Cellulose ether ntawm slag xuab zeb mortar

Kev siv P·II 52.5 qib cement raws li cov khoom siv cementitious thiab steel slag xuab zeb raws li cov khoom sib xyaw zoo, cov hlau slag xuab zeb nrog cov kua dej siab thiab lub zog siab yog npaj los ntawm kev ntxiv cov tshuaj ntxiv xws li dej reducer, latex hmoov thiab defoamer tshwj xeeb mortar, thiab cov teebmeem ntawm ob qhov sib txawv. viscosities (2000mPa·s thiab 6000mPa·s) ntawm hydroxypropyl methylcellulose ether (HPMC) ntawm nws cov dej tuav, fluidity thiab lub zog tau kawm. Cov txiaj ntsig tau pom tias: (1) Ob leeg HPMC2000 thiab HPMC6000 tuaj yeem ua kom cov dej tuav tau zoo ntawm cov tshuaj khib nyiab tshiab thiab txhim kho nws cov dej tuav; (2) Thaum cov ntsiab lus ntawm cellulose ether tsawg, qhov cuam tshuam ntawm cov kua dej ntawm cov tshuaj khib nyiab tsis pom tseeb. Thaum nws tau nce mus rau 0.25% lossis siab dua, nws muaj qee yam kev puas tsuaj rau cov kua dej ntawm cov tshuaj khib nyiab, cov uas cuam tshuam rau HPMC6000 yog qhov pom tseeb dua; (3) qhov sib ntxiv ntawm cellulose ether tsis muaj kev cuam tshuam rau 28-hnub compressive zog ntawm mortar, tab sis qhov sib ntxiv ntawm HPMC2000 Lub sij hawm tsis zoo, nws pom tseeb tsis zoo rau lub zog flexural ntawm cov hnub nyoog sib txawv, thiab tib lub sijhawm txo qis. thaum ntxov (3 hnub thiab 7 hnub) compressive zog ntawm mortar; (4) Qhov sib ntxiv ntawm HPMC6000 muaj qee yam cuam tshuam rau lub zog flexural ntawm cov hnub nyoog sib txawv, tab sis qhov txo qis qis dua li ntawm HPMC2000. Hauv daim ntawv no, nws tau txiav txim siab tias HPMC6000 yuav tsum raug xaiv thaum npaj steel slag xuab zeb tshwj xeeb mortar nrog cov kua dej siab, cov dej tuav tau zoo thiab lub zog siab, thiab qhov ntau npaum li cas yuav tsum tsis txhob ntau dua 0.20%.

Cov lus tseem ceeb:steel slag xuab zeb; cellulose ether; viscosity; kev ua haujlwm; zog

kev taw qhia

Steel slag yog ib tug by-product ntawm zus tau tej cov hlau. Nrog rau txoj kev loj hlob ntawm kev lag luam hlau thiab hlau, kev tso tawm txhua xyoo ntawm cov hlau slag tau nce li ntawm 100 lab tons hauv xyoo tas los no, thiab cov teeb meem ntawm kev khaws cia vim qhov tsis ua tiav ntawm kev siv cov peev txheej raws sij hawm yog qhov hnyav heev. Yog li ntawd, kev siv peev txheej thiab pov tseg cov hlau slag los ntawm kev tshawb fawb thiab kev siv tau zoo yog qhov teeb meem uas tsis tuaj yeem tsis quav ntsej. Steel Slag muaj cov yam ntxwv ntawm kev ua kom siab, cov qauv siv tawv thiab muaj zog siv los hloov cov xuab zeb hauv cov xuab zeb xis los yog pob zeb. Steel slag kuj muaj qee yam reactivity. Hlau slag yog hauv av rau hauv cov hmoov zoo (steel slag hmoov). Tom qab sib tov rau hauv pob zeb, nws tuaj yeem siv cov nyhuv pozzolanic, uas pab txhim kho lub zog ntawm slurry thiab txhim kho kev hloov pauv ntawm cov pob zeb sib xyaw thiab slurry. cheeb tsam, yog li ua kom lub zog ntawm cov pob zeb. Txawm li cas los xij, nws yuav tsum tau them sai sai rau cov hlau slag tso tawm yam tsis muaj kev ntsuas, nws sab hauv dawb calcium oxide, dawb magnesium oxide thiab RO theem yuav ua rau lub ntim tsis zoo ntawm cov hlau slag, uas feem ntau txwv tsis pub siv cov hlau slag li ntxhib thiab zoo aggregates. Daim ntawv thov nyob rau hauv cement mortar los yog pob zeb. Wang Yuji et al. Cov txheej txheem sib txawv steel slag kho thiab pom tias cov hlau slag kho los ntawm cov txheej txheem kub txheej txheem muaj kev ruaj ntseg zoo thiab tuaj yeem tshem tawm nws qhov teeb meem nthuav dav hauv cov cement pob zeb, thiab cov txheej txheem kub kho cov txheej txheem tau ua tiav hauv Shanghai No. 3 Hlau thiab Hlau Cog rau. thawj zaug. Ntxiv nrog rau qhov teeb meem ntawm kev ruaj ntseg, steel slag aggregates kuj muaj cov yam ntxwv ntawm cov pores ntxhib, ntau lub kaum sab xis, thiab ib qho me me ntawm cov khoom hydration ntawm qhov chaw. Thaum siv los ua cov sib sau ua ke los npaj mortar thiab pob zeb, lawv cov kev ua haujlwm feem ntau cuam tshuam. Tam sim no, nyob rau hauv lub premise ntawm kev ruaj ntseg ntim, siv steel slag raws li zoo aggregate los npaj tshwj xeeb mortar yog ib qho tseem ceeb cov kev taw qhia rau kev siv ntawm steel slag. Txoj kev tshawb no pom tias ntxiv dej reducer, latex hmoov, cellulose ether, huab cua-entraining tus neeg saib xyuas thiab defoamer rau steel slag xuab zeb mortar tuaj yeem txhim kho qhov sib xyaw ua haujlwm thiab kev ua tau zoo ntawm cov hlau slag xuab zeb mortar raws li xav tau. Tus kws sau ntawv tau siv cov kev ntsuas ntawm kev ntxiv cov hmoov latex thiab lwm yam khoom siv los npaj steel slag xuab zeb siab-zog kho mortar. Hauv kev tsim thiab siv cov tshuaj khib nyiab, cellulose ether yog cov tshuaj lom neeg ntau tshaj plaws. Feem ntau siv cellulose ethers hauv mortar yog hydroxypropyl methyl cellulose ether (HPMC) thiab hydroxyethyl methyl cellulose ether (HEMC). ) Tos. Cellulose ether tuaj yeem txhim kho kev ua haujlwm ntawm mortar rau qhov loj, xws li muab mortar zoo heev khaws cia los ntawm thickening, tab sis ntxiv cellulose ether kuj yuav cuam tshuam cov fluidity, huab cua cov ntsiab lus, teem sij hawm thiab hardening ntawm mortar. Ntau yam khoom.

Yuav kom coj tau zoo dua kev txhim kho thiab kev siv steel slag xuab zeb mortar, raws li kev tshawb fawb yav dhau los ntawm steel slag xuab zeb mortar, daim ntawv no siv ob hom viscosities (2000mPa.·s thiab 6000mPa·s) ntawm hydroxypropyl methyl cellulose ether (HPMC) Ua cov kev tshawb fawb txog kev cuam tshuam ntawm steel slag xuab zeb siab-lub zog mortar ntawm kev ua haujlwm (fluidity thiab dej tuav) thiab compressive thiab flexural zog.

1. Kev sim ib feem

1.1 Cov khoom siv raw

Cement: Onoda P·II 52.5 qib cement.

Hlau slag xuab zeb: Lub converter steel slag tsim los ntawm Shanghai Baosteel yog ua los ntawm cov txheej txheem kub, nrog ib tug loj ceev ntawm 1910kg / m³, belongs rau nruab nrab xuab zeb, thiab ib tug fineness modulus ntawm 2.3.

Dej reducer: polycarboxylate dej reducer (PC) tsim los ntawm Shanghai Gaotie Chemical Co., Ltd., hauv daim ntawv hmoov.

Latex hmoov: Qauv 5010N muab los ntawm Wacker Chemicals (China) Co., Ltd.

Defoamer: Code P803 khoom muab los ntawm German Mingling Chemical Group, hmoov, ntom 340kg / m³, grey nplai 34% (800°C), pH tus nqi 7.2 (20°C DIN ISO 976, 1% hauv DIST, dej).

Cellulose ether: hydroxypropyl methylcellulose ether muab los ntawmKima Chemical Co., Ltd., uas muaj viscosity ntawm 2000mPa·s yog tsim los ua HPMC2000, thiab ib qho nrog viscosity ntawm 6000mPa·s raug xaiv los ua HPMC6000.

Cov dej sib xyaw: dej kais dej.

1.2 Kev sim piv txwv

Cov cement-xuab zeb piv ntawm steel slag-xuab zeb mortar npaj nyob rau hauv thaum ntxov theem ntawm kev xeem yog 1: 3 (mass ratio), cov dej-cement ratio yog 0.50 (mass ratio), thiab cov npaum li cas ntawm polycarboxylate superplasticizer yog 0.25%. (cement pawg feem pua, tib yam hauv qab no.), cov latex hmoov cov ntsiab lus yog 2.0%, thiab cov ntsiab lus defoamer yog 0.08%. Rau kev sim sib piv, qhov ntau npaum li cas ntawm ob lub cellulose ethers HPMC2000 thiab HPMC6000 yog 0.15%, 0.20%, 0.25% thiab 0.30%, feem.

1.3 Test method

Mortar Fluidity Test Method: Npaj mortar raws li GB / T 17671-1999 "Cement Mortar Strength Test (ISO Method)", siv cov pwm kuaj hauv GB / T2419-2005 "Cement Mortar Fluidity Test Method", thiab do ncuav lub mortar zoo mus rau hauv cov pwm kuaj sai sai, so tawm cov mortar ntau tshaj nrog ib tug scraper, nqa lub xeem pwm vertically upward, thiab thaum lub mortar tsis ntws, ntsuas qhov siab tshaj plaws txoj kab uas hla ntawm qhov chaw ntawm lub mortar thiab txoj kab uas hla nyob rau hauv txoj kab ntsug, thiab coj tus nqi nruab nrab, qhov tshwm sim yog qhov tseeb rau 5mm.

Kev ntsuam xyuas cov dej tuav tus nqi ntawm mortar yog ua raws li txoj kev teev tseg hauv JGJ / T 70-2009 "Test Methods for Basic Properties of Building Mortar".

Qhov kev sim ntawm compressive zog thiab flexural zog ntawm mortar yog ua raws li txoj kev teev nyob rau hauv GB / T 17671-1999, thiab cov hnub nyoog xeem yog 3 hnub, 7 hnub thiab 28 hnub raws li.

2. Cov txiaj ntsig thiab kev sib tham

2.1 Cov nyhuv ntawm cellulose ether ntawm kev ua haujlwm ntawm steel slag xuab zeb mortar

Los ntawm cov txiaj ntsig ntawm cov ntsiab lus sib txawv ntawm cellulose ether ntawm cov dej tuav ntawm steel slag xuab zeb mortar, nws tuaj yeem pom tau tias ntxiv HPMC2000 lossis HPMC6000 tuaj yeem txhim kho cov dej tuav ntawm cov khoom sib xyaw tshiab. Nrog rau qhov nce ntawm cov ntsiab lus ntawm cellulose ether, cov dej tuav tus nqi ntawm mortar tau nce siab heev thiab tom qab ntawd tseem nyob ruaj khov. Ntawm lawv, thaum cov ntsiab lus ntawm cellulose ether tsuas yog 0.15%, cov dej tuav tus nqi ntawm cov mortar yog nce los ntawm ze li ntawm 10% piv nrog qhov tsis muaj qhov sib ntxiv, ncav cuag 96%; Thaum cov ntsiab lus nce mus rau 0.30%, cov dej tuav tus nqi ntawm cov mortar yog siab li 98.5%. Nws tuaj yeem pom tau tias qhov sib ntxiv ntawm cellulose ether tuaj yeem txhim kho cov dej tuav ntawm mortar.

Los ntawm kev cuam tshuam ntawm ntau npaum li cas ntawm cellulose ether ntawm fluidity ntawm steel slag xuab zeb mortar, nws tuaj yeem pom tau tias thaum noj cellulose ether yog 0.15% thiab 0.20%, nws tsis muaj qhov cuam tshuam rau qhov fluidity ntawm mortar; Thaum qhov ntau npaum li cas nce mus rau 0.25% lossis siab dua, muaj kev cuam tshuam ntau dua ntawm cov dej ntws, tab sis qhov fluidity tseem tuaj yeem khaws cia ntawm 260mm thiab siab dua; Thaum ob lub cellulose ethers nyob rau hauv tib tus nqi, piv nrog HPMC2000, qhov cuam tshuam tsis zoo ntawm HPMC6000 ntawm mortar fluidity yog pom tseeb dua.

Hydroxypropyl methyl cellulose ether yog ib qho uas tsis yog-ionic polymer nrog cov dej tuav zoo, thiab nyob rau hauv ib qho kev sib txawv, qhov ntau dua qhov viscosity, qhov dej tuav tau zoo dua thiab qhov pom tseeb dua cov nyhuv thickening. Yog vim li cas yog tias pawg hydroxyl ntawm nws cov saw molecular thiab cov pa atom ntawm ether daim ntawv cog lus tuaj yeem tsim hydrogen bonds nrog dej molecules, ua dej dawb rau hauv cov dej khi. Yog li ntawd, nyob rau tib qhov ntau npaum li cas, HPMC6000 tuaj yeem ua kom cov viscosity ntawm cov mortar ntau dua li HPMC2000, txo cov kua dej ntawm cov tshuaj khib nyiab, thiab ua kom cov dej tuav tau ntau dua. Daim Ntawv 10 piav qhia txog qhov tshwm sim saum toj no los ntawm kev tsim cov tshuaj viscoelastic tom qab cellulose ether yaj hauv dej, thiab qhia txog cov khoom ntws los ntawm deformation. Nws tuaj yeem pom tau tias cov hlau slag mortar npaj rau hauv daim ntawv no muaj cov dej ntws loj, uas tuaj yeem ncav cuag 295 hli yam tsis muaj kev sib xyaw, thiab nws qhov deformation kuj loj heev. Thaum cov cellulose ether ntxiv, cov slurry yuav dhau nkig ntws, thiab nws lub peev xwm los kho cov duab me me, yog li ua rau txo qis hauv kev txav mus los.

2.2 Cov nyhuv ntawm cellulose ether ntawm lub zog ntawm steel slag xuab zeb mortar

Qhov sib ntxiv ntawm cellulose ether tsis tsuas yog cuam tshuam rau kev ua haujlwm ntawm steel slag xuab zeb mortar, tab sis kuj cuam tshuam rau nws cov khoom siv kho tshuab.

Los ntawm cov nyhuv ntawm ntau npaum li cas ntawm cellulose ether ntawm lub zog compressive ntawm steel slag xuab zeb mortar, nws tuaj yeem pom tau tias tom qab ntxiv HPMC2000 thiab HPMC6000, lub zog compressive ntawm mortar ntawm txhua qhov ntau npaum li cas nce nrog hnub nyoog. Ntxiv HPMC2000 tsis muaj kev cuam tshuam rau 28-hnub compressive lub zog ntawm mortar, thiab lub zog hloov pauv tsis loj; thaum HPMC2000 muaj kev cuam tshuam ntau dua rau thaum ntxov (3-hnub thiab 7-hnub) lub zog, uas qhia txog qhov sib txawv ntawm qhov pom tseeb txo qis, txawm hais tias qhov ntau npaum li cas nce mus rau 0.25% thiab saum toj no, lub zog compressive thaum ntxov tau nce me ntsis, tab sis tseem qis dua qhov tsis muaj. ntxiv. Thaum cov ntsiab lus ntawm HPMC6000 qis dua 0.20%, qhov cuam tshuam ntawm 7-hnub thiab 28-hnub compressive lub zog tsis pom tseeb, thiab 3-hnub compressive zog txo qis. Thaum cov ntsiab lus ntawm HPMC6000 nce mus rau 0.25% thiab siab dua, lub zog 28-hnub tau nce mus rau qee qhov, thiab tom qab ntawd txo qis; lub zog 7-hnub poob, thiab tom qab ntawd nyob ruaj khov; lub zog 3-hnub poob qis hauv qhov ruaj khov. Yog li, nws tuaj yeem txiav txim siab tias cov cellulose ethers nrog ob lub viscosities ntawm HPMC2000 thiab HPMC6000 tsis muaj qhov cuam tshuam tsis zoo rau 28-hnub compressive zog ntawm mortar, tab sis qhov sib ntxiv ntawm HPMC2000 muaj qhov pom tseeb tsis zoo rau lub zog thaum ntxov ntawm mortar.

HPMC2000 muaj qhov sib txawv ntawm qhov tsis zoo ntawm lub zog flexural ntawm mortar, txawm nyob rau theem pib (3 hnub thiab 7 hnub) lossis theem lig (28 hnub). Qhov sib ntxiv ntawm HPMC6000 kuj tseem muaj qee qhov kev cuam tshuam tsis zoo rau lub zog flexural ntawm mortar, tab sis qhov kev cuam tshuam me me dua li ntawm HPMC2000.

Ntxiv nrog rau kev ua haujlwm ntawm dej tuav thiab thickening, cellulose ether kuj tseem ncua cov txheej txheem dej ntawm cov cement. Nws yog tsuas yog los ntawm adsorption ntawm cellulose ether molecules ntawm cement hydration khoom, xws li calcium silicate hydrate gel thiab Ca (OH) 2, los tsim ib txheej txheej; Tsis tas li ntawd, qhov viscosity ntawm cov pore daws nce, thiab cellulose ether cuam tshuam Kev tsiv teb tsaws ntawm Ca2 + thiab SO42- hauv cov kua pore ncua cov txheej txheem dej. Yog li ntawd, lub zog thaum ntxov (3 hnub thiab 7 hnub) ntawm mortar tov nrog HPMC raug txo.

Ntxiv cellulose ether rau hauv mortar yuav tsim ib tug loj tus naj npawb ntawm cov npuas loj nrog ib txoj kab uas hla ntawm 0.5-3 hli vim huab cua-entraining nyhuv ntawm cellulose ether, thiab cellulose ether membrane qauv yog adsorbed rau saum npoo ntawm cov npuas, uas rau ib tug qee yam plays lub luag haujlwm hauv stabilizing cov npuas. Lub luag haujlwm, yog li ua kom tsis muaj zog ntawm cov defoamer hauv cov tshuaj khib. Txawm hais tias cov huab cua tsim ua npuas zoo li cov pob bearings nyob rau hauv cov khoom sib xyaw tshiab, uas txhim kho kev ua haujlwm, thaum lub mortar yog solidified thiab hardened, feem ntau ntawm cov pa npuas tseem nyob rau hauv lub mortar los tsim cov pores ywj siab, uas txo qhov pom tseeb ntom ntawm mortar. . Lub zog compressive thiab flexural zog txo raws li.

Nws tuaj yeem pom tau tias thaum npaj steel slag xuab zeb tshwj xeeb mortar nrog lub siab fluidity, siab dej tuav tus nqi thiab siab zog, nws raug nquahu kom siv HPMC6000, thiab qhov ntau npaum li cas yuav tsum tsis txhob ntau tshaj 0.20%.

nyob rau hauv xaus

Cov teebmeem ntawm ob lub viscosities ntawm cellulose ethers (HPMC200 thiab HPMC6000) ntawm cov dej tuav, fluidity, compressive thiab flexural zog ntawm steel slag xuab zeb mortar tau kawm los ntawm kev sim, thiab cov txheej txheem ntawm kev ua ntawm cellulose ether hauv steel slag xuab zeb mortar tau soj ntsuam. Cov lus xaus hauv qab no:

(1) Txawm hais tias ntxiv HPMC2000 los yog HPMC6000, cov dej tuav tus nqi ntawm cov khoom sib xyaw tshiab slag xuab zeb mortar tuaj yeem txhim kho tau zoo, thiab nws cov dej tuav tau zoo tuaj yeem txhim kho.

(2) Thaum qhov ntau npaum li cas qis dua 0.20%, qhov cuam tshuam ntawm kev ntxiv HPMC2000 thiab HPMC6000 ntawm cov dej ntws ntawm steel slag xuab zeb mortar tsis pom tseeb. Thaum cov ntsiab lus nce mus rau 0.25% thiab siab dua, HPMC2000 thiab HPMC6000 muaj qee yam cuam tshuam tsis zoo rau cov dej ntws ntawm steel slag xuab zeb mortar, thiab qhov cuam tshuam tsis zoo ntawm HPMC6000 yog qhov pom tseeb dua.

(3) Qhov sib ntxiv ntawm HPMC2000 thiab HPMC6000 tsis muaj kev cuam tshuam rau 28-hnub compressive zog ntawm steel slag xuab zeb mortar, tab sis HPMC2000 muaj qhov cuam tshuam ntau dua ntawm lub zog compressive ntawm mortar, thiab lub zog flexural kuj pom tseeb tsis zoo. Qhov sib ntxiv ntawm HPMC6000 muaj qee yam tsis zoo rau lub zog flexural ntawm steel slag-sand mortar nyob rau txhua lub hnub nyoog, tab sis cov qib ntawm cov nyhuv yog qis dua li ntawm HPMC2000.