teb chaws cov ntaub ntawv kev lag luam, cov pob zeb tau ua tiav qib siab ntawm kev lag luam, thiab kev lag luam ntawm mortar kuj tau nce siab dua, tshwj xeeb tshaj yog rau ntau yam tshwj xeeb mortars, cov tuam txhab uas muaj peev xwm ntau dua yuav tsum tau ua kom muaj ntau yam mortars. Cov ntsuas kev ua tau zoo yog tsim nyog. Kev lag luam mortar tau muab faib ua ob pawg: npaj txhij-siv mortar thiab qhuav-siv mortar. Npaj-siv mortar txhais tau hais tias cov mortar raug thauj mus rau qhov chaw tsim kho tom qab sib xyaw nrog dej los ntawm tus neeg muag khoom ua ntej raws li qhov project yuav tsum tau, thaum lub mortar qhuav yog tsim los ntawm cov chaw tsim khoom mortar los ntawm kev sib xyaw qhuav thiab ntim cov ntaub ntawv cementitious, aggregates thiab additives raws li ib qho piv txwv. Ntxiv ib qho dej rau hauv qhov chaw tsim kho thiab sib tov ua ntej siv.
Cov tshuaj khib nyiab muaj ntau qhov tsis zoo hauv kev siv thiab kev ua haujlwm. Piv txwv li, kev sib tsoo ntawm cov khoom siv raw thiab kev sib xyaw ntawm qhov chaw tsis tuaj yeem ua tau raws li cov kev cai ntawm kev tsim kho thiab kev tiv thaiv ib puag ncig. Tsis tas li ntawd, vim yog kev tsim kho ntawm qhov chaw thiab lwm yam laj thawj, nws yog ib qho yooj yim los ua qhov zoo ntawm mortar nyuaj rau lav, thiab nws tsis tuaj yeem tau txais kev ua haujlwm siab. mortar. Piv nrog rau cov tshuaj khib nyiab, kev lag luam mortar muaj qee qhov zoo. Ua ntej ntawm tag nrho cov, nws qhov zoo yog yooj yim los tswj thiab lav, nws cov kev ua tau zoo tshaj, nws hom yog refined, thiab nws yog zoo dua tsom rau engineering yuav tsum. European qhuav-mixed mortar tau tsim nyob rau hauv 1950s, thiab kuv lub teb chaws tseem muaj zog tawm tswv yim rau daim ntawv thov kev lag luam mortar. Shanghai twb tau siv coj mus muag mortar nyob rau hauv 2004. Nrog rau kev txhim kho tas mus li ntawm kuv lub teb chaws cov txheej txheem urbanization, yam tsawg kawg nyob rau hauv lub nroog lag luam, nws yuav inevitable uas coj mus muag mortar nrog ntau yam zoo yuav hloov cov tsoos mortar.
1.1.2Teeb meem uas muaj nyob rau hauv kev lag luam mortar
Txawm hais tias kev lag luam mortar muaj ntau qhov zoo dua li cov tshuaj khib nyiab, tseem muaj ntau yam kev nyuaj raws li mortar. High fluidity mortar, xws li reinforcement mortar, cement-based grouting cov ntaub ntawv, thiab lwm yam, muaj cov kev xav tau siab heev ntawm lub zog thiab kev ua haujlwm, yog li kev siv cov superplasticizers loj, uas yuav ua rau mob hnyav thiab cuam tshuam rau mortar. Kev ua tau zoo; thiab rau qee cov yas mortars, vim tias lawv yog cov rhiab heev rau kev poob dej, nws yog ib qho yooj yim kom muaj kev poob qis hauv kev ua haujlwm vim qhov poob dej hauv lub sijhawm luv luv tom qab sib tov, thiab lub sijhawm ua haujlwm yog luv heev: Ntxiv rau. Nyob rau hauv cov nqe lus ntawm bonding mortar, lub bonding matrix yog feem ntau kuj qhuav. Thaum lub sij hawm kev tsim kho, vim lub peev xwm tsis txaus ntawm cov mortar khaws dej, cov dej ntau yuav nqus los ntawm cov matrix, ua rau cov dej hauv zos tsis txaus ntawm cov khoom sib txuas thiab cov dej tsis txaus. Qhov tshwm sim uas lub zog txo qis thiab cov nplaum nplaum qis.
Nyob rau hauv teb rau cov lus nug saum toj no, ib qho tseem ceeb additive, cellulose ether, yog dav siv nyob rau hauv mortar. Raws li ib yam ntawm etherified cellulose, cellulose ether muaj affinity rau dej, thiab cov polymer compound no muaj zoo heev dej nqus thiab dej retention muaj peev xwm, uas muaj peev xwm daws tau cov ntshav los ntawm mortar, lub sij hawm luv luv ua hauj lwm, stickiness, thiab lwm yam. teeb meem.
Tsis tas li ntawd, cov khoom sib xyaw ua ib feem ntawm cov cement, xws li ya tshauv, granulated blast furnace slag hmoov (mineral hmoov), silica fume, thiab lwm yam, tam sim no tseem ceeb dua. Peb paub tias feem ntau ntawm cov khoom sib xyaw yog cov khoom siv los ntawm kev lag luam xws li hluav taws xob fais fab, smelting steel, smelting ferrosilicon thiab industrial silicon. Yog tias lawv tsis tuaj yeem siv tau tag nrho, cov khoom sib xyaw ua ke yuav nyob thiab rhuav tshem cov av loj thiab ua rau muaj kev puas tsuaj loj. ib puag ncig muaj kuab paug. Ntawm qhov tod tes, yog tias siv cov khoom sib xyaw kom haum, qee qhov khoom ntawm pob zeb thiab mortar tuaj yeem txhim kho, thiab qee qhov teeb meem engineering hauv kev siv cov pob zeb thiab mortar tuaj yeem daws tau zoo. Yog li ntawd, kev siv dav dav ntawm cov khoom siv sib xyaw ua ke muaj txiaj ntsig zoo rau ib puag ncig thiab kev lag luam. muaj txiaj ntsig.
1.2Cellulose ethers
Cellulose ether (cellulose ether) yog ib qho polymer compound nrog ether qauv tsim los ntawm etherification ntawm cellulose. Txhua lub nplhaib glucosyl hauv cellulose macromolecules muaj peb pawg hydroxyl, thawj pawg hydroxyl nyob rau thib rau carbon atom, ib pawg hydroxyl thib ob thiab thib peb carbon atoms, thiab hydrogen hauv pawg hydroxyl yog hloov los ntawm pawg hydrocarbon los tsim cellulose ether. derivatives. yam. Cellulose yog polyhydroxy polymer compound uas tsis yaj lossis yaj, tab sis cellulose tuaj yeem yaj hauv dej, dilute alkali kua thiab organic hnyav tom qab etherification, thiab muaj qee yam thermoplasticity.
Cellulose ether siv cov cellulose ntuj ua raw khoom thiab npaj los ntawm kev hloov tshuaj. Nws tau muab faib ua ob pawg: ionic thiab non-ionic hauv daim ntawv ionized. Nws yog dav siv hauv tshuaj, roj av, kev tsim kho, tshuaj, ceramics thiab lwm yam lag luam. .
1.2.1Kev faib tawm ntawm cellulose ethers rau kev tsim kho
Cellulose ether rau kev tsim kho yog cov ntsiab lus dav dav rau cov khoom lag luam uas tsim los ntawm cov tshuaj tiv thaiv ntawm alkali cellulose thiab etherifying tus neeg saib xyuas nyob rau hauv qee yam mob. Ntau hom cellulose ethers tuaj yeem tau los ntawm kev hloov cov alkali cellulose nrog cov neeg ua haujlwm sib txawv.
1. Raws li cov khoom ionization ntawm cov khoom hloov, cellulose ethers tuaj yeem muab faib ua ob pawg: ionic (xws li carboxymethyl cellulose) thiab non-ionic (xws li methyl cellulose).
2. Raws li hom kev hloov pauv, cellulose ethers tuaj yeem muab faib ua ib qho ethers (xws li methyl cellulose) thiab sib xyaw ethers (xws li hydroxypropyl methyl cellulose).
3. Raws li qhov sib txawv solubility, nws muab faib ua dej-soluble (xws li hydroxyethyl cellulose) thiab organic solvent solubility (xws li ethyl cellulose), thiab lwm yam. Cov ntawv thov tseem ceeb hauv cov tshuaj khib nyiab qhuav yog dej-soluble cellulose, thaum dej. -soluble cellulose Nws muab faib ua hom instant thiab ncua sij hawm dissolution hom tom qab kho deg.
1.2.2 Kev piav qhia ntawm cov txheej txheem ntawm kev ua ntawm cellulose ether hauv mortar
Cellulose ether yog ib qho tseem ceeb admixture los txhim kho cov dej tuav cov khoom ntawm cov khoom sib xyaw qhuav, thiab nws kuj yog ib qho tseem ceeb ntawm cov khoom siv los txiav txim siab tus nqi ntawm cov khoom siv khib nyiab qhuav.
1. Tom qab cov cellulose ether nyob rau hauv mortar yog yaj nyob rau hauv dej, qhov tshwj xeeb nto kev ua kom ntseeg tau tias cov cementitious cov ntaub ntawv zoo thiab uniformly dispersed nyob rau hauv lub slurry system, thiab cellulose ether, raws li ib tug tiv thaiv colloid, muaj peev xwm "encapsulate" khoom hais, Yog li. , lubricating zaj duab xis yog tsim rau sab nrauv, thiab cov zaj duab xis lubricating tuaj yeem ua rau lub cev muaj thixotropy zoo. Uas yog hais tias, qhov ntim yog qhov ruaj khov nyob rau hauv lub xeev sawv, thiab yuav tsis muaj qhov tshwm sim tsis zoo xws li los ntshav los yog stratification ntawm lub teeb thiab hnyav, uas ua rau cov mortar system ruaj khov; Thaum nyob rau hauv lub xeev agitated kev tsim kho, lub cellulose ether yuav ua si lub luag hauj lwm nyob rau hauv txo cov shearing ntawm slurry. Cov nyhuv ntawm kev sib txawv kuj ua rau cov mortar muaj fluidity zoo thiab smoothness thaum lub sij hawm tsim kho thaum lub sij hawm sib tov.
2. Vim yog cov yam ntxwv ntawm nws tus kheej cov qauv molecular, cov tshuaj cellulose ether tuaj yeem khaws cov dej thiab tsis yooj yim ploj tom qab sib xyaw rau hauv mortar, thiab yuav maj mam tso tawm hauv lub sijhawm ntev, uas ua rau lub sijhawm ua haujlwm ntawm lub mortar. thiab muab cov mortar zoo khaws cia thiab ua haujlwm.
1.2.3 Ntau qhov tseem ceeb ntawm kev tsim kho qib cellulose ethers
1. Methyl Cellulose (MC)
Tom qab cov paj rwb refined raug kho nrog alkali, methyl chloride yog siv los ua tus neeg sawv cev etherifying los ua cellulose ether los ntawm cov tshuaj tiv thaiv. Qhov kev hloov pauv dav dav yog 1. Melting 2.0, qhov degree ntawm kev hloov pauv txawv thiab cov solubility kuj txawv. belongs rau non-ionic cellulose ether.
2. Hydroxyethyl Cellulose (HEC)
Nws yog npaj los ntawm reacting nrog ethylene oxide raws li ib tug etherifying tus neeg sawv cev nyob rau hauv lub xub ntiag ntawm acetone tom qab lub refined paj rwb yog kho nrog alkali. Qhov kev hloov pauv feem ntau yog 1.5 txog 2.0. Nws muaj zog hydrophilicity thiab yooj yim rau nqus noo noo.
3. Hydroxypropyl methylcellulose (HPMC)
Hydroxypropyl methylcellulose yog ib hom cellulose uas nws cov zis thiab noj tau nce sai heev hauv xyoo tas los no. Nws yog non-ionic cellulose tov ether ua los ntawm refined paj rwb tom qab kho alkali, siv propylene oxide thiab methyl chloride ua etherifying agents, thiab los ntawm ib tug series ntawm cov tshuaj tiv thaiv. Qhov kev hloov pauv feem ntau yog 1.2 txog 2.0. Nws cov khoom sib txawv raws li qhov sib piv ntawm cov ntsiab lus methoxyl thiab hydroxypropyl cov ntsiab lus.
4. Carboxymethylcellulose (CMC)
Ionic cellulose ether yog npaj los ntawm ntuj fibers (paj rwb, thiab lwm yam) tom qab alkali kev kho mob, siv sodium monochloroacetate ua ib tug etherifying tus neeg saib xyuas, thiab los ntawm ib tug series ntawm cov tshuaj tiv thaiv. Qhov kev hloov pauv feem ntau yog 0.4-d. 4. Nws qhov kev ua tau zoo heev cuam tshuam los ntawm qib kev hloov pauv.
Ntawm lawv, hom thib peb thiab plaub yog ob hom cellulose siv hauv qhov kev sim no.
1.2.4 Kev Txhim Kho ntawm Cellulose Ether Kev Lag Luam
Tom qab xyoo ntawm txoj kev loj hlob, kev lag luam cellulose ether nyob rau hauv cov teb chaws tsim tau dhau los ua neeg paub tab, thiab kev lag luam hauv cov teb chaws tseem tab tom loj hlob, uas yuav dhau los ua lub zog tseem ceeb rau kev loj hlob ntawm ntiaj teb cellulose ether noj yav tom ntej. Tam sim no, tag nrho lub ntiaj teb no muaj peev xwm ntawm cellulose ether tshaj 1 lab tons, nrog rau cov teb chaws Europe accounting rau 35% ntawm tag nrho cov thoob ntiaj teb noj, raws li Asia thiab North America. Carboxymethyl cellulose ether (CMC) yog hom neeg siv khoom loj, suav txog 56% ntawm tag nrho, ua raws li methyl cellulose ether (MC/HPMC) thiab hydroxyethyl cellulose ether (HEC), suav txog 56% ntawm tag nrho. 25% thiab 12%. Kev lag luam txawv teb chaws cellulose ether muaj kev sib tw heev. Tom qab ntau qhov kev sib koom ua ke, cov khoom tsim tawm yog tsom rau ntau lub tuam txhab loj, xws li Dow Chemical Company thiab Hercules Company hauv Tebchaws Meskas, Akzo Nobel hauv Netherlands, Noviant hauv Finland thiab DAICEL hauv Nyiv, thiab lwm yam.
kuv lub teb chaws yog cov neeg tsim khoom loj tshaj plaws hauv ntiaj teb thiab cov neeg siv khoom ntawm cellulose ether, nrog qhov nruab nrab txhua xyoo kev loj hlob ntawm ntau tshaj 20%. Raws li kev txheeb cais ua ntej, muaj txog 50 cellulose ether cov tuam txhab tsim khoom hauv Suav teb. Cov tsim tsim muaj peev xwm ntawm cov cellulose ether kev lag luam tau tshaj 400,000 tons, thiab muaj txog 20 lub tuam txhab uas muaj peev xwm ntawm ntau tshaj 10,000 tons, feem ntau nyob rau hauv Shandong, Hebei, Chongqing thiab Jiangsu. , Zhejiang, Shanghai thiab lwm qhov chaw. Nyob rau hauv 2011, Tuam Tshoj lub CMC muaj peev xwm ntau lawm txog 300,000 tons. Nrog rau qhov kev thov ntau ntxiv rau cov khoom lag luam zoo cellulose ethers hauv cov tshuaj, khoom noj, tshuaj txhua hnub thiab lwm yam kev lag luam hauv xyoo tas los no, kev thov hauv tsev rau lwm cov khoom siv cellulose ether uas tsis yog CMC yog nce. Loj dua, lub peev xwm ntawm MC / HPMC yog kwv yees li 120,000 tons, thiab lub peev xwm ntawm HEC yog li 20,000 tons. PAC tseem nyob rau theem ntawm kev nce qib thiab thov hauv Suav teb. Nrog rau kev loj hlob ntawm cov roj av loj loj thiab kev tsim cov khoom siv hauv tsev, khoom noj khoom haus, tshuaj thiab lwm yam kev lag luam, cov nyiaj thiab kev lag luam ntawm PAC tau nce thiab nthuav tawm txhua xyoo, nrog lub peev xwm tsim tau ntau dua 10,000 tons.
1.3Kev tshawb fawb txog kev siv cellulose ether rau mortar
Hais txog engineering daim ntawv thov kev tshawb fawb ntawm cellulose ether hauv kev tsim kho kev lag luam, cov kws tshawb fawb hauv tsev thiab txawv teb chaws tau ua ntau qhov kev tshawb fawb thiab kev tshawb fawb txog kev siv tshuab.
1.3.1Kev qhia luv luv ntawm kev tshawb fawb txawv teb chaws ntawm kev siv cellulose ether rau mortar
Laetitia Patural, Philippe Marchal thiab lwm tus hauv Fab Kis tau taw qhia tias cellulose ether muaj qhov cuam tshuam loj rau cov dej khaws cia ntawm cov mortar, thiab cov txheej txheem tsis sib xws yog tus yuam sij, thiab qhov hnyav molecular yog tus yuam sij los tswj cov dej tuav thiab sib xws. Nrog rau qhov nce ntawm qhov hnyav molecular, cov txiaj ntsig kev ntxhov siab txo qis, qhov sib xws nce, thiab cov dej tuav tau nce ntxiv; ntawm qhov tsis sib xws, cov qib molar hloov pauv (txog rau cov ntsiab lus ntawm hydroxyethyl lossis hydroxypropyl) tsis tshua muaj txiaj ntsig rau cov dej tuav ntawm cov tshuaj khib nyiab qhuav. Txawm li cas los xij, cellulose ethers nrog qis molar degrees ntawm kev hloov pauv tau txhim kho dej tuav.
Lub ntsiab lus tseem ceeb ntawm cov dej tuav cov txheej txheem yog tias cov khoom rheological ntawm cov mortar yog qhov tseem ceeb. Nws tuaj yeem pom los ntawm cov txiaj ntsig kev sim uas rau cov tshuaj khib nyiab qhuav nrog cov dej ruaj khov-cement piv thiab cov ntsiab lus sib xyaw, cov dej tuav kev ua haujlwm feem ntau muaj tib yam li nws qhov sib xws. Txawm li cas los xij, rau qee cov cellulose ethers, cov qauv tsis pom tseeb; Tsis tas li ntawd, rau cov hmoov txhuv nplej siab ethers, muaj qhov sib txawv. Lub viscosity ntawm cov khoom sib xyaw tshiab tsis yog tib qho kev ntsuas rau kev txiav txim siab khaws dej.
Laetitia Patural, Patrice Potion, thiab al., nrog kev pab los ntawm pulsed teb gradient thiab MRI cov tswv yim, pom tau hais tias cov ya raws tsiv teb tsaws ntawm lub interface ntawm mortar thiab unsaturated substrate yog cuam tshuam los ntawm qhov sib ntxiv ntawm ib tug me me ntawm CE. Kev poob dej yog vim kev ua ntawm capillary es tsis yog dej diffusion. Moisture migration los ntawm capillary kev txiav txim yog tswj hwm los ntawm substrate micropore siab, uas nyob rau hauv lem yog txiav txim los ntawm micropore loj thiab Laplace txoj kev xav interfacial nro, nrog rau cov kua viscosity. Qhov no qhia tau hais tias cov khoom rheological ntawm CE aqueous tov yog tus yuam sij rau kev tuav dej. Txawm li cas los xij, qhov kev xav no cuam tshuam qee qhov kev pom zoo (lwm cov tackifiers xws li siab molecular polyethylene oxide thiab starch ethers tsis zoo li CE).
Jean. Yves Petit, Erie Wirquin et al. siv cellulose ether los ntawm kev sim, thiab nws 2% kua viscosity yog los ntawm 5000 txog 44500mpa. S xws li MC thiab HEMC. Nrhiav:
1. Rau cov nqi ruaj khov ntawm CE, hom CE muaj kev cuam tshuam zoo rau cov viscosity ntawm cov nplaum nplaum rau cov vuas. Qhov no yog vim muaj kev sib tw ntawm CE thiab dispersible polymer hmoov rau adsorption ntawm cement hais.
2. Kev sib tw adsorption ntawm CE thiab roj hmab hmoov muaj txiaj ntsig zoo rau lub sijhawm teem thiab spalling thaum lub sijhawm tsim kho yog 20-30min.
3. Lub zog ntawm daim ntawv cog lus yog cuam tshuam los ntawm kev sib koom ua ke ntawm CE thiab roj hmab hmoov. Thaum CE zaj duab xis tsis tuaj yeem tiv thaiv cov evaporation ntawm noo noo ntawm qhov sib txuas ntawm cov pobzeb thiab cov mortar, qhov adhesion nyob rau hauv kub curing txo qis.
4. Kev sib koom tes thiab kev sib cuam tshuam ntawm CE thiab dispersible polymer hmoov yuav tsum tau muab rau hauv kev txiav txim siab thaum tsim qhov feem ntawm cov nplaum nplaum rau cov vuas.
Lub teb chaws Yelemees LschmitzC. J. Dr. H(a)cker tau hais hauv tsab xov xwm tias HPMC thiab HEMC hauv cellulose ether muaj lub luag haujlwm tseem ceeb hauv kev khaws dej hauv cov tshuaj khib nyiab qhuav. Ntxiv nrog rau kev ua kom cov dej ruaj khov ntawm cov cellulose ether, nws raug nquahu kom siv cov Cellulose ethers hloov kho thiab txhim kho cov khoom ua haujlwm ntawm mortar thiab cov khoom ntawm cov tshuaj khib nyiab qhuav thiab tawv tawv.
1.3.2Kev qhia luv luv ntawm kev tshawb fawb hauv tsev ntawm kev siv cellulose ether rau mortar
Xin Quanchang los ntawm Xi'an University of Architecture thiab Technology tau kawm txog kev cuam tshuam ntawm ntau yam polymers ntawm qee yam khoom ntawm kev sib txuas mortar, thiab pom tias kev sib xyaw siv cov hmoov polymer dispersible thiab hydroxyethyl methyl cellulose ether tsis tuaj yeem txhim kho kev ua tau zoo ntawm kev sib koom ua ke mortar, tab sis kuj tuaj yeem ua ib feem ntawm tus nqi txo; Cov txiaj ntsig kev ntsuam xyuas pom tau tias thaum cov ntsiab lus ntawm redispersible latex hmoov yog tswj ntawm 0.5%, thiab cov ntsiab lus ntawm hydroxyethyl methyl cellulose ether yog tswj ntawm 0.2%, lub mortar npaj yog resistant rau dabtsi yog khoov. thiab kev sib txuas lub zog yog qhov tseem ceeb dua, thiab muaj qhov yooj yim thiab plasticity.
Xib fwb Ma Baoguo los ntawm Wuhan University of Technology tau taw qhia tias cellulose ether muaj cov nyhuv retardation pom tseeb, thiab tuaj yeem cuam tshuam rau cov qauv ntawm cov khoom siv dej thiab cov pore qauv ntawm cov cement slurry; cellulose ether feem ntau yog adsorbed rau saum npoo ntawm cov cement hais los ua ib qho kev cuam tshuam. Nws cuam tshuam cov nucleation thiab kev loj hlob ntawm cov khoom hydration; Ntawm qhov tod tes, cellulose ether cuam tshuam kev tsiv teb tsaws thiab kev nthuav dav ntawm ions vim nws qhov pom tseeb viscosity nce cov nyhuv, yog li ncua cov dej ntawm cov cement mus rau qee yam; cellulose ether muaj alkali stability.
Jian Shouwei los ntawm Wuhan University of Technology tau xaus lus tias lub luag haujlwm ntawm CE hauv mortar feem ntau yog tshwm sim hauv peb yam: cov dej tuav tau zoo, cuam tshuam rau cov tshuaj khib nyiab sib xws thiab thixotropy, thiab kev hloov kho ntawm rheology. CE tsis tsuas yog muab cov tshuaj khib nyiab ua haujlwm zoo xwb, tab sis kuj txhawm rau txo qis cov dej kub thaum ntxov ntawm cov cement thiab ncua cov txheej txheem dej kinetic ntawm cov cement, tau kawg, raws li kev siv sib txawv ntawm mortar, kuj tseem muaj qhov sib txawv ntawm nws txoj kev ntsuas kev ua haujlwm. .
CE hloov mortar yog siv nyob rau hauv daim ntawv ntawm nyias-txheej mortar nyob rau hauv txhua txhua hnub qhuav-siv mortar (xws li cib binder, putty, nyias-txheej plastering mortar, thiab lwm yam). Cov qauv tshwj xeeb no feem ntau yog nrog los ntawm kev poob dej sai ntawm cov mortar. Tam sim no, kev tshawb fawb tseem ceeb tsom mus rau lub ntsej muag pobzeb nplaum, thiab tsis tshua muaj kev tshawb fawb txog lwm hom nyias-txheej CE hloov mortar.
Su Lei los ntawm Wuhan University of Technology tau txais los ntawm kev sim tshuaj ntsuam xyuas ntawm cov dej khaws cia, dej poob thiab teeb tsa lub sijhawm ntawm cov mortar hloov nrog cellulose ether. Tus nqi ntawm cov dej txo qis, thiab lub sijhawm coagulation yog ntev; thaum cov dej nce mus txog O. Tom qab 6%, qhov kev hloov ntawm cov dej tuav thiab cov dej poob tsis pom tseeb lawm, thiab lub sij hawm teeb tsa yog ze li ob npaug; thiab txoj kev tshawb fawb ntawm nws lub zog compressive qhia tau hais tias thaum cov ntsiab lus ntawm cellulose ether qis dua 0.8%, cov ntsiab lus ntawm cellulose ether tsawg dua 0.8%. Qhov nce yuav txo qhov compressive zog; thiab nyob rau hauv cov nqe lus ntawm kev sib koom ua ke nrog cov cement mortar board, O. Hauv qab 7% ntawm cov ntsiab lus, qhov nce ntawm cov ntsiab lus ntawm cellulose ether tuaj yeem txhim kho kev sib raug zoo.
Lai Jianqing ntawm Xiamen Hongye Engineering Construction Technology Co., Ltd. soj ntsuam thiab xaus lus tias qhov kev pom zoo ntawm cellulose ether thaum txiav txim siab txog cov dej tuav thiab qhov ntsuas qhov sib xws yog 0 los ntawm kev ntsuam xyuas ntawm cov dej tuav tus nqi, lub zog thiab daim ntawv cog lus lub zog. EPS thermal rwb thaiv tsev mortar. 2% yog '; cellulose ether muaj zog cua-entraining nyhuv, uas yuav ua rau ib tug txo nyob rau hauv lub zog, tshwj xeeb tshaj yog ib tug txo nyob rau hauv tensile daim ntawv cog lus zog, yog li nws yog pom zoo kom siv nws ua ke nrog redispersible polymer hmoov.
Yuan Wei thiab Qin Min ntawm Xinjiang Lub Tsev Cov Khoom Siv Tshawb Fawb tau ua qhov kev sim thiab kev tshawb fawb ntawm cellulose ether hauv cov pob zeb ua npuas. Cov txiaj ntsig kev sim qhia tau hais tias HPMC txhim kho cov dej khaws cia ntawm cov ua npuas ncauj tshiab thiab txo cov dej poob ntawm cov pob zeb tawv tawv; HPMC tuaj yeem txo qhov poob qis ntawm cov ua npuas ncauj tshiab thiab txo qhov rhiab heev ntawm qhov sib xyaw kom sov. ; HPMC yuav txo qhov compressive zog ntawm cov pob zeb ua npuas ncauj. Nyob rau hauv tej yam ntuj tso curing tej yam kev mob, ib tug npaum li cas ntawm HPMC tuaj yeem txhim kho lub zog ntawm cov qauv mus rau ib qho twg.
Li Yuhai ntawm Wacker Polymer Materials Co., Ltd. tau taw qhia tias hom thiab ntau npaum li cas ntawm cov hmoov latex, hom cellulose ether thiab curing ib puag ncig muaj kev cuam tshuam tseem ceeb ntawm kev cuam tshuam ntawm plastering mortar. Cov txiaj ntsig ntawm cellulose ethers ntawm kev cuam tshuam lub zog kuj tseem tsis txaus ntseeg piv rau cov ntsiab lus polymer thiab kho cov mob.
Yin Qingli ntawm AkzoNobel Specialty Chemicals (Shanghai) Co., Ltd. siv Bermocoll PADl, tshwj xeeb hloov polystyrene board bonding cellulose ether, rau kev sim, uas yog tshwj xeeb tshaj yog haum rau lub tsev cog khoom mortar ntawm EPS sab nrauv phab ntsa rwb thaiv tsev system. Bermocoll PADl tuaj yeem txhim kho lub zog sib txuas ntawm mortar thiab polystyrene board ntxiv rau txhua txoj haujlwm ntawm cellulose ether. Txawm hais tias qhov tsawg npaum li cas, nws tuaj yeem tsis tsuas yog txhim kho cov dej tuav thiab kev ua haujlwm ntawm cov mortar tshiab, tab sis kuj tuaj yeem txhim kho qhov qub kev sib raug zoo thiab cov dej-resistant bonding zog ntawm mortar thiab polystyrene board vim qhov tshwj xeeb anchoring. tshuab. . Txawm li cas los xij, nws tsis tuaj yeem txhim kho qhov cuam tshuam ntawm mortar thiab kev sib koom ua ke nrog polystyrene board. Txhawm rau txhim kho cov khoom no, yuav tsum tau siv cov hmoov redispersible latex.
Wang Peiming los ntawm Tongji University tau tshuaj xyuas keeb kwm kev loj hlob ntawm kev lag luam mortar thiab taw qhia tias cellulose ether thiab latex hmoov muaj qhov cuam tshuam tsis zoo rau cov ntsuas kev ua tau zoo xws li dej tuav, flexural thiab compressive zog, thiab elastic modulus ntawm qhuav hmoov coj mus muag mortar.
Zhang Lin thiab lwm tus ntawm Shantou Special Economic Zone Longhu Technology Co., Ltd. tau xaus lus tias, nyob rau hauv lub tsev cog khoom mortar ntawm nthuav polystyrene board nyias plastering sab nrauv phab ntsa sab nrauv thermal rwb thaiv tsev system (ie Eqos system), nws yog pom zoo kom tus nqi zoo. roj hmab hmoov yog 2.5% yog qhov txwv; Tsis tshua muaj viscosity, hloov kho cellulose ether yog qhov kev pab zoo rau kev txhim kho cov pab pawg tensile zog ntawm cov tshuaj khib nyiab.
Zhao Lujun ntawm Shanghai Lub Tsev Haujlwm ntawm Kev Tshawb Fawb Kev Ua Haujlwm Hauv Tsev, thiab siv tau ntau lub cug cug, thiab lub teeb tsa dav dav lub sijhawm mortar. Nyob rau tib lub sijhawm, cellulose ether nrog cov viscosity siab yog qhov zoo rau kev txhim kho cov dej tuav tus nqi ntawm mortar, tab sis lub zog compressive txo qis dua thiab lub sijhawm teem sijhawm ntev dua. Thickening hmoov thiab cellulose ether tshem tawm cov yas shrinkage cracking ntawm mortar los ntawm kev txhim kho cov dej tuav ntawm mortar.
Fuzhou University Huang Lipin thiab al tau kawm txog doping ntawm hydroxyethyl methyl cellulose ether thiab ethylene. Lub cev muaj zog thiab kev sib tshuam morphology ntawm hloov cov cement mortar ntawm vinyl acetate copolymer latex hmoov. Nws tau pom tias cellulose ether muaj cov dej tuav tau zoo, kev nqus dej tsis zoo thiab cov txiaj ntsig zoo ntawm huab cua, thaum lub zog txo cov dej ntawm cov hmoov latex thiab kev txhim kho cov khoom siv ntawm cov tshuaj khib nyiab yog qhov tshwj xeeb. Hloov cov nyhuv; thiab muaj ntau npaum li cas ntawm cov polymers.
Los ntawm kev sim ntau, Chen Qian thiab lwm tus los ntawm Hubei Baoye Siv Kev Tsim Kho Kev Lag Luam Co., Ltd. tau ua pov thawj tias txuas ntxiv lub sijhawm nplawm thiab ua kom nrawm nrawm tuaj yeem muab kev ua si tag nrho rau lub luag haujlwm ntawm cellulose ether nyob rau hauv cov khoom sib xyaw ua ke, txhim kho cov khoom siv. workability ntawm mortar, thiab txhim kho lub sij hawm stirring. luv luv lossis qeeb qeeb yuav ua rau lub mortar nyuaj rau kev tsim; xaiv txoj cai cellulose ether tuaj yeem txhim kho kev ua haujlwm ntawm cov khoom sib xyaw npaj txhij.
Li Sihan los ntawm Shenyang Jianzhu University thiab lwm tus tau pom tias cov khoom siv ntxhia tuaj yeem txo qhov qhuav shrinkage deformation ntawm mortar thiab txhim kho nws cov khoom siv kho tshuab; qhov sib piv ntawm txiv qaub rau xuab zeb muaj kev cuam tshuam rau cov khoom siv kho tshuab thiab shrinkage tus nqi ntawm mortar; redispersible polymer hmoov tuaj yeem txhim kho lub mortar. Crack kuj, txhim kho adhesion, flexural zog, cohesion, cuam tshuam thiab hnav tsis kam, txhim kho dej tuav thiab ua haujlwm; cellulose ether muaj huab cua-entraining nyhuv, uas tuaj yeem txhim kho cov dej tuav ntawm mortar; ntoo fiber ntau tuaj yeem txhim kho mortar Txhim kho qhov yooj yim ntawm kev siv, kev ua haujlwm, thiab kev ua haujlwm tsis zoo, thiab kev tsim kho kom nrawm. Los ntawm kev ntxiv ntau yam admixtures rau kev hloov kho, thiab los ntawm qhov tsim nyog piv, tawg-resistant mortar rau sab nrauv phab ntsa thermal rwb thaiv tsev nrog kev ua tau zoo heev tuaj yeem npaj tau.
Yang Lei ntawm Henan University of Technology tau sib xyaw HEMC rau hauv mortar thiab pom tias nws muaj ob txoj haujlwm ntawm cov dej tuav thiab thickening, uas tiv thaiv cov huab cua-entrained pob zeb los ntawm sai absorbing dej nyob rau hauv lub plastering mortar, thiab xyuas kom meej tias cov cement nyob rau hauv lub pob zeb. mortar yog tag nrho hydrated, ua rau lub mortar Kev sib xyaw nrog aerated qhob yog denser thiab daim ntawv cog lus muaj zog dua; nws tuaj yeem txo qhov delamination ntawm plastering mortar rau aerated qhob. Thaum HEMC tau ntxiv rau hauv mortar, lub zog flexural ntawm lub mortar txo qis me ntsis, thaum lub zog compressive txo qis heev, thiab qhov sib piv-compression piv nkhaus pom qhov nce siab, qhia tias qhov sib ntxiv ntawm HEMC tuaj yeem txhim kho qhov toughness ntawm mortar.
Li Yanling thiab lwm tus los ntawm Henan University of Technology tau pom tias cov khoom siv ntawm cov tshuaj khib nyiab tau txhim kho zoo dua piv nrog cov tshuaj khib nyiab zoo tib yam, tshwj xeeb tshaj yog cov ntawv cog lus lub zog ntawm cov tshuaj khib nyiab, thaum cov khoom sib xyaw ntxiv (cov ntsiab lus ntawm cellulose ether yog 0.15%). Nws yog 2.33 npaug ntawm cov mortar zoo tib yam.
Ma Baoguo los ntawm Wuhan University of Technology thiab lwm tus tau kawm txog cov teebmeem ntawm ntau npaum li cas ntawm styrene-acrylic emulsion, dispersible polymer hmoov, thiab hydroxypropyl methylcellulose ether ntawm cov dej noj, daim ntawv cog lus lub zog thiab toughness ntawm nyias plastering mortar. , pom tias thaum cov ntsiab lus ntawm styrene-acrylic emulsion yog 4% mus rau 6%, cov nyiaj cog lus lub zog ntawm mortar mus txog qhov zoo tshaj plaws tus nqi, thiab compression-folding piv yog qhov tsawg tshaj plaws; cov ntsiab lus ntawm cellulose ether nce mus rau O. Ntawm 4%, cov nyiaj cog lus lub zog ntawm mortar ncav cuag saturation, thiab compression-folding piv yog qhov tsawg tshaj plaws; Thaum cov ntsiab lus ntawm roj hmab hmoov yog 3%, lub zog sib txuas ntawm mortar yog qhov zoo tshaj plaws, thiab qhov sib piv-folding txo qis nrog qhov sib ntxiv ntawm cov hmoov roj hmab. sib.
Li Qiao thiab lwm tus ntawm Shantou Special Economic Zone Longhu Technology Co., Ltd. tau taw qhia hauv tsab xov xwm hais tias cov haujlwm ntawm cellulose ether hauv cov cement mortar yog dej tuav, thickening, cua nkag, retardation thiab txhim kho tensile daim ntawv cog lus lub zog, thiab lwm yam. Kev ua haujlwm sib raug rau Thaum kuaj thiab xaiv MC, cov ntsuas ntawm MC uas yuav tsum tau txiav txim siab suav nrog viscosity, qib ntawm etherification hloov, qib kev hloov kho, khoom ruaj khov, cov ntsiab lus zoo, particle loj thiab lwm yam. Thaum xaiv MC nyob rau hauv cov khoom sib txawv mortar, cov kev ua tau zoo ntawm MC nws tus kheej yuav tsum tau muab tso rau pem hauv ntej raws li kev tsim kho thiab siv cov kev cai ntawm cov khoom mortar tshwj xeeb, thiab cov khoom tsim nyog MC yuav tsum raug xaiv ua ke nrog cov muaj pes tsawg leeg thiab cov ntsiab lus ntsuas ntawm MC.
Qiu Yongxia ntawm Beijing Wanbo Huijia Science thiab Trade Co., Ltd. pom tau hais tias nrog kev nce ntawm cov viscosity ntawm cellulose ether, cov dej tuav tus nqi ntawm cov mortar nce; qhov zoo dua cov khoom ntawm cellulose ether, qhov zoo dua cov dej tuav; Qhov siab dua cov dej tuav tus nqi ntawm cellulose ether; Cov dej tuav ntawm cellulose ether txo qis nrog qhov nce ntawm qhov kub thiab txias.
Zhang Bin ntawm Tongji University thiab lwm tus tau taw qhia nyob rau hauv tsab xov xwm hais tias cov yam ntxwv ntawm kev hloov kho mortar yog ze ze rau kev txhim kho viscosity ntawm cellulose ethers, tsis yog tias cov cellulose ethers nrog siab nominal viscosity muaj kev cuam tshuam rau cov yam ntxwv ua haujlwm, vim lawv yog kuj cuam tshuam los ntawm particle loj. , dissolution tus nqi thiab lwm yam.
Zhou Xiao thiab lwm tus los ntawm Lub Tsev Haujlwm Saib Xyuas Kev Cai Lij Choj Kev Tiv Thaiv Kev Tshawb Fawb thiab thev naus laus zis, Tuam Tshoj Cultural Heritage Research Institute tau kawm txog kev koom tes ntawm ob qho khoom ntxiv, polymer roj hmab hmoov thiab cellulose ether, rau lub zog ntawm daim ntawv cog lus hauv NHL (hydraulic txiv qaub) mortar system, thiab pom tias qhov yooj yim Vim lub shrinkage ntau dhau ntawm hydraulic txiv qaub, nws tsis tuaj yeem tsim lub zog tensile txaus nrog lub pob zeb cuam tshuam. Qhov tsim nyog ntawm cov roj hmab roj hmab hmoov thiab cellulose ether tuaj yeem txhim kho lub zog sib txuas ntawm NHL mortar thiab ua tau raws li cov kev cai ntawm kev coj noj coj ua thiab kev tiv thaiv cov ntaub ntawv; txhawm rau tiv thaiv Nws muaj kev cuam tshuam rau cov dej permeability thiab breathability ntawm NHL mortar nws tus kheej thiab kev sib raug zoo nrog masonry kab lis kev cai relics. Nyob rau tib lub sijhawm, xav txog kev sib koom ua ke ntawm NHL mortar, qhov zoo tagnrho ntxiv ntawm cov roj hmab roj hmab hmoov yog qis dua 0.5% mus rau 1%, thiab qhov sib ntxiv ntawm cellulose ether Tus nqi yog tswj ntawm li 0.2%.
Duan Pengxuan thiab lwm tus los ntawm lub koom haum Beijing Institute of Building Materials Science tau ua ob tus kheej tsim cov rheological testers los ntawm kev tsim cov qauv rheological ntawm cov mortar tshiab, thiab ua rheological tsom xam ntawm cov khoom siv pob zeb zoo tib yam, plastering mortar thiab plastering gypsum khoom. Lub denaturation tau ntsuas, thiab nws tau pom tias hydroxyethyl cellulose ether thiab hydroxypropyl methyl cellulose ether muaj qhov pib zoo dua tus nqi viscosity thiab viscosity txo kev ua tau zoo nrog lub sij hawm thiab ceev nce, uas tuaj yeem txhawb cov binder rau hom kev sib txuas zoo dua, thixotropy thiab plam tsis kam.
Li Yanling ntawm Henan University of Technology thiab lwm tus pom tias qhov sib ntxiv ntawm cellulose ether nyob rau hauv mortar tuaj yeem txhim kho cov dej khaws cia ntawm cov mortar, yog li ua kom muaj kev vam meej ntawm cov cement hydration. Txawm hais tias qhov sib ntxiv ntawm cellulose ether txo lub zog flexural thiab compressive lub zog ntawm lub mortar, nws tseem ua rau cov flexural-compression piv thiab cov ntawv cog lus lub zog ntawm mortar rau qee yam.
1.4Kev tshawb fawb txog kev siv cov khoom sib tov rau cov tshuaj khib hauv tsev thiab txawv teb chaws
Hauv kev lag luam niaj hnub no, kev tsim khoom thiab kev siv cov pob zeb thiab mortar yog qhov loj, thiab qhov kev thov rau cov cement kuj nce ntxiv. Kev tsim cov cement yog kev siv hluav taws xob siab thiab kev lag luam muaj kuab paug siab. Txuag cement yog qhov tseem ceeb heev los tswj cov nqi thiab tiv thaiv ib puag ncig. Raws li ib feem ntawm cov cement, ntxhia admixture tuaj yeem tsis tsuas yog txhim kho kev ua haujlwm ntawm mortar thiab pob zeb, tab sis kuj txuag tau ntau cov cement nyob rau hauv cov xwm txheej ntawm kev siv tsim nyog.
Hauv kev lag luam khoom siv hauv tsev, kev siv cov khoom sib xyaw ua ke tau dav heev. Ntau ntau hom cement muaj ntau lossis tsawg dua ib qho ntawm cov khoom sib xyaw. Ntawm lawv, feem ntau siv dav Portland cement yog ntxiv 5% hauv kev tsim khoom. ~ 20% admixture. Nyob rau hauv cov txheej txheem ntau lawm ntawm ntau yam mortar thiab qhob ntau lawm tuam txhab, daim ntawv thov ntawm admixtures yog dav dua.
Rau kev siv cov khoom sib xyaw hauv mortar, kev tshawb fawb ntev thiab dav tau ua nyob hauv tsev thiab txawv teb chaws.
1.4.1Cov lus qhia luv luv ntawm kev tshawb fawb txawv teb chaws ntawm kev sib xyaw siv rau mortar
P. University of California. JM Momeiro Joe IJ K. Wang et al. pom tias nyob rau hauv cov txheej txheem hydration ntawm cov khoom siv gelling, gel tsis swelled nyob rau hauv sib npaug ntim, thiab cov ntxhia admixture tuaj yeem hloov cov hydrated gel, thiab pom tias qhov o ntawm cov gel muaj feem xyuam rau cov divalent cations hauv cov gel. . Tus naj npawb ntawm cov ntawv luam pom muaj qhov cuam tshuam tsis zoo.
Kevin J., USA. Folliard thiab Makoto Ohta et al. taw qhia tias qhov sib ntxiv ntawm silica fume thiab mov husk tshauv rau hauv mortar tuaj yeem txhim kho lub zog compressive, thaum ntxiv ntawm ya tshauv txo lub zog, tshwj xeeb tshaj yog nyob rau theem pib.
Philippe Lawrence thiab Martin Cyr ntawm Fabkis tau pom tias muaj ntau yam minerals admixtures tuaj yeem txhim kho lub mortar zog raws li qhov tsim nyog. Qhov sib txawv ntawm cov ntxhia sib txawv yog tsis pom tseeb nyob rau theem pib ntawm hydration. Nyob rau theem tom ntej ntawm hydration, qhov ntxiv zog ntxiv yog cuam tshuam los ntawm kev ua haujlwm ntawm cov ntxhia sib xyaw, thiab lub zog nce los ntawm inert admixture tsis tuaj yeem suav tias yog sau. cov nyhuv, tab sis yuav tsum tau ntaus nqi rau lub cev cov nyhuv ntawm multiphase nucleation.
Bulgaria's ValIly0 Stoitchkov Stl Petar Abadjiev thiab lwm tus pom tias cov khoom siv hauv paus yog silica fume thiab qis-calcium ya tshauv los ntawm lub cev thiab cov khoom siv ntawm cov cement mortar thiab pob zeb sib xyaw nrog cov khoom siv pozzolanic, uas tuaj yeem txhim kho lub zog ntawm cov cement pob zeb. Silica fume muaj qhov cuam tshuam tseem ceeb ntawm cov dej thaum ntxov ntawm cov ntaub ntawv cementitious, thaum cov hmoov tshauv ya ya muaj qhov cuam tshuam tseem ceeb rau cov dej tom qab.
1.4.2Cov lus qhia luv luv ntawm kev tshawb fawb hauv tsev ntawm kev siv cov khoom sib xyaw rau mortar
Los ntawm kev tshawb fawb soj ntsuam, Zhong Shiyun thiab Xiang Keqin ntawm Tongji University pom tias cov khoom sib xyaw hloov kho ntawm cov hmoov tshauv ya thiab polyacrylate emulsion (PAE), thaum qhov sib piv poly-binder tau kho ntawm 0.08, compression-folding piv ntawm mortar nce nrog Lub fineness thiab cov ntsiab lus ntawm yoov tshauv txo nrog qhov nce ntawm ya tshauv. Nws tau npaj siab tias qhov sib ntxiv ntawm cov tshauv ya tuaj yeem daws tau qhov teeb meem ntawm tus nqi siab ntawm kev txhim kho qhov hloov pauv ntawm cov mortar los ntawm kev nce cov ntsiab lus ntawm polymer.
Wang Yinong ntawm Wuhan Iron thiab Steel Civil Siv Lub Tuam Txhab tau kawm txog kev ua haujlwm siab mortar admixture, uas tuaj yeem txhim kho kev ua haujlwm ntawm mortar, txo qhov degree ntawm delamination, thiab txhim kho kev sib koom ua ke. Nws yog tsim rau masonry thiab plastering ntawm aerated qhob blocks. .
Chen Miaomiao thiab lwm tus los ntawm Nanjing University of Technology tau kawm txog cov txiaj ntsig ntawm ob qhov sib xyaw ya tshauv thiab ntxhia hmoov hauv mortar qhuav ntawm kev ua haujlwm thiab cov khoom siv ntawm cov tshuaj khib nyiab, thiab pom tias qhov sib ntxiv ntawm ob qhov sib xyaw tsis tsuas yog txhim kho kev ua haujlwm thiab cov khoom siv kho tshuab. ntawm qhov sib tov. Lub cev thiab cov khoom siv kho tshuab kuj tuaj yeem txo tus nqi zoo. Qhov pom zoo kom noj ntau npaum li cas yog hloov 20% ntawm ya tshauv thiab ntxhia hmoov raws li qhov sib piv ntawm mortar rau xuab zeb yog 1: 3, thiab qhov sib piv ntawm cov dej rau cov khoom yog 0.16.
Zhuang Zihao los ntawm South Tuam Tshoj University of Technology kho cov dej-binder piv, hloov kho bentonite, cellulose ether thiab roj hmab hmoov, thiab kawm txog cov khoom ntawm mortar zog, dej tuav thiab qhuav shrinkage ntawm peb ntxhia admixtures, thiab pom tias cov ntsiab lus admixture mus txog. Ntawm 50%, qhov porosity nce ntxiv thiab lub zog txo qis, thiab qhov kev pom zoo ntawm peb cov ntxhia sib xyaw yog 8% limestone hmoov, 30% slag, thiab 4% ya tshauv, uas tuaj yeem ua tiav dej tuav. tus nqi, tus nqi nyiam ntawm kev siv.
Li Ying los ntawm Qinghai University tau ua ib qho kev sim ntawm mortar tov nrog ntxhia admixtures, thiab xaus lus thiab soj ntsuam tias cov ntxhia admixtures tuaj yeem ua kom zoo dua qhov kev ua kom zoo dua qub ntawm cov hmoov, thiab cov nyhuv micro-filling thiab ob qho tib si hydration ntawm admixtures tuaj yeem ua rau qee yam, lub compactness ntawm lub mortar yog nce, yog li ua kom nws lub zog.
Zhao Yujing ntawm Shanghai Baosteel Tshiab Tsev Khoom Co., Ltd. siv txoj kev xav ntawm pob txha toughness thiab puas lub zog los kawm txog cov ntxhia hauv cov khoom sib xyaw ntawm brittleness ntawm pob zeb. Qhov kev ntsuam xyuas qhia tau hais tias cov ntxhia sib tov tuaj yeem txhim kho cov pob txha toughness thiab tawg lub zog ntawm mortar; nyob rau hauv cov ntaub ntawv ntawm tib hom admixture, qhov hloov pauv ntawm 40% ntawm cov ntxhia ntxhia admixture yog qhov zoo tshaj plaws rau cov pob txha toughness thiab tawg zog.
Xu Guangsheng ntawm Henan University tau taw qhia tias thaum thaj chaw tshwj xeeb ntawm cov hmoov ntxhia hmoov tsawg dua E350m2 / l [g, kev ua haujlwm tsawg, 3d lub zog tsuas yog kwv yees li 30%, thiab 28d lub zog loj hlob mus rau 0 ~ 90% ; thaum nyob ntawm 400m2 melon g, lub zog 3d Nws tuaj yeem nyob ze rau 50%, thiab lub zog 28d yog siab dua 95%. Los ntawm qhov kev xav ntawm cov hauv paus ntsiab lus ntawm rheology, raws li kev soj ntsuam ntawm mortar fluidity thiab flow velocity, ob peb cov lus xaus tau kos: ya tshauv cov ntsiab lus hauv qab no 20% tuaj yeem txhim kho mortar fluidity thiab ntws nrawm, thiab cov hmoov ntxhia hauv cov tshuaj hauv qab no. 25%, fluidity ntawm mortar tuaj yeem nce ntxiv tab sis tus nqi ntws tau txo.
Xib fwb Wang Dongmin ntawm Tuam Tshoj University of Mining thiab Technology thiab xibfwb Feng Lufeng ntawm Shandong Jianzhu University tau taw qhia nyob rau hauv tsab xov xwm hais tias pob zeb yog peb-theem cov khoom los ntawm kev xav ntawm cov ntaub ntawv sib xyaw, uas yog cement paste, aggregate, cement paste thiab aggregate. Lub interface hloov chaw ITZ (Interfacial Transition Zone) ntawm kev sib tshuam. ITZ yog thaj chaw muaj dej nplua nuj, qhov sib piv ntawm cov dej hauv zos yog qhov loj heev, qhov porosity tom qab hydration loj, thiab nws yuav ua rau cov calcium hydroxide enrichment. Cov cheeb tsam no feem ntau yuav ua rau muaj kev tawg thaum pib, thiab feem ntau yuav ua rau muaj kev ntxhov siab. Concentration feem ntau txiav txim siab qhov siv. Txoj kev tshawb nrhiav pom tau hais tias qhov sib ntxiv ntawm cov khoom sib xyaw tuaj yeem txhim kho cov dej endocrine hauv thaj chaw hloov pauv, txo qhov tuab ntawm thaj chaw hloov pauv, thiab txhim kho lub zog.
Zhang Jianxin ntawm Chongqing University thiab lwm tus pom tias los ntawm kev hloov kho ntawm methyl cellulose ether, polypropylene fiber, redispersible polymer hmoov, thiab admixtures, qhuav-mixed plastering mortar nrog kev ua tau zoo tuaj yeem npaj tau. Qhuav-mixed crack-resistant plastering mortar muaj kev ua haujlwm zoo, kev sib raug zoo siab thiab kev ua haujlwm tawg zoo. Qhov zoo ntawm nruas thiab tawg yog ib qho teeb meem tshwm sim.
Ren Chuanyao ntawm Zhejiang University thiab lwm tus tau kawm txog cov txiaj ntsig ntawm hydroxypropyl methylcellulose ether ntawm cov khoom ntawm ya tshauv mortar, thiab tshuaj xyuas qhov kev sib raug zoo ntawm cov ntub dej thiab lub zog compressive. Nws tau pom tias ntxiv hydroxypropyl methyl cellulose ether rau hauv cov hmoov tshauv ya ya tuaj yeem txhim kho cov dej khaws cia ntawm mortar, ua kom lub sijhawm sib txuas ntawm mortar, thiab txo qhov ntub dej thiab compressive zog ntawm mortar. Muaj kev sib raug zoo ntawm qhov ntub dej thiab 28d compressive zog. Nyob rau hauv cov xwm txheej ntawm kev paub ntub dej ntom ntom, 28d compressive zog tuaj yeem suav tau los ntawm kev siv cov qauv tsim nyog.
Xibfwb Pang Lufeng thiab Chang Qingshan ntawm Shandong Jianzhu University siv cov qauv tsim qauv los kawm txog kev cuam tshuam ntawm peb qhov sib xyaw ntawm cov hmoov tshauv ya, ntxhia hmoov thiab silica fume ntawm lub zog ntawm cov pob zeb, thiab muab tso rau hauv cov qauv kev kwv yees nrog qee qhov txiaj ntsig los ntawm kev rov qab los. tsom xam. , thiab nws practicability tau txheeb xyuas.
Lub hom phiaj thiab qhov tseem ceeb ntawm txoj kev tshawb no
Raws li ib qho tseem ceeb ntawm cov dej-retaining thickener, cellulose ether yog siv dav hauv kev ua zaub mov, tshuaj khib thiab pob zeb ntau lawm thiab lwm yam lag luam. Raws li ib qho tseem ceeb admixture nyob rau hauv ntau yam mortars, ntau yam cellulose ethers yuav txo tau cov ntshav los ntawm high fluidity mortar, txhim khu lub thixotropy thiab kev tsim smoothness ntawm lub mortar, thiab txhim kho cov dej tuav kev ua tau zoo thiab daim ntawv cog lus lub zog ntawm lub mortar.
Daim ntawv thov ntawm cov ntxhia admixtures yog nce zuj zus, uas tsis tsuas yog daws qhov teeb meem ntawm kev ua lag luam ntau ntawm cov khoom lag luam, txuag av thiab tiv thaiv ib puag ncig, tab sis kuj tuaj yeem hloov pov tseg rau hauv cov khoom muaj nqis thiab tsim cov txiaj ntsig.
Muaj ntau txoj kev tshawb fawb txog cov khoom ntawm ob lub mortars nyob rau hauv tsev thiab txawv teb chaws, tab sis tsis muaj ntau yam kev sim uas muab ob qho tib si ua ke. Lub hom phiaj ntawm daim ntawv no yog sib tov ob peb cellulose ethers thiab ntxhia admixtures rau hauv cov cement paste tib lub sij hawm, siab fluidity mortar thiab yas mortar (noj cov khoom sib txuas ua piv txwv), los ntawm kev tshawb nrhiav cov fluidity thiab ntau yam khoom siv, txoj cai cuam tshuam ntawm ob hom mortars thaum cov khoom sib xyaw ua ke tau sau tseg, uas yuav cuam tshuam rau yav tom ntej cellulose ether. Thiab cov ntawv thov ntxiv ntawm cov ntxhia sib xyaw ua ke muab qee yam siv.
Tsis tas li ntawd, daim ntawv no qhia txog ib txoj hauv kev los kwv yees lub zog ntawm mortar thiab pob zeb ua raws li FERET lub zog txoj kev xav thiab kev ua haujlwm coefficient ntawm cov ntxhia sib xyaw, uas tuaj yeem muab cov lus qhia tseem ceeb rau kev sib xyaw tsim thiab kev kwv yees lub zog ntawm mortar thiab pob zeb.
1.6Cov ntsiab lus tshawb fawb tseem ceeb ntawm daim ntawv no
Cov ntsiab lus tseem ceeb ntawm kev tshawb fawb no muaj xws li:
1. Los ntawm kev sib xyaw ua ke ntawm ntau lub cellulose ethers thiab ntau yam ntxhia admixtures, kev sim ntawm cov kua dej ntawm cov slurry huv si thiab cov kua nplaum uas muaj kuab heev tau ua tiav, thiab cov kev cai cuam tshuam tau sau tseg thiab cov laj thawj raug tshuaj xyuas.
2. Los ntawm kev ntxiv cellulose ethers thiab ntau yam ntxhia admixtures rau high fluidity mortar thiab bonding mortar, tshawb lawv cov teebmeem ntawm compressive zog, flexural zog, compression-folding ratio thiab bonding mortar ntawm high fluidity mortar thiab yas mortar Txoj cai ntawm lub zog ntawm tensile daim ntawv cog lus zog.
3. Ua ke nrog FERET lub zog txoj kev xav thiab kev ua haujlwm coefficient ntawm cov ntxhia sib xyaw, ib txoj kev kwv yees lub zog rau ntau cov khoom siv cementitious mortar thiab pob zeb yog npaj.
Tshooj 2 Kev tshuaj xyuas cov khoom siv raw thiab lawv cov khoom siv rau kev sim
2.1 Cov ntaub ntawv xeem
2.1.1 Cement (C)
Qhov kev sim siv "Shanshui Dongyue" hom PO. 42.5 Cement ib.
2.1.2 Mineral hmoov (KF)
$ 95 qib granulated blast furnace slag hmoov los ntawm Shandong Jinan Luxin New Building Materials Co., Ltd.
2.1.3 Fly Ash (FA)
Qib II ya tshauv tsim los ntawm Jinan Huangtai Fais Fab Cog yog xaiv, qhov zoo (tseem sieve ntawm 459m square qhov sieve) yog 13%, thiab cov dej xav tau piv yog 96%.
2.1.4 Silica fume (sF)
Silica fume txais cov silica fume ntawm Shanghai Aika Silica Fume Material Co., Ltd., nws qhov ceev yog 2.59 / cm3; thaj chaw tshwj xeeb yog 17500m2 / kg, thiab qhov nruab nrab particle loj yog O. 1～0.39m, 28d kev ua index yog 108%, dej thov piv yog 120%.
2.1.5 Redispersible latex hmoov (JF)
Cov roj hmab hmoov siv Max redispersible latex hmoov 6070N (hom kev sib txuas) los ntawm Gomez Chemical China Co., Ltd.
2.1.6 Cellulose Ether (CE)
CMC txais txheej txheej CMC los ntawm Zibo Zou Yongning Chemical Co., Ltd., thiab HPMC txais ob hom hydroxypropyl methylcellulose los ntawm Gomez Chemical Tuam Tshoj Co., Ltd.
2.1.7 Lwm cov khoom xyaw
Hnyav calcium carbonate, ntoo fiber ntau, dej tiv thaiv, calcium formate, thiab lwm yam.
2.1,8 quartz xuab zeb
Lub tshuab ua quartz xuab zeb txais plaub yam zoo: 10-20 mesh, 20-40 H, 40.70 mesh thiab 70.140 H, qhov ceev yog 2650 kg / rn3, thiab pawg combustion yog 1620 kg / m3.
2.1.9 Polycarboxylate superplasticizer hmoov (PC)
Cov hmoov polycarboxylate ntawm Suzhou Xingbang Chemical Building Materials Co., Ltd.) yog 1J1030, thiab cov dej txo qis yog 30%.
2.1.10 Xuab zeb (S)
Cov xuab zeb nruab nrab ntawm Dawen River hauv Tai'an yog siv.
2.1.11 Coarse aggregate (G)
Siv Jinan Ganggou los tsim 5 "~ 25 crushed pob zeb.
2.2 Test method
2.2.1 Test method for slurry fluidity
Cov khoom siv kuaj: NJ. 160 hom cement slurry tov khoom, tsim los ntawm Wuxi Jianyi Instrument Machinery Co., Ltd.
Cov txheej txheem xeem thiab cov txiaj ntsig tau suav nrog raws li txoj hauv kev sim rau cov dej ntws ntawm cov cement paste hauv Cov Ntawv Ntxiv A ntawm "GB 50119.2003 Cov Lus Qhia Tshwj Xeeb rau Kev Siv Cov Khoom Siv Pob Zeb" lossis ((GB / T8077-2000 Test Method for Homogeneousness of Concrete Admixtures) .
2.2.2 Test method for fluidity of high fluidity mortar
Cov khoom siv kuaj: JJ. Hom 5 cement mortar tov khoom, tsim los ntawm Wuxi Jianyi Instrument Machinery Co., Ltd.;
TYE-2000B mortar compression kuaj tshuab, tsim los ntawm Wuxi Jianyi Instrument Machinery Co., Ltd.;
TYE-300B mortar dabtsi yog khoov kuaj tshuab, tsim los ntawm Wuxi Jianyi Instrument Machinery Co., Ltd.
Mortar fluidity detection method yog raws li "JC. T 986-2005 Cement-raws li cov ntaub ntawv grouting" thiab "GB 50119-2003 Technical Specifications for the Application of Concrete Admixtures" Appendix A, qhov loj ntawm lub khob hliav qab siv, qhov siab yog 60mm, lub puab kab uas hla ntawm qhov chaw nres nkoj sab saud yog 70mm , sab hauv txoj kab uas hla ntawm qhov chaw nres nkoj qis yog 100mm, thiab sab nraud ntawm qhov chaw nres nkoj qis yog 120mm, thiab tag nrho qhov hnyav ntawm cov mortar yuav tsum tsis pub tsawg dua 2000g txhua zaus.
Qhov kev ntsuam xyuas ntawm ob lub fluidities yuav tsum coj tus nqi nruab nrab ntawm ob txoj kab ntsug raws li qhov kawg tshwm sim.
2.2.3 Test method for tensile bond strength of bonded mortar
Cov cuab yeej xeem tseem ceeb: WDL. Hom 5 hluav taws xob universal kuaj tshuab, tsim los ntawm Tianjin Gangyuan Instrument Factory.
Txoj kev sim rau tensile daim ntawv cog lus yuav tsum tau muab coj los siv nrog rau Tshooj 10 ntawm (JGJ/T70.2009 Standard for Test Methods for Basic Properties of Building Mortars.
Tshooj 3. Cov txiaj ntsig ntawm cellulose ether ntawm cov tshuaj dawb huv thiab tshuaj khib ntawm binary cementitious cov khoom ntawm ntau cov ntxhia sib xyaw
Liquidity Impact
Tshooj lus no tshawb txog ntau lub cellulose ethers thiab ntxhia sib xyaw los ntawm kev sim ntau ntau ntawm ntau qib ntshiab cement-based slurries thiab mortars thiab binary cementitious system slurries thiab mortars nrog ntau cov ntxhia ntxhia thiab lawv cov fluidity thiab poob lub sijhawm. Txoj cai cuam tshuam ntawm kev siv cov khoom siv ntawm cov dej ntws ntawm cov slurry huv thiab mortar, thiab cov kev cuam tshuam ntawm ntau yam yog suav nrog thiab txheeb xyuas.
3.1 Cov ntsiab lus ntawm kev sim raws tu qauv
Raws li kev cuam tshuam ntawm cellulose ether ntawm kev ua haujlwm ntawm cov cement ntshiab thiab ntau yam khoom siv cementitious, peb feem ntau kawm hauv ob hom:
1. kuab. Nws muaj qhov zoo ntawm kev xav, kev ua haujlwm yooj yim thiab raug siab, thiab yog qhov tsim nyog tshaj plaws rau kev tshawb nrhiav kev hloov pauv ntawm cov khoom siv xws li cellulose ether rau cov khoom siv gelling, thiab qhov sib txawv yog pom tseeb.
2. High fluidity mortar. Kev ua tiav lub xeev siab ntws kuj yog rau kev yooj yim ntawm kev ntsuas thiab kev soj ntsuam. Ntawm no, qhov kev hloov pauv ntawm cov ntaub ntawv ntws hauv xeev feem ntau yog tswj los ntawm kev ua haujlwm siab superplasticizers. Yuav kom txo tau qhov kev xeem yuam kev, peb siv polycarboxylate dej reducer nrog dav adaptability rau cement, uas yog rhiab heev rau qhov kub thiab txias, thiab qhov ntsuas kub yuav tsum tau tswj nruj me ntsis.
3.2 Kev ntsuas ntsuas ntawm cellulose ether ntawm fluidity ntawm ntshiab cement paste
3.2.1 Cov tswv yim sim rau cov nyhuv ntawm cellulose ether ntawm fluidity ntawm ntshiab cement paste
Lub hom phiaj ntawm kev cuam tshuam ntawm cellulose ether ntawm lub fluidity ntawm cov ntshiab slurry, cov ntshiab cement slurry ntawm ib qho khoom siv cementitious system yog thawj zaug siv los soj ntsuam cov cawv. Lub ntsiab siv ntsuas ntawm no txais yuav qhov kev paub ntau tshaj plaws hauv kev tshawb nrhiav fluidity.
Cov hauv qab no yog suav tias yog cuam tshuam rau kev txav mus los:
1. Hom cellulose ethers
2. Cellulose ether cov ntsiab lus
3. Lub sijhawm so slurry
Ntawm no, peb kho cov ntsiab lus PC ntawm cov hmoov ntawm 0.2%. Peb pawg thiab plaub pawg kev xeem tau siv rau peb hom cellulose ethers (carboxymethylcellulose sodium CMC, hydroxypropyl methylcellulose HPMC). Rau sodium carboxymethyl cellulose CMC, qhov ntau npaum li cas ntawm 0%, O. 10%, O. 2%, namely Og, 0.39, 0.69 (tus nqi ntawm cov cement hauv txhua qhov kev sim yog 3009). , rau hydroxypropyl methyl cellulose ether, qhov ntau npaum yog 0%, O. 05%, O. 10%, O. 15%, uas yog 09, 0.159, 0.39, 0.459.
3.2.2 Cov txiaj ntsig thiab kev tshuaj xyuas ntawm cov txiaj ntsig ntawm cellulose ether ntawm cov kua dej ntshiab ntawm cov cement paste
(1) Cov txiaj ntsig kev ntsuas dej ntawm cov cement ntshiab tov nrog CMC
Kev ntsuam xyuas cov txiaj ntsig kev xeem:
1. Mobility taw qhia:
Muab piv rau peb pawg nrog tib lub sijhawm sawv ntsug, nyob rau hauv cov nqe lus ntawm qhov pib fluidity, nrog rau qhov sib ntxiv ntawm CMC, qhov pib fluidity poob me ntsis; ib nrab-teev fluidity poob qis heev nrog rau qhov ntau npaum li cas, feem ntau vim yog ib nrab-teev fluidity ntawm pawg dawb paug. Nws yog 20 hli loj tshaj qhov pib (qhov no tej zaum yuav tshwm sim los ntawm retardation ntawm PC hmoov): -IJ, lub fluidity txo me ntsis ntawm 0.1% ntau npaum, thiab nce ntxiv ntawm 0.2% ntau npaum.
Muab piv rau peb pawg nrog tib koob tshuaj, qhov fluidity ntawm pawg dawb paug yog qhov loj tshaj plaws nyob rau hauv ib nrab ib teev, thiab txo qis hauv ib teev (qhov no tej zaum yuav yog vim qhov tseeb tias tom qab ib teev, cov cement particles tshwm ntau hydration thiab adhesion, cov txheej txheem inter-particle tau pib tsim, thiab cov slurry tshwm ntau dua); qhov fluidity ntawm C1 thiab C2 pawg tau txo qis me ntsis hauv ib nrab ib teev, qhia tias kev nqus dej ntawm CMC muaj qee yam cuam tshuam rau lub xeev; thaum nyob rau hauv cov ntsiab lus ntawm C2, muaj ib tug loj nce nyob rau hauv ib teev, qhia tau hais tias cov ntsiab lus ntawm Cov nyhuv ntawm retardation nyhuv ntawm CMC yog dominant.
2. Phenomenon piav piav qhia:
Nws tuaj yeem pom tau tias nrog kev nce ntawm cov ntsiab lus ntawm CMC, qhov tshwm sim ntawm khawb pib tshwm sim, qhia tias CMC muaj qee yam cuam tshuam rau kev nce cov viscosity ntawm cov cement paste, thiab cov huab cua-entraining nyhuv ntawm CMC ua rau tiam ntawm cua npuas.
(2) Cov txiaj ntsig kev ntsuas dej ntawm cov cement ntshiab tov nrog HPMC (viscosity 100,000)
Kev ntsuam xyuas cov txiaj ntsig kev xeem:
1. Mobility taw qhia:
Los ntawm cov kab kos ntawm cov nyhuv ntawm lub sij hawm sawv ntawm fluidity, nws yuav pom tau hais tias lub fluidity nyob rau hauv ib nrab ib teev yog loj heev piv nrog rau thawj zaug thiab ib teev, thiab nrog rau qhov nce ntawm cov ntsiab lus ntawm HPMC, tus qauv yog tsis muaj zog. Zuag qhia tag nrho, qhov poob ntawm fluidity tsis loj, qhia tau hais tias HPMC muaj cov dej ruaj khov rau cov slurry, thiab muaj qee yam cuam tshuam.
Nws tuaj yeem pom los ntawm kev soj ntsuam tias qhov fluidity tsis tshua muaj siab rau cov ntsiab lus ntawm HPMC. Hauv kev sim ntau yam, qhov loj dua cov ntsiab lus ntawm HPMC, qhov me dua qhov fluidity. Nws yog qhov yooj yim los sau cov kua nplaum lub khob los ntawm nws tus kheej nyob rau hauv tib tus nqi ntawm cov dej. Nws tuaj yeem pom tau tias tom qab ntxiv HPMC, qhov dej ntws los ntawm lub sijhawm tsis loj rau cov slurry ntshiab.
2. Phenomenon piav piav qhia:
Cov pab pawg neeg dawb paug muaj qhov tshwm sim los ntshav, thiab nws tuaj yeem pom los ntawm kev hloov pauv ntawm cov dej ntws tawm nrog cov koob tshuaj uas HPMC muaj zog tuav dej ntau dua thiab cov nyhuv thickening dua li CMC, thiab ua lub luag haujlwm tseem ceeb hauv kev tshem tawm qhov tshwm sim los ntshav. Cov npuas huab cua loj yuav tsum tsis txhob nkag siab tias yog qhov cuam tshuam ntawm huab cua nkag. Qhov tseeb, tom qab cov viscosity nce, cov huab cua sib xyaw ua ke hauv cov txheej txheem nplawm tsis tuaj yeem raug ntaus ua npuas me me vim tias cov slurry yog viscous heev.
(3) Cov txiaj ntsig kev ntsuas dej ntawm cov cement ntshiab tov nrog HPMC (viscosity ntawm 150,000)
Kev ntsuam xyuas cov txiaj ntsig kev xeem:
1. Mobility taw qhia:
Los ntawm kab kab ntawm kev cuam tshuam ntawm cov ntsiab lus ntawm HPMC (150,000) ntawm fluidity, kev cuam tshuam ntawm kev hloov ntawm cov ntsiab lus ntawm fluidity yog pom tseeb dua li ntawm 100,000 HPMC, qhia tias qhov nce ntawm viscosity ntawm HPMC yuav txo tau. lub fluidity.
Raws li kev soj ntsuam muaj kev txhawj xeeb, raws li tag nrho cov kev hloov pauv ntawm fluidity nrog lub sij hawm, ib nrab-teev retarding nyhuv ntawm HPMC (150,000) yog pom tseeb, thaum cov nyhuv ntawm -4, yog phem dua li ntawm HPMC (100,000) .
2. Phenomenon piav piav qhia:
Muaj los ntshav hauv pab pawg neeg dawb huv. Yog vim li cas rau khawb lub phaj yog vim cov dej-cement piv ntawm cov slurry hauv qab ua me me tom qab los ntshav, thiab cov slurry yog ntom thiab nyuaj rau khawb los ntawm iav phaj. Qhov sib ntxiv ntawm HPMC ua lub luag haujlwm tseem ceeb hauv kev tshem tawm qhov tshwm sim los ntshav. Nrog rau qhov nce ntawm cov ntsiab lus, ib qho me me ntawm cov npuas me me tau tshwm sim thawj zaug thiab tom qab ntawd cov npuas loj tshwm sim. Cov npuas me me feem ntau tshwm sim los ntawm ib qho laj thawj. Ib yam li ntawd, cov npuas loj yuav tsum tsis txhob nkag siab tias yog qhov cuam tshuam ntawm huab cua nkag. Qhov tseeb, tom qab cov viscosity nce, cov huab cua sib xyaw hauv cov txheej txheem nplawm yog qhov khov heev thiab tsis tuaj yeem dhau los ntawm slurry.
3.3 Kev ntsuam xyuas kev cuam tshuam ntawm cellulose ether ntawm cov kua dej ntshiab slurry ntawm ntau cov khoom siv cementitious
Tshooj lus no tsuas yog tshawb txog cov txiaj ntsig ntawm kev siv cov khoom siv sib xyaw ua ke thiab peb lub cellulose ethers (carboxymethyl cellulose sodium CMC, hydroxypropyl methyl cellulose HPMC) ntawm qhov fluidity ntawm cov tawv nqaij.
Ib yam li ntawd, peb pawg thiab plaub pawg kev xeem tau siv rau peb hom cellulose ethers (carboxymethylcellulose sodium CMC, hydroxypropyl methylcellulose HPMC). Rau sodium carboxymethyl cellulose CMC, qhov ntau npaum ntawm 0%, 0.10%, thiab 0.2%, uas yog 0g, 0.3g, thiab 0.6g (cov cement ntau npaum li cas rau txhua qhov kev sim yog 300g). Rau hydroxypropyl methylcellulose ether, qhov ntau npaum yog 0%, 0.05%, 0.10%, 0.15%, uas yog 0g, 0.15g, 0.3g, 0.45g. Cov ntsiab lus PC ntawm cov hmoov yog tswj ntawm 0.2%.
Cov hmoov tshauv thiab slag hmoov nyob rau hauv cov ntxhia admixture yog hloov los ntawm tib tus nqi ntawm kev sib xyaw ua ke, thiab cov qib sib xyaw yog 10%, 20% thiab 30%, uas yog, qhov hloov pauv yog 30g, 60g thiab 90g. Txawm li cas los xij, txiav txim siab qhov cuam tshuam ntawm kev ua haujlwm siab dua, shrinkage, thiab lub xeev, cov ntsiab lus silica fume yog tswj rau 3%, 6%, thiab 9%, uas yog, 9g, 18g, thiab 27g.
3.3.1 Cov tswv yim sim rau cov nyhuv ntawm cellulose ether ntawm cov kua dej ntawm cov ntshiab slurry ntawm binary cementitious khoom
(1) Lub tswv yim sim rau qhov fluidity ntawm binary cementitious cov ntaub ntawv sib xyaw nrog CMC thiab ntau yam ntxhia admixtures.
(2) Kev sim npaj rau qhov fluidity ntawm binary cementitious cov ntaub ntawv sib xyaw nrog HPMC (viscosity 100,000) thiab ntau yam ntxhia admixtures.
(3) Lub tswv yim sim rau lub fluidity ntawm binary cementitious cov ntaub ntawv tov nrog HPMC (viscosity ntawm 150,000) thiab ntau yam ntxhia admixtures.
3.3.2 Kev ntsuam xyuas thiab kev soj ntsuam ntawm cov nyhuv ntawm cellulose ether ntawm fluidity ntawm ntau cov khoom cementitious
(1) Qhov kev ntsuam xyuas thawj zaug ntawm cov khoom siv cementitious binary ntshiab slurry tov nrog CMC thiab ntau yam ntxhia admixtures.
Nws tuaj yeem pom los ntawm qhov no tias qhov sib ntxiv ntawm yoov tshauv tuaj yeem ua rau muaj txiaj ntsig zoo rau thawj zaug fluidity ntawm slurry, thiab nws zoo li nthuav dav nrog qhov nce ntawm ya tshauv cov ntsiab lus. Nyob rau tib lub sijhawm, thaum cov ntsiab lus ntawm CMC nce, qhov fluidity txo me ntsis, thiab qhov siab tshaj plaws txo yog 20mm.
Nws tuaj yeem pom tau tias qhov pib fluidity ntawm cov ntshiab slurry tuaj yeem nce ntxiv ntawm qhov tsawg ntawm cov hmoov ntxhia hmoov, thiab kev txhim kho ntawm fluidity tsis pom tseeb thaum qhov ntau npaum li 20%. Nyob rau tib lub sijhawm, tus nqi ntawm CMC hauv O. Ntawm 1%, fluidity yog qhov siab tshaj plaws.
Nws tuaj yeem pom los ntawm qhov no tias cov ntsiab lus ntawm silica fume feem ntau muaj qhov cuam tshuam tsis zoo rau qhov pib fluidity ntawm slurry. Nyob rau tib lub sijhawm, CMC kuj txo qis qhov fluidity me ntsis.
Ib nrab-teev fluidity xeem tau ntawm cov ntshiab binary cementitious cov ntaub ntawv tov nrog CMC thiab ntau yam ntxhia admixtures.
Nws tuaj yeem pom tau tias qhov kev txhim kho ntawm cov fluidity ntawm ya tshauv rau ib nrab ib teev yog qhov zoo ntawm kev siv tsawg, tab sis nws kuj yuav yog vim nws nyob ze rau qhov kev txwv ntawm cov ntshiab slurry. Tib lub sijhawm, CMC tseem muaj qhov txo qis hauv fluidity.
Tsis tas li ntawd, muab piv rau qhov pib thiab ib nrab-teev fluidity, nws tuaj yeem pom tias cov hmoov tshauv yoov tshaj cum muaj txiaj ntsig zoo los tswj qhov poob ntawm fluidity lub sijhawm.
Nws tuaj yeem pom los ntawm qhov no tias tag nrho cov hmoov ntxhia hmoov tsis muaj qhov pom tseeb tsis zoo ntawm cov kua dej ntshiab slurry rau ib nrab ib teev, thiab qhov tsis tu ncua tsis muaj zog. Nyob rau tib lub sijhawm, cov txiaj ntsig ntawm CMC cov ntsiab lus ntawm fluidity hauv ib nrab ib teev tsis pom tseeb, tab sis kev txhim kho ntawm 20% ntxhia hmoov hloov pawg yog qhov pom tseeb.
Nws tuaj yeem pom tias qhov cuam tshuam tsis zoo ntawm cov dej ntshiab ntawm cov slurry ntshiab nrog cov nyiaj ntawm silica fume rau ib nrab ib teev yog pom tseeb dua li qhov pib, tshwj xeeb tshaj yog cov nyhuv hauv thaj tsam ntawm 6% mus rau 9% yog pom tseeb dua. Nyob rau tib lub sijhawm, qhov txo qis ntawm CMC cov ntsiab lus ntawm qhov fluidity yog li 30 hli, uas yog ntau dua li qhov txo qis ntawm CMC cov ntsiab lus mus rau qhov pib.
(2) Qhov kev ntsuam xyuas thawj zaug ntawm cov khoom siv cementitious binary ntshiab slurry tov nrog HPMC (viscosity 100,000) thiab ntau yam ntxhia admixtures
Los ntawm qhov no, nws tuaj yeem pom tau tias cov nyhuv ntawm ya tshauv ntawm fluidity yog qhov pom tseeb, tab sis nws pom nyob rau hauv qhov kev ntsuam xyuas tias ya tshauv tsis muaj qhov pom tseeb txhim kho los ntshav. Tsis tas li ntawd, qhov txo cov nyhuv ntawm HPMC ntawm cov kua dej yog pom tseeb heev (tshwj xeeb tshaj yog nyob rau hauv thaj tsam ntawm 0.1% mus rau 0.15% ntawm kev siv ntau, qhov siab tshaj plaws txo tuaj yeem ncav cuag ntau dua 50mm).
Nws tuaj yeem pom tau tias cov hmoov ntxhia muaj qhov cuam tshuam me ntsis ntawm cov kua dej, thiab tsis ua kom cov ntshav zoo. Tsis tas li ntawd, qhov txo cov nyhuv ntawm HPMC ntawm fluidity nce mus txog 60mm nyob rau hauv thaj tsam ntawm 0.1%～0.15% ntawm qhov ntau npaum li cas.
Los ntawm qhov no, nws tuaj yeem pom tias qhov txo qis ntawm fluidity ntawm silica fume yog pom tseeb dua nyob rau hauv qhov ntau npaum li cas, thiab ntxiv rau, silica fume muaj kev txhim kho pom tseeb ntawm cov ntshav hauv qhov kev sim. Nyob rau tib lub sijhawm, HPMC muaj cov txiaj ntsig pom tseeb ntawm kev txo cov kua dej (tshwj xeeb tshaj yog nyob rau hauv ntau qhov ntau npaum li cas (0.1% txog 0.15%).Raws li qhov cuam tshuam ntawm fluidity, silica fume thiab HPMC ua lub luag haujlwm tseem ceeb, thiab Lwm yam Cov tshuaj nplaum ua raws li kev pabcuam me me.
Nws tuaj yeem pom tau tias, feem ntau, cov txiaj ntsig ntawm peb qhov sib xyaw ua ke ntawm qhov fluidity zoo ib yam li tus nqi pib. Thaum cov silica fume nyob rau ntawm cov ntsiab lus siab ntawm 9% thiab cov ntsiab lus HPMC yog O. Nyob rau hauv rooj plaub ntawm 15%, qhov tshwm sim uas cov ntaub ntawv tsis tuaj yeem sau tau vim lub xeev tsis zoo ntawm cov slurry yog qhov nyuaj rau sau lub khob hliav qab pwm. , qhia tau hais tias viscosity ntawm silica fume thiab HPMC tau nce ntau ntawm ntau npaum li cas. Piv nrog CMC, qhov viscosity nce nyhuv ntawm HPMC yog qhov pom tseeb heev.
(3) Qhov kev ntsuam xyuas thawj zaug ntawm cov khoom siv cementitious binary ntshiab slurry tov nrog HPMC (viscosity 100,000) thiab ntau yam ntxhia admixtures
Los ntawm qhov no, nws tuaj yeem pom tias HPMC (150,000) thiab HPMC (100,000) muaj qhov cuam tshuam zoo sib xws ntawm cov slurry, tab sis HPMC nrog cov viscosity siab muaj qhov txo qis me ntsis hauv fluidity, tab sis nws tsis pom tseeb, uas yuav tsum muaj feem cuam tshuam nrog kev sib cais. ntawm HPMC. Qhov ceev muaj ib qho kev sib raug zoo. Ntawm cov admixtures, cov nyhuv ntawm ya tshauv cov ntsiab lus ntawm fluidity ntawm slurry yog ib qho yooj yim linear thiab zoo, thiab 30% ntawm cov ntsiab lus yuav ua rau kom lub fluidity los ntawm 20,-,30mm; Cov nyhuv tsis pom tseeb, thiab nws txoj kev txhim kho ntawm cov ntshav yog txwv; Txawm tias nyob rau theem me me ntawm tsawg dua 10%, silica fume muaj qhov pom tseeb heev ntawm kev txo cov ntshav, thiab nws qhov chaw tshwj xeeb yog ze li ob npaug ntau dua li cov cement. kev txiav txim ntawm qhov loj, cov nyhuv ntawm nws cov adsorption ntawm cov dej ntawm kev txav mus los yog qhov tseem ceeb heev.
Nyob rau hauv ib lo lus, nyob rau hauv qhov sib txawv ntawm qhov ntau npaum li cas, yam cuam tshuam rau lub fluidity ntawm slurry, qhov ntau npaum ntawm silica fume thiab HPMC yog qhov tseem ceeb tshaj plaws, txawm tias nws yog kev tswj ntshav los yog kev tswj ntawm lub xeev ntws, nws yog. pom tseeb dua, lwm yam Cov nyhuv ntawm admixtures yog theem nrab thiab plays lub luag haujlwm hloov kho.
Qhov thib peb qhia txog kev cuam tshuam ntawm HPMC (150,000) thiab cov khoom sib xyaw ntawm cov kua dej ntshiab hauv ib nrab teev, uas feem ntau zoo ib yam li txoj cai ntawm tus nqi pib. Nws tuaj yeem pom tias qhov nce ntawm ya tshauv ntawm cov kua dej ntshiab ntawm cov slurry rau ib nrab ib teev yog qhov pom tseeb me ntsis tshaj qhov nce ntawm qhov pib fluidity, lub zog ntawm cov hmoov slag tseem tsis pom tseeb, thiab cov ntsiab lus ntawm silica fume ntawm fluidity. tseem pom tseeb heev. Tsis tas li ntawd, hais txog cov ntsiab lus ntawm HPMC, muaj ntau qhov tshwm sim uas tsis tuaj yeem nchuav tawm ntawm cov ntsiab lus siab, qhia tias nws cov O. 15% ntau npaum li cas muaj txiaj ntsig zoo rau kev nce viscosity thiab txo cov fluidity, thiab nyob rau hauv cov nqe lus ntawm fluidity rau ib nrab. ib teev, piv nrog tus nqi pib, cov slag pab pawg O. Qhov fluidity ntawm 05% HPMC txo qis dua.
Nyob rau hauv cov nqe lus ntawm qhov poob ntawm fluidity nyob rau lub sij hawm, kev koom ua ke ntawm silica fume muaj qhov cuam tshuam loj heev rau nws, feem ntau vim tias silica fume muaj qhov loj, kev ua haujlwm siab, cov tshuaj tiv thaiv sai, thiab muaj peev xwm nqus dej noo, ua rau muaj kev cuam tshuam loj heev. fluidity rau lub sijhawm sawv. Rau.
3.4 Kev sim ntawm cov nyhuv ntawm cellulose ether ntawm fluidity ntawm cov cement-based high-fluidity mortar
3.4.1 Cov tswv yim sim rau cov nyhuv ntawm cellulose ether ntawm cov kua dej ntawm cov cement-based high-fluidity mortar
Siv cov tshuaj khib nyiab siab kom pom nws cov txiaj ntsig ntawm kev ua haujlwm. Lub ntsiab lus qhia ntawm no yog thawj zaug thiab ib nrab-teev mortar fluidity test.
Cov hauv qab no yog suav tias yog cuam tshuam rau kev txav mus los:
1 hom cellulose ethers,
2 Kev noj cov cellulose ether,
3 Lub sij hawm sawv ntsug
3.4.2 Cov txiaj ntsig thiab kev tshuaj xyuas ntawm cov txiaj ntsig ntawm cellulose ether ntawm cov kua dej ntawm cov cement-based high-fluidity mortar
(1) Fluidity xeem tau ntawm cov cement mortar tov nrog CMC
Summary and analysis of test results:
1. Mobility taw qhia:
Muab piv rau peb pawg nrog tib lub sijhawm sawv ntsug, nyob rau hauv cov nqe lus ntawm qhov pib fluidity, nrog rau qhov sib ntxiv ntawm CMC, qhov pib fluidity poob me ntsis, thiab thaum cov ntsiab lus mus txog O. Ntawm 15%, muaj qhov pom tseeb txo qis; qhov txo qis ntawm qhov fluidity nrog qhov nce ntawm cov ntsiab lus hauv ib nrab teev yog zoo ib yam li tus nqi pib.
2. Cov tsos mob:
Kev hais lus theoretical, piv nrog cov slurry huv si, kev koom ua ke ntawm cov khoom sib xyaw hauv mortar ua rau nws yooj yim dua rau huab cua npuas kom nkag mus rau hauv slurry, thiab cov nyhuv thaiv ntawm aggregates ntawm los ntshav voids kuj yuav ua rau nws yooj yim rau huab cua npuas lossis los ntshav kom khaws cia. Nyob rau hauv lub slurry, yog li ntawd, cov huab cua npuas cov ntsiab lus thiab qhov loj ntawm lub mortar yuav tsum ntau thiab loj dua li cov slurry zoo. Ntawm qhov tod tes, nws tuaj yeem pom tau tias nrog kev nce ntawm cov ntsiab lus ntawm CMC, qhov fluidity txo qis, qhia tias CMC muaj qee yam thickening nyhuv ntawm mortar, thiab ib nrab-teev fluidity test qhia tau hais tias cov npuas dej ntws tawm ntawm qhov chaw. nce me ntsis. , uas kuj yog ib qho kev tshwm sim ntawm qhov nce sib xws, thiab thaum qhov sib xws nce mus txog ib theem, cov npuas yuav nyuaj dhau, thiab tsis muaj npuas pom tseeb yuav pom ntawm qhov chaw.
(2) Cov txiaj ntsig kev ntsuas dej ntawm cov cement mortar tov nrog HPMC (100,000)
Kev ntsuam xyuas cov txiaj ntsig kev xeem:
1. Mobility taw qhia:
Nws tuaj yeem pom los ntawm daim duab uas nrog qhov nce ntawm cov ntsiab lus ntawm HPMC, qhov fluidity tau txo qis heev. Piv nrog CMC, HPMC muaj cov nyhuv thickening. Cov nyhuv thiab dej tuav tau zoo dua. Los ntawm 0.05% mus rau 0.1%, qhov ntau ntawm fluidity hloov yog pom tseeb dua, thiab los ntawm O. Tom qab 1%, tsis yog thawj zaug lossis ib nrab teev hloov pauv hauv fluidity loj dhau.
2. Phenomenon piav piav qhia:
Nws tuaj yeem pom los ntawm lub rooj thiab daim duab tias tsis muaj cov npuas hauv ob pawg ntawm Mh2 thiab Mh3, qhia tau hais tias cov viscosity ntawm ob pawg twb kuj loj heev, tiv thaiv cov npuas npuas hauv slurry.
(3) Cov txiaj ntsig kev ntsuas dej ntawm cov cement mortar tov nrog HPMC (150,000)
Kev ntsuam xyuas cov txiaj ntsig kev xeem:
1. Mobility taw qhia:
Muab piv rau ob peb pawg nrog tib lub sijhawm sawv ntsug, qhov kev sib txawv yog tias ob qho tib si thawj zaug thiab ib nrab-teev fluidity txo nrog qhov nce ntawm cov ntsiab lus ntawm HPMC, thiab qhov txo qis yog pom tseeb dua li ntawm HPMC nrog viscosity ntawm 100,000, qhia tias qhov nce ntawm viscosity ntawm HPMC ua rau nws nce. Cov nyhuv thickening muaj zog, tab sis nyob rau hauv O. Cov nyhuv ntawm qhov ntau npaum li cas hauv qab no 05% yog tsis pom tseeb, lub fluidity muaj ib tug kuj loj kev hloov nyob rau hauv qhov ntau ntawm 0.05% mus rau 0.1%, thiab cov qauv yog dua nyob rau hauv ntau ntawm 0.1%. mus txog 0.15%. Ua qeeb qeeb, lossis tseem nres hloov. Muab piv rau ib nrab-teev fluidity poob qhov tseem ceeb (pib fluidity thiab ib nrab-teev fluidity) ntawm HPMC nrog ob viscosities, nws tuaj yeem pom tias HPMC nrog cov viscosity siab tuaj yeem txo tus nqi poob, qhia tias nws cov dej tuav thiab teeb tsa cov nyhuv retardation yog. zoo tshaj qhov uas tsis muaj viscosity.
2. Phenomenon piav piav qhia:
Hais txog kev tswj cov ntshav, ob lub HPMCs muaj qhov sib txawv me ntsis, ob qho tib si tuaj yeem khaws cov dej thiab ua kom tuab, tshem tawm cov kev tsis zoo los ntawm kev los ntshav, thiab tib lub sij hawm cia cov npuas dej ntws zoo.
3.5 Kev sim ntawm cov nyhuv ntawm cellulose ether ntawm fluidity ntawm high fluidity mortar ntawm ntau yam cementitious cov ntaub ntawv systems
3.5.1 Cov tswv yim sim rau cov nyhuv ntawm cellulose ethers ntawm fluidity ntawm high-fluidity mortars ntawm ntau yam khoom siv cementitious
High fluidity mortar tseem siv los saib xyuas nws cov kev cuam tshuam ntawm fluidity. Cov cim qhia tseem ceeb yog qhov pib thiab ib nrab-teev mortar fluidity nrhiav kom pom.
(1) Kev sim cov txheej txheem ntawm mortar fluidity nrog binary cementitious cov ntaub ntawv sib xyaw nrog CMC thiab ntau yam ntxhia admixtures
(2) Kev sim cov txheej txheem ntawm mortar fluidity nrog HPMC (viscosity 100,000) thiab binary cementitious cov ntaub ntawv ntawm ntau yam ntxhia admixtures
(3) Kev sim cov txheej txheem ntawm mortar fluidity nrog HPMC (viscosity 150,000) thiab binary cementitious cov ntaub ntawv ntawm ntau yam ntxhia admixtures
3.5.2 Cov txiaj ntsig ntawm cellulose ether ntawm cov kua dej ntawm cov kua qaub siab hauv cov khoom siv cementitious binary ntawm ntau cov ntxhia hauv cov khoom siv tshuaj ntsuam xyuas thiab tshuaj xyuas
(1) Cov txiaj ntsig ntawm qhov pib fluidity xeem ntawm binary cementitious mortar tov nrog CMC thiab ntau yam admixtures
Los ntawm cov txiaj ntsig ntawm kev ntsuas thawj zaug, nws tuaj yeem xaus lus tias qhov sib ntxiv ntawm cov hmoov tshauv ya tuaj yeem txhim kho me ntsis fluidity ntawm mortar; thaum cov ntsiab lus ntawm cov ntxhia hmoov yog 10%, qhov fluidity ntawm mortar tuaj yeem txhim kho me ntsis; thiab silica fume muaj kev cuam tshuam ntau dua ntawm fluidity, tshwj xeeb tshaj yog nyob rau hauv thaj tsam ntawm 6% ~ 9% cov ntsiab lus sib txawv, ua rau txo qis ntawm fluidity ntawm 90mm.
Nyob rau hauv ob pawg ntawm ya tshauv thiab ntxhia hmoov, CMC txo qhov fluidity ntawm mortar rau ib qho twg, thaum nyob rau hauv silica fume pawg, O. Qhov nce ntawm CMC cov ntsiab lus saum toj no 1% tsis cuam tshuam rau fluidity ntawm mortar.
Ib nrab-teev fluidity xeem tau los ntawm binary cementitious mortar tov nrog CMC thiab ntau yam admixtures
Los ntawm qhov kev ntsuam xyuas ntawm cov fluidity nyob rau hauv ib nrab ib teev, nws tuaj yeem txiav txim siab tias cov nyhuv ntawm cov ntsiab lus ntawm admixture thiab CMC zoo ib yam li thawj zaug, tab sis cov ntsiab lus ntawm CMC nyob rau hauv cov ntxhia hmoov hmoov hloov los ntawm O. 1% mus rau O. Qhov hloov 2% yog loj dua, ntawm 30mm.
Nyob rau hauv cov nqe lus ntawm qhov poob ntawm fluidity nyob rau lub sij hawm, ya tshauv muaj cov nyhuv ntawm kev txo qhov poob, thaum cov ntxhia hmoov thiab silica fume yuav ua rau kom poob nqi nyob rau hauv siab npaum li cas. 9% ntau npaum li cas ntawm silica fume kuj ua rau cov pwm kuaj tsis tau sau los ntawm nws tus kheej. , fluidity tsis tuaj yeem ntsuas qhov tseeb.
(2) Qhov kev ntsuam xyuas thawj zaug ntawm binary cementitious mortar tov nrog HPMC (viscosity 100,000) thiab ntau yam admixtures
Ib nrab-teev fluidity xeem tau los ntawm binary cementitious mortar tov nrog HPMC (viscosity 100,000) thiab ntau yam admixtures
Nws tseem tuaj yeem txiav txim siab los ntawm kev sim uas qhov sib ntxiv ntawm cov tshauv ya tuaj yeem txhim kho cov kua dej ntawm cov mortar me ntsis; thaum cov ntsiab lus ntawm cov ntxhia hmoov yog 10%, qhov fluidity ntawm mortar tuaj yeem txhim kho me ntsis; Qhov ntau npaum li cas yog qhov rhiab heev, thiab cov pab pawg HPMC nrog ntau npaum li cas ntawm 9% muaj cov pob txha tuag, thiab cov dej ntws tau ploj mus.
Cov ntsiab lus ntawm cellulose ether thiab silica fume kuj yog qhov pom tseeb tshaj plaws cuam tshuam rau cov dej ntawm cov tshuaj khib nyiab. Cov txiaj ntsig ntawm HPMC yog qhov tseeb ntau dua li ntawm CMC. Lwm cov khoom xyaw tuaj yeem txhim kho qhov poob ntawm fluidity nyob rau lub sijhawm.
(3) Qhov kev ntsuam xyuas thawj zaug ntawm binary cementitious mortar tov nrog HPMC (viscosity ntawm 150,000) thiab ntau yam admixtures
Ib nrab-teev fluidity xeem tau los ntawm binary cementitious mortar tov nrog HPMC (viscosity 150,000) thiab ntau yam admixtures
Nws tseem tuaj yeem txiav txim siab los ntawm kev sim uas qhov sib ntxiv ntawm cov tshauv ya tuaj yeem txhim kho cov kua dej ntawm cov mortar me ntsis; Thaum cov ntsiab lus ntawm cov hmoov ntxhia yog 10%, qhov fluidity ntawm mortar tuaj yeem txhim kho me ntsis: silica fume tseem zoo heev los daws qhov tshwm sim los ntshav, thaum Fluidity yog ib qho kev mob tshwm sim loj, tab sis tsis zoo dua li nws cov nyhuv hauv cov slurries huv. .
Ntau qhov chaw tuag tau tshwm sim nyob rau hauv cov ntsiab lus siab ntawm cellulose ether (tshwj xeeb tshaj yog nyob rau hauv lub rooj ntawm ib nrab-teev fluidity), qhia tias HPMC muaj kev cuam tshuam tseem ceeb ntawm kev txo cov kua dej ntawm cov tshuaj khib nyiab, thiab cov hmoov ntxhia thiab cov hmoov tshauv tuaj yeem txhim kho qhov poob. ntawm fluidity nyob rau lub sijhawm.
3.5 Tshooj Summary
1. Kev sib piv qhov kev ntsuas fluidity ntawm ntshiab cement paste tov nrog peb cellulose ethers, nws tuaj yeem pom tias
1. CMC muaj qee yam kev cuam tshuam thiab huab cua nkag mus, tsis muaj dej tuav, thiab qee qhov poob thaum lub sijhawm.
2. Cov dej tuav pov hwm ntawm HPMC yog qhov pom tseeb, thiab nws muaj kev cuam tshuam loj rau lub xeev, thiab cov dej ntws tau txo qis nrog qhov nce ntawm cov ntsiab lus. Nws muaj qee yam huab cua-entraining nyhuv, thiab lub thickening yog pom tseeb. 15% yuav ua rau cov npuas loj hauv cov slurry, uas yuav ua rau muaj kev puas tsuaj rau lub zog. Nrog rau qhov nce ntawm HPMC viscosity, lub sij hawm-dependent poob ntawm slurry fluidity nce me ntsis, tab sis tsis pom tseeb.
2. Kev sib piv cov slurry fluidity xeem ntawm binary gelling system ntawm ntau yam ntxhia admixtures tov nrog peb cellulose ethers, nws yuav pom tau hais tias:
1. Txoj cai cuam tshuam ntawm peb lub cellulose ethers ntawm fluidity ntawm slurry ntawm binary cementitious system ntawm ntau yam ntxhia admixtures muaj cov yam ntxwv zoo ib yam li txoj cai ntawm lub fluidity ntawm cov ntshiab cement slurry. CMC muaj kev cuam tshuam me ntsis ntawm kev tswj cov ntshav, thiab muaj qhov tsis muaj zog ntawm kev txo cov kua dej; Ob hom HPMC tuaj yeem ua kom cov viscosity ntawm slurry thiab txo cov kua dej ntau, thiab ib qho uas muaj viscosity ntau dua muaj qhov pom tseeb dua.
2. Ntawm cov khoom sib xyaw, cov tshauv ya ya muaj qee qhov kev txhim kho ntawm qhov pib thiab ib nrab-teev fluidity ntawm cov slurry ntshiab, thiab cov ntsiab lus ntawm 30% tuaj yeem nce txog 30 hli; cov nyhuv ntawm cov ntxhia hmoov ntawm lub fluidity ntawm cov ntshiab slurry tsis muaj qhov pom tseeb tsis tu ncua; silicon Txawm hais tias cov ntsiab lus ntawm cov hmoov tshauv tsawg, nws qhov tshwj xeeb ultra-fineness, ceev cov tshuaj tiv thaiv, thiab muaj zog adsorption ua rau nws txo qhov fluidity ntawm slurry, tshwj xeeb tshaj yog thaum 0.15% HPMC ntxiv, yuav muaj cov pwm pwm uas tsis tuaj yeem sau. Qhov tshwm sim.
3. Hauv kev tswj cov ntshav, ya tshauv thiab ntxhia hmoov tsis pom tseeb, thiab silica fume tuaj yeem pom tseeb txo cov ntshav.
4. Nyob rau hauv cov nqe lus ntawm ib nrab-teev poob ntawm fluidity, qhov poob nqi ntawm ya tshauv yog me me, thiab poob tus nqi ntawm cov pab pawg neeg incorporating silica fume yog loj.
5. Nyob rau hauv qhov sib txawv ntawm cov ntsiab lus, cov yam ntxwv cuam tshuam rau lub fluidity ntawm slurry, cov ntsiab lus ntawm HPMC thiab silica fume yog cov tseem ceeb, txawm tias nws yog kev tswj cov ntshav los yog kev tswj ntawm lub xeev ntws, nws yog kuj pom tseeb. Kev cuam tshuam ntawm cov ntxhia hmoov thiab cov hmoov ntxhia hmoov yog qhov thib ob, thiab ua lub luag haujlwm pabcuam hloov kho.
3. Kev sib piv qhov kev ntsuas fluidity ntawm cov cement mortar tov nrog peb cellulose ethers, nws tuaj yeem pom tias
1. Tom qab ntxiv peb lub cellulose ethers, qhov tshwm sim los ntshav tau raug tshem tawm zoo, thiab cov kua dej ntawm cov tshuaj khib feem ntau txo qis. Qee qhov thickening, dej tuav nyhuv. CMC muaj qee yam kev cuam tshuam thiab huab cua nkag mus, tsis muaj dej tuav, thiab qee qhov poob thaum lub sijhawm.
2. Tom qab ntxiv CMC, qhov poob ntawm mortar fluidity nyob rau lub sij hawm nce, uas tej zaum yuav yog vim CMC yog ib tug ionic cellulose ether, uas yog ib qho yooj yim rau tsim los nag nrog Ca2+ nyob rau hauv cov cement.
3. Qhov kev sib piv ntawm peb lub cellulose ethers qhia tau hais tias CMC muaj kev cuam tshuam me ntsis ntawm cov fluidity, thiab ob hom HPMC txo cov fluidity ntawm cov mortar ntawm cov ntsiab lus ntawm 1/1000, thiab ib qho nrog cov viscosity siab dua me ntsis. pom tseeb.
4. Peb hom cellulose ethers muaj qee yam huab cua-entraining nyhuv, uas yuav ua rau saum npoo npuas, tab sis thaum cov ntsiab lus ntawm HPMC nce mus txog ntau tshaj 0.1%, vim lub siab viscosity ntawm slurry, cov npuas tseem nyob rau hauv lub slurry thiab tsis tuaj yeem overflow.
5. Cov dej tuav pov hwm ntawm HPMC yog qhov pom tseeb, uas muaj kev cuam tshuam loj rau lub xeev ntawm cov khoom sib tov, thiab cov kua dej poob qis nrog qhov nce ntawm cov ntsiab lus, thiab cov thickening yog pom tseeb.
4. Sib piv cov fluidity test ntawm ntau cov ntxhia admixture binary cementitious cov ntaub ntawv sib xyaw nrog peb cellulose ethers.
Raws li tuaj yeem pom:
1. Txoj cai cuam tshuam ntawm peb lub cellulose ethers ntawm fluidity ntawm ntau cov khoom siv cementitious mortar zoo ib yam li txoj cai cuam tshuam ntawm fluidity ntawm ntshiab slurry. CMC muaj kev cuam tshuam me ntsis ntawm kev tswj cov ntshav, thiab muaj qhov tsis muaj zog ntawm kev txo cov kua dej; ob hom HPMC tuaj yeem ua kom cov viscosity ntawm mortar thiab txo cov kua dej ntau, thiab cov viscosity siab dua muaj qhov pom tseeb dua.
2. Ntawm cov khoom sib xyaw, cov hmoov tshauv ya tau muaj qee qhov kev txhim kho ntawm qhov pib thiab ib nrab-teev fluidity ntawm cov slurry huv si; lub zog ntawm slag hmoov ntawm lub fluidity ntawm cov slurry huv si tsis muaj qhov pom tseeb tsis tu ncua; Txawm hais tias cov ntsiab lus ntawm silica fume yog tsawg, nws qhov tshwj xeeb ultra-fineness, ceev cov tshuaj tiv thaiv thiab muaj zog adsorption ua rau nws muaj qhov txo qis ntawm cov kua dej ntawm cov slurry. Txawm li cas los xij, piv nrog cov txiaj ntsig ntawm kev tshuaj ntsuam xyuas cov tshuaj dawb huv, nws pom tias cov nyhuv ntawm admixtures zoo li tsis muaj zog.
3. Hauv kev tswj cov ntshav, ya tshauv thiab ntxhia hmoov tsis pom tseeb, thiab silica fume tuaj yeem pom tseeb txo cov ntshav.
4. Nyob rau hauv qhov sib txawv ntawm qhov ntau npaum li cas, cov yam ntxwv cuam tshuam rau lub fluidity ntawm lub mortar, qhov ntau npaum ntawm HPMC thiab silica fume yog qhov tseem ceeb, txawm tias nws yog kev tswj ntshav los yog kev tswj ntawm lub xeev ntws, nws yog ntau dua. pom tseeb, cov silica fume 9% Thaum cov ntsiab lus ntawm HPMC yog 0.15%, nws yog ib qho yooj yim ua rau lub filling pwm yuav nyuaj rau sau, thiab cov cawv ntawm lwm yam admixtures yog theem nrab thiab plays lub luag hauj lwm pab hloov kho.
5. Yuav muaj npuas nyob rau saum npoo ntawm mortar nrog lub fluidity ntawm ntau tshaj 250mm, tab sis cov dawb paug pab pawg neeg uas tsis muaj cellulose ether feem ntau tsis muaj npuas los yog tsuas yog ib tug me me npuas npuas, qhia tias cellulose ether muaj ib tug tej yam huab cua-entraining. cuam tshuam thiab ua rau slurry viscous. Tsis tas li ntawd, vim cov viscosity ntau dhau ntawm cov tshuaj khib nrog cov dej tsis zoo, nws yog qhov nyuaj rau cov pa npuas kom ntab los ntawm tus kheej qhov hnyav ntawm cov slurry, tab sis khaws cia rau hauv mortar, thiab nws lub zog ntawm lub zog tsis tuaj yeem ua tau. tsis quav ntsej.
Tshooj 4 Cov teebmeem ntawm Cellulose Ethers ntawm Cov Khoom Siv Hluav Taws Xob ntawm Cov Khoom Siv Hluav Taws Xob
Tshooj yav dhau los tau kawm txog cov txiaj ntsig ntawm kev siv ua ke ntawm cellulose ether thiab ntau cov ntxhia hauv cov khoom sib xyaw ntawm cov kua dej ntawm cov slurry huv thiab cov kua nplaum siab. Tshooj lus no feem ntau txheeb xyuas kev sib koom ua ke ntawm kev siv cellulose ether thiab ntau yam admixtures ntawm lub siab fluidity mortar Thiab kev cuam tshuam ntawm compressive thiab flexural lub zog ntawm kev sib raug zoo mortar, thiab kev sib raug zoo ntawm tensile bonding zog ntawm lub tsev cog khoom mortar thiab cellulose ether thiab ntxhia. admixtures kuj tau sau thiab txheeb xyuas.
Raws li kev tshawb fawb txog kev ua haujlwm ntawm cellulose ether rau cement-raws li cov khoom siv ntawm cov tshuaj pleev xim dawb thiab tshuaj khib hauv Tshooj 3, hauv qhov kev ntsuam xyuas lub zog, cov ntsiab lus ntawm cellulose ether yog 0.1%.
4.1 Compressive thiab flexural zog kuaj ntawm siab fluidity mortar
Cov compressive thiab flexural zog ntawm ntxhia admixtures thiab cellulose ethers nyob rau hauv high-fluidity infusion mortar tau tshawb xyuas.
4.1.1 Kev ntsuam xyuas cuam tshuam ntawm compressive thiab flexural zog ntawm cov cement-raws li siab fluidity mortar
Cov nyhuv ntawm peb hom cellulose ethers ntawm compressive thiab flexural zog ntawm cov cement-raws li cov kua qaub siab ntawm ntau lub hnub nyoog ntawm cov ntsiab lus ruaj khov ntawm 0.1% tau ua ntawm no.
Kev tshuaj xyuas lub zog thaum ntxov: Hais txog lub zog flexural, CMC muaj qee yam kev txhawb zog, thaum HPMC muaj qee yam kev txo qis; nyob rau hauv cov nqe lus ntawm compressive zog, kev koom ua ke ntawm cellulose ether muaj ib tug zoo xws li txoj cai nrog lub flexural zog; Lub viscosity ntawm HPMC cuam tshuam rau ob lub zog. Nws muaj cov nyhuv me me: nyob rau hauv cov nqe lus ntawm lub siab-fold piv, tag nrho peb cov cellulose ethers tuaj yeem txo qhov siab-fold piv thiab txhim kho qhov yooj yim ntawm mortar. Ntawm lawv, HPMC nrog viscosity ntawm 150,000 muaj qhov pom tseeb tshaj plaws.
(2) Xya-hnub lub zog sib piv cov txiaj ntsig
Xya-hnub lub zog tsom xam: Nyob rau hauv cov nqe lus ntawm flexural zog thiab compressive zog, muaj ib tug zoo xws li txoj cai rau peb-hnub lub zog. Piv nrog rau peb-hnub siab-folding, muaj me ntsis nce ntawm lub zog-folding zog. Txawm li cas los xij, kev sib piv ntawm cov ntaub ntawv ntawm tib lub sijhawm muaj hnub nyoog tuaj yeem pom qhov cuam tshuam ntawm HPMC ntawm kev txo qis ntawm qhov sib npaug ntawm qhov siab-folding. kuj pom tseeb.
(3) Nees nkaum yim hnub lub zog sib piv cov txiaj ntsig
Nees nkaum yim-hnub lub zog tsom xam: Hais txog lub zog flexural thiab compressive zog, muaj cov cai zoo sib xws rau peb-hnub lub zog. Lub zog flexural nce qeeb, thiab lub zog compressive tseem nce mus rau qee yam. Cov ntaub ntawv sib piv ntawm tib lub hnub nyoog qhia tau hais tias HPMC muaj txiaj ntsig zoo dua rau kev txhim kho qhov sib piv-folding.
Raws li qhov kev ntsuam xyuas lub zog ntawm ntu no, nws pom tau tias kev txhim kho ntawm brittleness ntawm mortar yog txwv los ntawm CMC, thiab qee zaum qhov compression-rau-fold piv yog nce, ua rau cov mortar ntau nkig. Nyob rau tib lub sijhawm, vim tias cov dej tuav tau ntau dua li ntawm HPMC, cov cellulose ether peb xav txog qhov kev ntsuas lub zog ntawm no yog HPMC ntawm ob lub viscosities. Txawm hais tias HPMC muaj qee yam cuam tshuam rau kev txo lub zog (tshwj xeeb tshaj yog rau lub zog thaum ntxov), nws muaj txiaj ntsig zoo los txo cov compression-refraction piv, uas yog qhov zoo rau lub zog ntawm cov tshuaj khib nyiab. Tsis tas li ntawd, ua ke nrog cov yam ntxwv cuam tshuam rau qhov fluidity hauv Tshooj 3, hauv kev tshawb fawb txog kev sib xyaw ntawm cov khoom siv sib xyaw thiab CE Hauv kev sim cov nyhuv, peb yuav siv HPMC (100,000) raws li qhov sib txuam CE.
4.1.2 Kev ntsuas ntsuas ntawm compressive thiab flexural lub zog ntawm cov ntxhia admixture siab fluidity mortar
Raws li kev ntsuam xyuas ntawm lub fluidity ntawm ntshiab slurry thiab mortar tov nrog admixtures nyob rau hauv lub dhau los tshooj, nws yuav pom tau hais tias lub fluidity ntawm silica fume yog obviously deteriorated vim cov dej loj xav tau, txawm hais tias nws muaj peev xwm theoretically txhim kho qhov ceev thiab lub zog rau. ib qho twg. , tshwj xeeb tshaj yog lub zog compressive, tab sis nws yog ib qho yooj yim uas yuav ua rau compression-rau-fold piv yuav loj heev, uas ua rau lub mortar brittleness feature zoo kawg li, thiab nws yog ib qho kev pom zoo tias silica fume nce lub shrinkage ntawm mortar. Nyob rau tib lub sij hawm, vim tsis muaj pob txha shrinkage ntawm coarse aggregate, tus nqi shrinkage ntawm mortar yog loj heev txheeb ze rau pob zeb. Rau mortar (tshwj xeeb tshwj xeeb mortar xws li kev sib txuas mortar thiab plastering mortar), qhov teeb meem loj tshaj plaws yog feem ntau shrinkage. Rau cov kab nrib pleb tshwm sim los ntawm kev poob dej, lub zog feem ntau tsis yog qhov tseem ceeb tshaj plaws. Yog li ntawd, silica fume raug muab pov tseg raws li cov khoom xyaw, thiab tsuas yog ya tshauv thiab ntxhia hmoov tau siv los tshawb txog cov txiaj ntsig ntawm nws cov txiaj ntsig sib xyaw nrog cellulose ether ntawm lub zog.
4.1.2.1 Compressive thiab flexural lub zog kuaj lub tswv yim ntawm siab fluidity mortar
Hauv qhov kev sim no, qhov kev faib ua feem ntawm mortar hauv 4.1.1 tau siv, thiab cov ntsiab lus ntawm cellulose ether raug kho ntawm 0.1% thiab piv nrog cov pab pawg dawb. Qhov ntau npaum li cas ntawm cov tshuaj sib tov yog 0%, 10%, 20% thiab 30%.
4.1.2.2 Compressive thiab flexural lub zog kuaj cov txiaj ntsig thiab kev tshuaj xyuas ntawm cov kua roj ntsha siab
Nws tuaj yeem pom los ntawm kev ntsuas lub zog compressive uas tus nqi 3d compressive zog tom qab ntxiv HPMC yog li 5/VIPa qis dua li ntawm pawg dawb paug. Nyob rau hauv dav dav, nrog rau qhov nce ntawm tus nqi ntawm admixture ntxiv, lub compressive lub zog qhia tau hais tias ib tug zuj zus. . Nyob rau hauv cov nqe lus ntawm admixtures, lub zog ntawm cov ntxhia hmoov pawg tsis muaj HPMC yog qhov zoo tshaj plaws, thaum lub zog ntawm cov hmoov tshauv ya ya me ntsis qis dua li cov ntxhia hmoov pawg, qhia tias cov hmoov ntxhia hmoov tsis zoo li cov cement, thiab nws cov kev koom ua ke yuav txo qis me ntsis thaum ntxov lub zog ntawm lub cev. Cov hmoov tshauv ya nrog kev ua haujlwm tsis zoo yuav txo lub zog kom pom tseeb. Yog vim li cas rau kev tsom xam yuav tsum yog hais tias cov yoov tshauv feem ntau koom nyob rau hauv lub thib ob hydration ntawm cement, thiab tsis pab txhawb rau lub zog thaum ntxov ntawm lub mortar.
Nws tuaj yeem pom los ntawm qhov ntsuas lub zog flexural qhov tseem ceeb uas HPMC tseem muaj qhov cuam tshuam tsis zoo rau lub zog flexural, tab sis thaum cov ntsiab lus ntawm cov khoom sib xyaw yog siab dua, qhov tshwm sim ntawm kev txo lub zog flexural tsis pom tseeb. Yog vim li cas tej zaum yuav yog cov dej tuav ntawm HPMC. Cov dej poob tus nqi ntawm qhov chaw ntawm lub mortar test block yog qeeb, thiab cov dej rau hydration kuj txaus.
Nyob rau hauv cov nqe lus ntawm admixtures, lub flexural lub zog qhia tau hais tias ib qho kev poob qis nrog qhov nce ntawm cov ntsiab lus admixture, thiab lub zog flexural ntawm cov pob zeb hauv av hmoov kuj yog me ntsis loj dua li ntawm pawg yoov tshauv, qhia tias kev ua ntawm cov ntxhia hmoov yog ntau tshaj li ntawm cov tshauv ya.
Nws tuaj yeem pom los ntawm kev suav tus nqi ntawm qhov sib piv-txo qhov sib ntxiv ntawm HPMC yuav ua rau txo qis qhov sib piv thiab txhim kho qhov hloov pauv ntawm cov tshuaj khib nyiab, tab sis nws yog qhov tseeb ntawm kev txo qis hauv lub zog compressive.
Nyob rau hauv cov nqe lus ntawm admixtures, raws li tus nqi ntawm admixture nce, lub compression-fold piv yuav nce, qhia tau hais tias lub admixture yog tsis conducive rau qhov yooj ntawm lub mortar. Tsis tas li ntawd, nws tuaj yeem pom tias qhov compression-fold piv ntawm lub mortar tsis muaj HPMC nce ntxiv nrog rau qhov sib ntxiv ntawm cov khoom sib xyaw. Qhov nce yog me ntsis loj dua, uas yog, HPMC tuaj yeem txhim kho qhov embrittlement ntawm mortar los ntawm kev sib ntxiv ntawm cov khoom siv rau qee yam.
Nws tuaj yeem pom tau tias rau lub zog compressive ntawm 7d, qhov tsis zoo ntawm cov khoom siv ntxiv tsis pom tseeb. Cov txiaj ntsig ntawm lub zog compressive yog kwv yees tib yam ntawm txhua qib admixture dosage, thiab HPMC tseem muaj qhov tsis zoo ntawm lub zog compressive. nyhuv.
Nws tuaj yeem pom tau tias nyob rau hauv cov ntsiab lus ntawm flexural zog, cov khoom sib xyaw muaj qhov cuam tshuam tsis zoo rau 7d flexural tsis kam tag nrho, thiab tsuas yog pab pawg ntawm cov hmoov ntxhia ua tau zoo dua, qhov tseem ceeb ntawm 11-12MPa.
Nws tuaj yeem pom tau tias cov tshuaj sib xyaw muaj qhov cuam tshuam tsis zoo nyob rau hauv cov nqe lus ntawm qhov sib piv indentation. Nrog rau qhov nce ntawm tus nqi ntawm cov tshuaj sib tov, qhov sib piv ntawm qhov indentation maj mam nce, uas yog, mortar yog nkig. HPMC tuaj yeem pom tseeb txo qhov compression-fold piv thiab txhim kho lub brittleness ntawm mortar.
Nws tuaj yeem pom tau tias los ntawm 28d compressive zog, cov khoom siv tau ua kom pom tseeb muaj txiaj ntsig zoo ntawm lub zog tom qab, thiab lub zog compressive tau nce los ntawm 3-5MPa, uas feem ntau yog vim muaj cov nyhuv micro-filling ntawm cov tshuaj tov. thiab cov tshuaj pozzolanic. Qhov thib ob hydration nyhuv ntawm cov khoom, ntawm ib sab, tuaj yeem siv thiab haus cov calcium hydroxide uas tsim los ntawm cov cement hydration (calcium hydroxide yog ib qho tsis muaj zog hauv cov tshuaj khib nyiab, thiab nws cov kev nplua nuj nyob hauv thaj chaw hloov pauv yog cuam tshuam rau lub zog), generating ntau hydration khoom, ntawm qhov tod tes, txhawb cov hydration degree ntawm cement thiab ua kom cov mortar ntau ntom. HPMC tseem muaj qhov cuam tshuam tsis zoo rau lub zog compressive, thiab lub zog tsis muaj zog tuaj yeem ncav cuag ntau dua 10MPa. Txhawm rau txheeb xyuas qhov laj thawj, HPMC qhia txog qee yam ntawm cov npuas huab cua hauv cov txheej txheem mortar sib xyaw, uas txo qhov compactness ntawm lub mortar lub cev. Qhov no yog ib qho laj thawj. HPMC tau yooj yim adsorbed rau ntawm qhov chaw ntawm cov khoom siv los ua ib zaj duab xis, cuam tshuam cov txheej txheem dej, thiab thaj chaw hloov pauv tsis muaj zog, uas tsis tsim nyog rau lub zog.
Nws tuaj yeem pom tau tias nyob rau hauv cov nqe lus ntawm 28d flexural zog, cov ntaub ntawv muaj ib tug loj dispersion tshaj compressive zog, tab sis qhov tsis zoo ntawm HPMC tseem tuaj yeem pom.
Nws tuaj yeem pom tau tias, los ntawm qhov pom ntawm qhov sib piv ntawm qhov compression-txo qis, HPMC feem ntau tau txais txiaj ntsig los txo qhov compression-txo piv thiab txhim kho qhov toughness ntawm mortar. Nyob rau hauv ib pab pawg neeg, nrog rau qhov nce ntawm tus nqi ntawm admixtures, qhov compression-refraction ratio nce. Kev soj ntsuam ntawm cov laj thawj qhia tau hais tias cov khoom sib xyaw muaj kev txhim kho hauv lub zog tom qab compressive, tab sis tsuas yog kev txhim kho nyob rau hauv lub zog flexural tom qab, ua rau cov compression-refraction ratio. kev txhim kho.
4.2 Compressive thiab flexural zog kuaj ntawm bonded mortar
Txhawm rau tshawb xyuas qhov cuam tshuam ntawm cellulose ether thiab admixture ntawm compressive thiab flexural zog ntawm bonded mortar, qhov kev sim kho cov ntsiab lus ntawm cellulose ether HPMC (viscosity 100,000) li 0.30% ntawm qhov hnyav qhuav ntawm mortar. thiab muab piv nrog rau pawg neeg dawb huv.
Admixtures (fly tshauv thiab slag hmoov) tseem raug kuaj ntawm 0%, 10%, 20%, thiab 30%.
4.2.1 Compressive thiab flexural lub zog kuaj lub tswv yim ntawm kev sib raug zoo mortar
4.2.2 Kev ntsuam xyuas thiab kev soj ntsuam ntawm lub zog ntawm compressive thiab flexural zog ntawm bonded mortar
Nws tuaj yeem pom los ntawm qhov kev sim uas HPMC pom tau tias tsis zoo nyob rau hauv cov nqe lus ntawm 28d compressive lub zog ntawm lub tsev cog khoom mortar, uas yuav ua rau lub zog txo los ntawm 5MPa, tab sis qhov taw qhia tseem ceeb rau kev txiav txim qhov zoo ntawm lub tsev cog khoom mortar tsis yog tus compressive zog, yog li nws yog txaus; Thaum cov ntsiab lus sib xyaw yog 20%, lub zog compressive yog qhov zoo tagnrho.
Nws tuaj yeem pom los ntawm qhov kev sim uas los ntawm qhov kev xav ntawm lub zog flexural, lub zog txo los ntawm HPMC tsis loj. Tej zaum nws yuav yog tias cov tshuaj khib nyiab muaj cov dej tsis zoo thiab cov yam ntxwv ntawm cov yas zoo piv nrog cov kua dej ntau. Cov txiaj ntsig zoo ntawm slipperiness thiab dej tuav tau zoo offset qee qhov tsis zoo ntawm kev qhia cov pa roj kom txo qis compactness thiab interface tsis muaj zog; admixtures tsis muaj kev cuam tshuam rau flexural zog, thiab cov ntaub ntawv ntawm ya tshauv pawg fluctuates me ntsis.
Nws tuaj yeem pom los ntawm cov kev sim uas, kom deb li deb ntawm qhov sib piv ntawm qhov siab-txo yog kev txhawj xeeb, feem ntau, qhov nce ntawm cov ntsiab lus admixture nce qhov sib piv ntawm qhov siab-txo, uas tsis zoo rau qhov toughness ntawm mortar; HPMC muaj cov txiaj ntsig zoo, uas tuaj yeem txo qhov siab-txo qhov piv ntawm O. 5 saum toj no, nws yuav tsum tau taw qhia tias, raws li "JG 149.2003 Expanded Polystyrene Board Thin Plaster Sab Nraud Sab Nraud Sab Nraud Rwb Txheej Txheej Txheem", feem ntau tsis muaj qhov yuav tsum tau ua. rau lub compression-folding piv nyob rau hauv lub nrhiav kom tau qhov Performance index ntawm lub tsev cog khoom mortar, thiab compression-folding piv yog tsuas yog siv los txwv lub brittleness ntawm plastering mortar, thiab qhov Performance index no tsuas yog siv raws li ib tug siv rau qhov yooj yim ntawm kev sib txuas. mortar.
4.3 Bonding Strength Test ntawm Bonding Mortar
Txhawm rau tshawb nrhiav kev cuam tshuam txoj cai ntawm kev sib xyaw ntawm cov cellulose ether thiab cov khoom sib xyaw ntawm lub zog ntawm daim ntawv cog lus, xa mus rau "JG / T3049.1998 Putty rau Tsev Sab Hauv" thiab "JG 149.2003 Expanded Polystyrene Board Thin Plastering Sab nrauv Phab Ntsa" Rwb thaiv tsev Qhov system ", peb tau ua tiav qhov kev ntsuas lub zog ntawm cov khoom sib txuas, siv cov khoom sib txuas sib txuas hauv Table 4.2.1, thiab kho cov ntsiab lus ntawm cellulose ether HPMC (viscosity 100,000) mus rau 0 ntawm qhov hnyav qhuav ntawm mortar .30%. , thiab piv nrog cov pab pawg neeg dawb paug.
Admixtures (fly tshauv thiab slag hmoov) tseem raug kuaj ntawm 0%, 10%, 20%, thiab 30%.
4.3.1 Cov qauv ntsuas ntawm daim ntawv cog lus lub zog ntawm daim ntawv cog lus mortar
4.3.2 Cov txiaj ntsig ntawm kev xeem thiab kev soj ntsuam ntawm daim ntawv cog lus lub zog ntawm daim ntawv cog lus mortar
(1) 14d daim ntawv cog lus lub zog kuaj cov txiaj ntsig ntawm kev sib koom ua ke mortar thiab cement mortar
Nws tuaj yeem pom los ntawm qhov kev sim uas cov pab pawg ntxiv nrog HPMC muaj txiaj ntsig zoo dua li cov pab pawg dawb huv, qhia tias HPMC muaj txiaj ntsig zoo rau kev sib koom ua ke, feem ntau vim tias cov dej tuav ntawm HPMC tiv thaiv cov dej ntawm qhov sib txuas ntawm cov mortar thiab cov cement mortar test block. Lub tsev cog khoom mortar ntawm lub interface yog tag nrho hydrated, yog li ua kom lub zog ntawm daim ntawv cog lus.
Nyob rau hauv cov nqe lus ntawm admixtures, daim ntawv cog lus lub zog yog siab heev ntawm ib tug npaum li cas ntawm 10%, thiab txawm hais tias lub hydration degree thiab ceev ntawm cov cement tuaj yeem txhim kho ntawm qhov ntau npaum li cas, nws yuav ua rau txo qis ntawm tag nrho cov dej ntawm cov cementitious. khoom, yog li ua rau stickiness. txo cov pob txha muaj zog.
Nws tuaj yeem pom los ntawm qhov kev sim uas hais txog qhov ntsuas tus nqi ntawm lub sijhawm ua haujlwm, cov ntaub ntawv yog qhov tsis sib xws, thiab cov khoom sib xyaw ua ke muaj qhov cuam tshuam me me, tab sis feem ntau, piv nrog cov thawj siv, muaj qee qhov txo qis, thiab Qhov txo qis ntawm HPMC yog me dua li ntawm pawg dawb paug, qhia tau hais tias nws tau txiav txim siab tias cov dej khaws cia ntawm HPMC muaj txiaj ntsig zoo rau kev txo cov dej dispersion, yog li ntawd qhov txo qis ntawm mortar bond zog txo tom qab 2.5h.
(2) 14d daim ntawv cog lus lub zog kuaj cov txiaj ntsig ntawm kev sib cog lus mortar thiab nthuav dav polystyrene board
Nws tuaj yeem pom los ntawm qhov kev sim no tias qhov ntsuas tus nqi ntawm lub zog ntawm daim ntawv cog lus ntawm cov mortar thiab polystyrene board yog ntau dua. Feem ntau, nws tuaj yeem pom tau tias cov pab pawg sib xyaw nrog HPMC muaj txiaj ntsig zoo dua li pab pawg dawb paug vim tias cov dej tuav tau zoo dua. Zoo, kev koom ua ke ntawm cov khoom sib xyaw ua ke txo qhov kev ruaj ntseg ntawm daim ntawv cog lus lub zog kuaj.
4.4 Tshooj Summary
1. Rau siab fluidity mortar, nrog rau lub hnub nyoog nce, lub compressive-fold piv muaj ib tug upward trend; Kev sib koom ua ke ntawm HPMC muaj qhov pom tseeb ntawm kev txo lub zog (qhov txo qis hauv lub zog compressive yog qhov pom tseeb dua), uas tseem ua rau txo qis ntawm compression-folding piv, uas yog, HPMC muaj peev xwm pab tau rau kev txhim kho mortar toughness. . Nyob rau hauv cov nqe lus ntawm peb-hnub lub zog, ya tshauv thiab ntxhia hmoov tuaj yeem ua rau me ntsis kev txhawb zog ntawm 10%, thaum lub zog txo qis ntawm qhov ntau npaum li cas, thiab cov crushing piv tau nce nrog qhov nce ntawm cov ntxhia additives; nyob rau hauv xya-hnub lub zog, Ob lub admixtures muaj me ntsis rau lub zog, tab sis tag nrho cov nyhuv ntawm ya tshauv lub zog txo yog tseem pom tseeb; nyob rau hauv cov nqe lus ntawm 28-hnub lub zog, ob qho tib si admixtures tau pab txhawb lub zog, compressive thiab flexural zog. Ob leeg tau nce me ntsis, tab sis lub siab-fold piv tseem nce nrog qhov nce ntawm cov ntsiab lus.
2. Rau 28d compressive thiab flexural lub zog ntawm kev sib raug zoo mortar, thaum lub admixture cov ntsiab lus yog 20%, lub compressive thiab flexural zog kev ua tau zoo dua, thiab cov admixture tseem ua rau ib tug me me nce nyob rau hauv lub compressive-fold piv, reflecting nws Adverse. cuam tshuam rau lub toughness ntawm mortar; HPMC ua rau txo qis zog, tab sis tuaj yeem txo qhov compression-rau-fold piv.
3. Hais txog lub zog ntawm daim ntawv cog lus mortar, HPMC muaj qee yam kev cuam tshuam rau lub zog ntawm daim ntawv cog lus. Kev tsom xam yuav tsum yog tias nws cov dej tuav cov nyhuv txo qhov poob ntawm mortar noo noo thiab ua kom muaj dej txaus; Kev sib raug zoo ntawm cov ntsiab lus ntawm qhov sib tov tsis tu ncua, thiab tag nrho cov kev ua tau zoo dua nrog cov cement mortar thaum cov ntsiab lus yog 10%.
Tshooj 5 Ib txoj hauv kev los kwv yees qhov Compressive Strength ntawm mortar thiab pob zeb
Hauv tshooj no, ib txoj hauv kev los kwv yees lub zog ntawm cov khoom siv cement raws li kev sib xyaw ua haujlwm coefficient thiab FERET lub zog txoj kev xav tau npaj. Peb thawj zaug xav txog mortar ua ib yam tshwj xeeb ntawm pob zeb tsis muaj coarse aggregates.
Nws paub zoo tias lub zog compressive yog qhov taw qhia tseem ceeb rau cov khoom siv cement (concrete thiab mortar) siv los ua cov khoom siv. Txawm li cas los xij, vim muaj ntau yam cuam tshuam, tsis muaj tus qauv lej uas tuaj yeem kwv yees nws qhov hnyav. Qhov no ua rau qee qhov tsis yooj yim rau kev tsim, tsim khoom thiab siv cov mortar thiab pob zeb. Cov qauv uas twb muaj lawm ntawm pob zeb muaj zog muaj lawv tus kheej qhov zoo thiab qhov tsis zoo: qee qhov kwv yees lub zog ntawm pob zeb los ntawm qhov porosity ntawm pob zeb los ntawm qhov pom ntawm qhov porosity ntawm cov khoom siv; qee qhov tsom ntsoov rau kev cuam tshuam ntawm cov dej-binder piv kev sib raug zoo ntawm lub zog. Daim ntawv no tsuas yog sib txuas cov kev ua haujlwm coefficient ntawm pozzolanic admixture nrog Feret lub zog txoj kev xav, thiab ua rau qee qhov kev txhim kho kom nws muaj tseeb dua los kwv yees lub zog compressive.
5.1 Feret's Strength Theory
Xyoo 1892, Feret tau tsim cov qauv lej ntxov tshaj plaws rau kev kwv yees compressive zog. Nyob rau hauv lub premise ntawm muab cov khoom siv raw, cov qauv rau kev kwv yees lub zog ua vaj tse yog npaj rau thawj zaug.
Qhov zoo ntawm cov qauv no yog tias cov grout concentration, uas cuam tshuam nrog cov pob zeb ua kom muaj zog, muaj lub ntsiab lus zoo ntawm lub cev. Nyob rau tib lub sijhawm, kev cuam tshuam ntawm cov ntsiab lus ntawm huab cua yog coj mus rau hauv tus account, thiab qhov tseeb ntawm cov qauv tuaj yeem ua pov thawj ntawm lub cev. Qhov laj thawj rau cov qauv no yog tias nws qhia cov ntaub ntawv hais tias muaj kev txwv rau cov pob zeb ua kom muaj zog uas tuaj yeem tau txais. Qhov tsis zoo yog tias nws tsis quav ntsej txog kev cuam tshuam ntawm cov khoom sib sau ua ke, cov duab particle thiab hom sib sau ua ke. Thaum kwv yees lub zog ntawm cov pob zeb sib txawv ntawm cov hnub nyoog sib txawv los ntawm kev kho tus nqi K, kev sib raug zoo ntawm lub zog sib txawv thiab hnub nyoog yog qhia raws li cov txheej txheem sib txawv los ntawm kev sib koom ua ke. Qhov nkhaus tsis sib haum nrog qhov xwm txheej tiag tiag (tshwj xeeb tshaj yog thaum muaj hnub nyoog ntev dua). Tau kawg, cov qauv no tau thov los ntawm Feret yog tsim los rau cov mortar ntawm 10.20MPa. Nws tsis tuaj yeem hloov kho kom haum rau kev txhim kho ntawm cov pob zeb ua kom muaj zog thiab kev cuam tshuam ntawm cov khoom siv ntxiv vim qhov kev nce qib ntawm kev siv tshuab mortar pob zeb.
Nws raug suav hais tias ntawm no tias lub zog ntawm pob zeb (tshwj xeeb tshaj yog cov pob zeb zoo tib yam) feem ntau yog nyob ntawm lub zog ntawm cov cement mortar hauv cov pob zeb, thiab lub zog ntawm cov cement mortar nyob ntawm qhov ntom ntawm cov cement muab tshuaj, uas yog, qhov feem pua. ntawm cov khoom siv cementitious hauv paste.
Txoj kev xav yog ze ze rau qhov cuam tshuam ntawm qhov tsis muaj qhov sib piv ntawm lub zog. Txawm li cas los xij, vim hais tias txoj kev xav tau muab tso ua ntej, qhov cuam tshuam ntawm cov khoom sib xyaw ntawm cov pob zeb ua kom muaj zog tsis tau txiav txim siab. Raws li qhov no, daim ntawv no yuav qhia txog qhov sib xyaw ua ke ntawm cov coefficient raws li kev ua haujlwm coefficient rau kev kho ib feem. Nyob rau tib lub sijhawm, raws li cov qauv no, kev cuam tshuam coefficient ntawm porosity ntawm pob zeb muaj zog yog rov tsim dua.
5.2 Kev ua haujlwm coefficient
Kev ua haujlwm coefficient, Kp, yog siv los piav txog cov txiaj ntsig ntawm cov ntaub ntawv pozzolanic ntawm lub zog compressive. Pom tseeb, nws nyob ntawm qhov xwm txheej ntawm cov khoom siv pozzolanic nws tus kheej, tab sis kuj nyob ntawm lub hnub nyoog ntawm cov pob zeb. Lub hauv paus ntsiab lus ntawm kev txiav txim siab coefficient ntawm kev ua si yog los sib piv lub zog compressive ntawm tus qauv mortar nrog lub zog compressive ntawm lwm cov mortar nrog pozzolanic admixtures thiab hloov cov cement nrog tib tus nqi ntawm cov cement zoo (lub teb chaws p yog qhov kev xeem coefficient. Siv surrogate. feem pua). Qhov piv ntawm ob qhov kev siv zog no yog hu ua kev ua haujlwm coefficient fO), qhov twg t yog lub hnub nyoog ntawm cov tshuaj khib nyiab thaum lub sijhawm kuaj. Yog tias fO) tsawg dua 1, qhov kev ua ntawm pozzolan tsawg dua li cov cement r. Hloov pauv, yog tias fO) ntau dua 1, lub pozzolan muaj ntau dua reactivity (qhov no feem ntau tshwm sim thaum silica fume ntxiv).
Rau cov kev ua si feem ntau siv coefficient ntawm 28-hnub compressive lub zog, raws li ((GBT18046.2008 Granulated blast furnace slag hmoov siv hauv cov cement thiab pob zeb) H90, cov dej num coefficient ntawm granulated blast furnace slag hmoov yog nyob rau hauv tus qauv cement mortar Lub zog piv tau los ntawm kev hloov 50% xis mas raws li qhov kev xeem raws li ((GBT1596.2005 ya tshauv siv hauv cov cement thiab pob zeb), qhov kev ua haujlwm coefficient ntawm ya tshauv yog tau tom qab hloov 30% cement raws li tus qauv cement mortar. test Raws li "GB.T27690.2011 Silica Fume rau mortar thiab pob zeb", qhov kev ua haujlwm coefficient ntawm silica fume yog lub zog piv tau los ntawm kev hloov 10% cement raws li cov qauv cement mortar test.
Feem ntau, granulated moj tej tawg rauv slag hmoov Kp = 0.95～1.10, ya tshauv Kp = 0.7-1.05, silica fume Kp = 1.00～1.15. Peb xav tias nws cov nyhuv ntawm lub zog yog ywj siab ntawm cov cement. Ntawd yog, cov txheej txheem ntawm cov tshuaj tiv thaiv pozzolanic yuav tsum tau tswj los ntawm kev ua haujlwm ntawm pozzolan, tsis yog los ntawm cov kua qaub nag lossis daus ntawm cov cement hydration.
5.3 Influence coefficient ntawm admixture ntawm lub zog
5.4 Kev cuam tshuam coefficient ntawm kev siv dej ntawm lub zog
5.5 Influence coefficient ntawm aggregate muaj pes tsawg leeg ntawm lub zog
Raws li cov kev xav ntawm cov xibfwb PK Mehta thiab PC Aitcin hauv Tebchaws Meskas, txhawm rau ua tiav cov haujlwm zoo tshaj plaws thiab lub zog ntawm HPC tib lub sijhawm, qhov sib piv ntawm cov cement slurry rau aggregate yuav tsum yog 35: 65 [4810] Vim tias ntawm cov plasticity thiab fluidity tag nrho cov aggregate ntawm pob zeb tsis hloov ntau. Ntev npaum li lub zog ntawm cov khoom siv hauv paus nws tus kheej ua tau raws li qhov yuav tsum tau ua ntawm cov kev qhia tshwj xeeb, kev cuam tshuam ntawm tag nrho cov nyiaj ntawm cov khoom sib sau ntawm lub zog yog tsis quav ntsej, thiab tag nrho cov feem tseem ceeb tuaj yeem txiav txim siab hauv 60-70% raws li qhov yuav tsum tau ua. .
Nws yog theoretically ntseeg tias qhov piv ntawm ntxhib thiab nplua aggregates yuav muaj qee yam cuam tshuam rau lub zog ntawm pob zeb. Raws li peb txhua tus paub, qhov tsis muaj zog tshaj plaws hauv pob zeb yog qhov kev hloov pauv ntawm thaj chaw sib xyaw thiab cov cement thiab lwm cov khoom siv cementitious pastes. Yog li ntawd, qhov kawg tsis ua hauj lwm ntawm cov qhob qhob yog vim qhov kev puas tsuaj ntawm thawj zaug ntawm qhov kev hloov pauv hauv cheeb tsam nyob rau hauv kev ntxhov siab los ntawm yam xws li kev thauj khoom lossis kev hloov pauv kub. tshwm sim los ntawm kev txhim kho txuas ntxiv ntawm cov kab nrib pleb. Yog li ntawd, thaum lub degree ntawm hydration zoo sib xws, qhov loj ntawm qhov kev hloov pauv cheeb tsam yog, qhov yooj yim dua qhov pib tawg yuav loj hlob mus rau hauv ntev los ntawm kev tawg tom qab kev ntxhov siab concentration. Uas yog hais tias, qhov ntau coarse aggregates nrog ntau cov duab geometric tsis tu ncua thiab cov nplai loj dua hauv thaj chaw hloov pauv hloov pauv, qhov ntau dua qhov kev ntxhov siab ntau dua qhov tshwm sim ntawm qhov pib tawg, thiab macroscopically manifested tias cov pob zeb muaj zog nce nrog qhov nce ntawm cov ntxhib aggregate. piv. txo. Txawm li cas los xij, lub ntsiab lus saum toj no yog tias nws yuav tsum yog cov xuab zeb nruab nrab nrog cov av nkos tsawg heev.
Cov xuab zeb tus nqi kuj muaj qee yam cuam tshuam rau qhov poob qis. Yog li ntawd, cov xuab zeb tuaj yeem raug preset los ntawm cov kev xav tau poob qis, thiab tuaj yeem txiav txim siab li ntawm 32% mus rau 46% rau cov pob zeb zoo tib yam.
Tus nqi thiab ntau yam ntawm admixtures thiab ntxhia admixtures yog txiav txim los ntawm kev sim sib tov. Hauv cov pob zeb zoo tib yam, cov ntxhia ntxiv yuav tsum tsawg dua 40%, thaum lub pob zeb muaj zog, silica fume yuav tsum tsis pub tshaj 10%. Cov cement yuav tsum tsis txhob ntau tshaj 500kg / m3.
5.6 Daim ntawv thov ntawm txoj kev kwv yees no los qhia kev sib xyaw ua piv txwv suav nrog
Cov khoom siv yog raws li nram no:
Cov cement yog E042.5 cement tsim los ntawm Lubi Cement Factory, Laiwu City, Shandong Province, thiab nws qhov ceev yog 3.19 / cm3;
Cov hmoov tshauv ya yog qib II pob tshauv uas tsim los ntawm Jinan Huangtai Fais Fab Cog, thiab nws cov dej num coefficient yog O. 828, nws qhov ceev yog 2.59 / cm3;
silica fume tsim los ntawm Shandong Sanmei Silicon Material Co., Ltd.
Taian qhuav dej xuab zeb muaj qhov ntom ntawm 2.6 g / cm3, qhov ntom ntom ntawm 1480kg / m3, thiab qhov zoo ntawm Mx = 2.8;
Jinan Ganggou tsim 5-'25mm qhuav crushed pob zeb nrog ib tug loj ceev ntawm 1500kg / m3 thiab ib tug ceev ntawm txog 2.7∥cm3;
Cov dej-txo tus neeg saib xyuas siv yog tus kheej-ua aliphatic high-efficiency dej-txo tus neeg saib xyuas, nrog rau cov dej-txo tus nqi ntawm 20%; cov koob tshuaj tshwj xeeb yog txiav txim siab sim raws li qhov xav tau ntawm kev poob qis. Kev sim npaj ntawm C30 pob zeb, qhov poob qis yuav tsum muaj ntau dua 90mm.
1. formulation zog
2. xuab zeb zoo
3. Kev txiav txim siab ntawm qhov cuam tshuam ntawm txhua qhov kev siv zog
4. Thov kev siv dej
5. Qhov ntau npaum li cas ntawm cov dej-txo tus neeg sawv cev yog hloov raws li qhov yuav tsum tau muaj ntawm slump. Qhov ntau npaum li cas yog 1%, thiab Ma = 4kg yog ntxiv rau qhov loj.
6. Nyob rau hauv no txoj kev, lub xam piv yog tau
7. Tom qab kev sim sib tov, nws tuaj yeem ua tau raws li qhov yuav tsum tau ua kom poob qis. Qhov ntsuas 28d compressive zog yog 39.32MPa, uas ua tau raws li qhov yuav tsum tau ua.
5.7 Tshooj Summary
Nyob rau hauv cov ntaub ntawv ntawm tsis quav ntsej qhov kev sib cuam tshuam ntawm cov admixtures I thiab F, peb tau sib tham txog cov dej num coefficient thiab Feret lub zog txoj kev xav, thiab tau txais kev cuam tshuam ntawm ntau yam ntawm lub zog ntawm pob zeb:
1 Concrete admixture influence coefficient
2 Kev cuam tshuam coefficient ntawm kev siv dej
3 Kev cuam tshuam coefficient ntawm kev sib sau ua ke
4 Qhov sib piv tiag tiag. Nws tau raug txheeb xyuas tias 28d lub zog kwv yees txoj kev ua vaj tse tau txhim kho los ntawm kev ua haujlwm coefficient thiab Feret lub zog txoj kev xav tau pom zoo nrog qhov xwm txheej tiag tiag, thiab nws tuaj yeem siv los coj kev npaj ntawm mortar thiab pob zeb.
Tshooj 6 Xaus thiab Outlook
6.1 Cov ntsiab lus tseem ceeb
Thawj qhov sib piv cov slurry huv thiab mortar fluidity xeem ntawm ntau yam ntxhia admixtures sib xyaw nrog peb hom cellulose ethers, thiab pom cov cai hauv qab no:
1. Cellulose ether muaj qee yam cuam tshuam thiab ua rau huab cua nkag. Ntawm lawv, CMC muaj cov dej tsis muaj zog khaws cia ntawm cov tshuaj tsawg, thiab muaj qee yam poob thaum lub sijhawm; Thaum HPMC muaj qhov tseem ceeb ntawm cov dej tuav thiab cov nyhuv thickening, uas txo cov fluidity ntawm ntshiab pulp thiab mortar, thiab cov thickening nyhuv ntawm HPMC nrog siab nominal viscosity yog me ntsis pom tseeb.
2. Ntawm cov khoom sib xyaw, qhov pib thiab ib nrab-teev fluidity ntawm ya tshauv ntawm cov slurry huv si thiab mortar tau txhim kho rau qee yam. 30% cov ntsiab lus ntawm kev kuaj slurry huv tuaj yeem nce txog 30 hli; lub fluidity ntawm cov ntxhia hmoov ntawm cov slurry huv si thiab mortar Tsis muaj kev cai lij choj ntawm kev cuam tshuam; Txawm hais tias cov ntsiab lus ntawm silica fume tsis tshua muaj, nws qhov tshwj xeeb ultra-fineness, ceev cov tshuaj tiv thaiv, thiab muaj zog adsorption ua rau nws muaj qhov txo qis ntawm cov dej huv ntawm slurry thiab mortar, tshwj xeeb tshaj yog thaum tov nrog 0.15% HPMC, yuav muaj phenomenon uas lub khob hliav qab tuag tsis tuaj yeem sau. Piv nrog rau cov txiaj ntsig kev xeem ntawm cov slurry huv si, nws pom tau tias cov nyhuv ntawm cov khoom sib xyaw hauv cov tshuaj khib nyiab yuav tsis muaj zog. Hais txog kev tswj ntshav, ya tshauv thiab ntxhia hmoov tsis pom tseeb. Silica fume tuaj yeem txo cov ntshav ntau, tab sis nws tsis yog qhov tsim nyog rau kev txo qis ntawm mortar fluidity thiab poob lub sijhawm, thiab nws yooj yim los txo lub sijhawm ua haujlwm.
3. Nyob rau hauv qhov kev hloov pauv ntau npaum li cas, cov yam ntxwv cuam tshuam rau cov dej ntws ntawm cov cement-based slurry, qhov ntau npaum li cas ntawm HPMC thiab silica fume yog qhov tseem ceeb, ob qho tib si hauv kev tswj cov ntshav thiab kev tswj ntawm lub xeev ntws, yog qhov pom tseeb. Kev cuam tshuam ntawm thee tshauv thiab ntxhia hmoov yog qhov thib ob thiab ua lub luag haujlwm pabcuam hloov kho.
4. Peb hom cellulose ethers muaj qee yam huab cua-entraining nyhuv, uas yuav ua rau npuas dej ntws mus rau saum npoo ntawm cov slurry ntshiab. Txawm li cas los xij, thaum cov ntsiab lus ntawm HPMC nce mus txog ntau dua 0.1%, vim yog cov viscosity siab ntawm slurry, cov npuas tsis tuaj yeem khaws cia hauv slurry. dej ntws. Yuav muaj npuas nyob rau saum npoo ntawm mortar nrog fluidity saum 250ram, tab sis cov pab pawg dawb paug tsis muaj cellulose ether feem ntau tsis muaj npuas lossis tsuas yog ib qho me me ntawm npuas, qhia tias cellulose ether muaj qee yam huab cua nkag thiab ua rau slurry. khov. Tsis tas li ntawd, vim cov viscosity ntau dhau ntawm cov tshuaj khib nrog cov dej tsis zoo, nws yog qhov nyuaj rau cov pa npuas kom ntab los ntawm tus kheej qhov hnyav ntawm cov slurry, tab sis khaws cia rau hauv mortar, thiab nws lub zog ntawm lub zog tsis tuaj yeem ua tau. tsis quav ntsej.
Part II Mortar Mechanical Properties
1. Rau siab fluidity mortar, nrog rau lub hnub nyoog nce, lub crushing ratio muaj ib tug upward sib; Qhov sib ntxiv ntawm HPMC muaj qhov cuam tshuam tseem ceeb ntawm kev txo lub zog (qhov txo qis hauv lub zog compressive yog qhov pom tseeb dua), uas tseem ua rau kev sib tsoo qhov txo qis ntawm qhov piv, uas yog, HPMC muaj peev xwm pab tau rau kev txhim kho ntawm mortar toughness. Nyob rau hauv cov nqe lus ntawm peb-hnub lub zog, ya tshauv thiab ntxhia hmoov tuaj yeem ua rau me ntsis kev txhawb zog ntawm 10%, thaum lub zog txo qis ntawm qhov ntau npaum li cas, thiab cov crushing piv tau nce nrog qhov nce ntawm cov ntxhia additives; nyob rau hauv xya-hnub lub zog, Ob lub admixtures muaj me ntsis rau lub zog, tab sis tag nrho cov nyhuv ntawm ya tshauv lub zog txo yog tseem pom tseeb; nyob rau hauv cov nqe lus ntawm 28-hnub lub zog, ob qho tib si admixtures tau pab txhawb lub zog, compressive thiab flexural zog. Ob leeg tau nce me ntsis, tab sis lub siab-fold piv tseem nce nrog qhov nce ntawm cov ntsiab lus.
2. Rau 28d compressive thiab flexural lub zog ntawm kev sib raug zoo mortar, thaum lub admixture cov ntsiab lus yog 20%, lub compressive thiab flexural zog yog zoo dua, thiab cov admixture tseem ua rau ib tug me me nce nyob rau hauv lub compressive-rau-fold piv, xav txog nws. cuam tshuam rau lub mortar. Cov teebmeem ntawm toughness; HPMC ua rau muaj qhov txo qis hauv lub zog.
3. Hais txog lub zog ntawm daim ntawv cog lus mortar, HPMC muaj cov txiaj ntsig zoo rau lub zog ntawm daim ntawv cog lus. Kev tsom xam yuav tsum yog tias nws cov dej tuav cov nyhuv txo qhov poob dej hauv cov tshuaj khib nyiab thiab ua kom muaj dej txaus ntau dua. Lub zog daim ntawv cog lus muaj feem xyuam nrog cov khoom sib xyaw. Kev sib raug zoo ntawm cov tshuaj tsis tu ncua, thiab kev ua haujlwm tag nrho yog qhov zoo dua nrog cov cement mortar thaum noj ntau npaum li 10%.
4. CMC tsis haum rau cov cement-based cementitious cov ntaub ntawv, nws cov dej tuav cov nyhuv tsis pom tseeb, thiab tib lub sijhawm, nws ua rau cov mortar ntau nkig; thaum HPMC tuaj yeem txo qhov compression-rau-fold piv thiab txhim kho qhov toughness ntawm mortar, tab sis nws yog tus nqi ntawm kev txo qis hauv compressive zog.
5. Cov kev xav tau ntawm fluidity thiab lub zog, HPMC cov ntsiab lus ntawm 0.1% yog qhov tsim nyog dua. Thaum ya tshauv yog siv rau cov txheej txheem los yog cov mortar uas yuav tsum tau ceev hardening thiab thaum ntxov lub zog, qhov ntau npaum li cas yuav tsum tsis txhob siab dhau, thiab qhov siab tshaj plaws npaum li cas yog hais txog 10%. Kev xav tau; xav txog tej yam xws li qhov tsis zoo ntim stability ntawm cov ntxhia hmoov thiab silica fume, lawv yuav tsum tau tswj ntawm 10% thiab n 3% raws li. Cov teebmeem ntawm admixtures thiab cellulose ethers tsis muaj kev sib raug zoo, nrog
muaj kev ywj pheej.
Qhov thib peb Nyob rau hauv rooj plaub ntawm tsis quav ntsej qhov kev sib cuam tshuam ntawm cov khoom sib xyaw, los ntawm kev sib tham ntawm cov dej num coefficient ntawm cov ntxhia admixtures thiab Feret lub zog txoj kev xav, cov kev cai ntawm ntau yam ntawm lub zog ntawm pob zeb (mortar) tau txais:
1. Mineral Admixture Influence Coefficient
2. cuam tshuam coefficient ntawm kev siv dej
3. Kev cuam tshuam ntawm kev sib sau ua ke
4. Qhov kev sib piv tiag tiag qhia tau hais tias 28d lub zog kwv yees txoj kev ntawm cov pob zeb txhim kho los ntawm kev ua haujlwm coefficient thiab Feret lub zog txoj kev xav tau pom zoo nrog qhov xwm txheej tiag tiag, thiab nws tuaj yeem siv los qhia kev npaj ntawm mortar thiab pob zeb.
6.2 Qhov Tsis Zoo thiab Kev Pom Zoo
Daim ntawv no tsuas yog kawm txog qhov fluidity thiab mechanical zog ntawm cov tshuaj ntxuav kom huv thiab mortar ntawm binary cementitious system. Cov txiaj ntsig thiab kev cuam tshuam ntawm kev sib koom ua ke ntawm ntau cov khoom siv cementitious yuav tsum tau kawm ntxiv. Hauv txoj kev sim, mortar sib xws thiab stratification tuaj yeem siv. Cov nyhuv ntawm cellulose ether ntawm qhov sib xws thiab dej tuav ntawm mortar yog kawm los ntawm qib ntawm cellulose ether. Tsis tas li ntawd, lub microstructure ntawm mortar nyob rau hauv lub compound kev txiav txim ntawm cellulose ether thiab mineral admixture kuj yuav tsum tau kawm.
Cellulose ether tam sim no yog ib qho tseem ceeb ntawm cov khoom sib xyaw ntawm ntau yam mortars. Nws cov dej tuav tau zoo ua rau lub sijhawm ua haujlwm ntawm cov mortar, ua rau cov mortar muaj cov thixotropy zoo, thiab txhim kho cov tawv tawv ntawm cov mortar. Nws yooj yim rau kev tsim kho; thiab daim ntawv thov ntawm ya tshauv thiab ntxhia hmoov raws li kev lag luam pov tseg hauv mortar kuj tuaj yeem tsim kev lag luam zoo thiab ib puag ncig
Post lub sij hawm: Sep-29-2022