Cellulose Ether Viscosity Hloov ntawm Cement raws plaster

Thickening yog ib qho kev hloov pauv tseem ceeb ntawm cellulose ether ntawm cov khoom siv cement. Cov teebmeem ntawm cellulose ether cov ntsiab lus, viscometer rotation ceev thiab kub ntawm viscosity hloov ntawm cellulose ether hloov cementraws li plaster tau kawm. Cov txiaj ntsig tau pom tias cov viscosity ntawm cov cementraws li plaster nce tsis tu ncua nrog kev nce ntawm cellulose ether cov ntsiab lus, thiab viscosity ntawm cellulose ether tov thiab cementraws li plaster muaj "composite superposition effect"; pseudoplasticity ntawm cellulose ether hloov cementraws li plaster yog qis dua li cov cement ntshiabraws li plaster, thiab cov viscosity Qhov qis dua qhov kev sib hloov ceev ntawm qhov ntsuas, lossis qis dua qhov viscosity ntawm cellulose ether hloov cov cementraws li plaster, los yog qis dua cov ntsiab lus ntawm cellulose ether, qhov pom tseeb dua pseudoplasticity ntawm cellulose ether hloov cementraws li plaster; Nrog rau kev sib xyaw ua ke ntawm hydration, viscosity ntawm cellulose ether hloov cov cementraws li plaster yuav nce lossis txo. Ntau hom cellulose ether muaj qhov sib txawv ntawm cov viscosity ntawm cov cement hloovraws li plaster.

Cov lus tseem ceeb: cellulose ether; cementraws li plaster; viscosity

0,Ua ntej

Cellulose ethers feem ntau yog siv los ua cov dej tuav dej thiab cov thickeners rau cov khoom siv cement. Raws li cov khoom sib txawv, cellulose ethers siv hauv cov khoom siv cement feem ntau suav nrog methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxyethyl methyl cellulose Ether (Hydroxyethyl methyl cellulose, HEMC) thiab hydroxypropyl methyl cellulose (Hydroxypropyl MCyl cellulose), ntawm cov HPMC thiab HEMC feem ntau siv.

Thickening yog ib qho kev hloov pauv tseem ceeb ntawm cellulose ether ntawm cov khoom siv cement. Cellulose ether tuaj yeem ua rau cov khib nyiab ntub dej nrog cov viscosity zoo, ua kom muaj peev xwm sib txuas ntawm cov khib nyiab ntub thiab cov txheej txheej, thiab txhim kho kev ua haujlwm ntawm cov tshuaj khib nyiab. Nws tseem tuaj yeem ua rau kom muaj kev sib haum xeeb thiab muaj peev xwm tiv thaiv kev sib cais ntawm cov khoom siv cement-based tshiab, thiab tiv thaiv kev delamination, cais thiab los ntshav ntawm mortar thiab pob zeb.

Cov nyhuv thickening ntawm cellulose ether ntawm cov ntaub ntawv cement-based tuaj yeem ntsuas ntau los ntawm cov qauv rheological ntawm cov khoom siv cement. Cement-raws li cov ntaub ntawv feem ntau suav hais tias yog Bingham kua, uas yog, thaum cov ntaub ntawv shear stress r tsawg dua qhov kev ntxhov siab r0, cov khoom tseem nyob hauv nws cov qauv qub thiab tsis ntws; Thaum lub shear stress r tshaj qhov kev nyuaj siab r0, cov khoom undergoes ntws deformation, thiab shear stress Qhov kev nyuaj siab r muaj ib tug linear kev sib raug zoo nrog lub strain rate y, uas yog, r = r0 + f·y, qhov twg f yog cov yas viscosity. Cellulose ethers feem ntau ua rau muaj kev ntxhov siab thiab cov yas viscosity ntawm cov ntaub ntawv cement-based, txawm li cas los xij, cov khoom siv qis dua ua rau txo qis kev ntxhov siab thiab cov yas viscosity, feem ntau yog vim huab cua-entraining nyhuv ntawm cellulose ethers. Patural txoj kev tshawb fawb qhia tau hais tias qhov hnyav molecular ntawm cellulose ether nce, qhov kev ntxhov siab ntawm cov cement.raws li plaster txo qis, thiab qhov sib xws nce.

Lub viscosity ntawm cov cementraws li plaster yog ib qho tseem ceeb Performance index los ntsuam xyuas cov thickening nyhuv ntawm cellulose ether ntawm cement-based cov ntaub ntawv. Qee cov ntaub ntawv tau tshawb nrhiav txoj cai hloov viscosity ntawm cellulose ether tov, tab sis tseem tsis muaj kev tshawb fawb txog kev cuam tshuam ntawm cellulose ether ntawm viscosity hloov ntawm cement.raws li plaster. Nyob rau tib lub sijhawm, raws li ntau hom kev hloov pauv, muaj ntau hom cellulose ethers. Qhov cuam tshuam ntawm ntau hom thiab viscosities ntawm cellulose ethers ntawm kev hloov ntawm cov cementraws li plaster viscosity kuj yog ib qho teeb meem kev txhawj xeeb heev hauv kev siv cellulose ethers. Txoj haujlwm no siv lub viscometer rotational los kawm txog kev hloov viscosity ntawm cellulose ether hloov cov cement slurries ntawm ntau hom thiab viscosities nyob rau hauv txawv poly-ash ratios, rotational speeds thiab kub.

1. Kev sim

1.1 Cov khoom siv raw

(1) Cellulose ether. Rau hom cellulose ethers uas nquag siv hauv kuv lub teb chaws raug xaiv, suav nrog 1 hom MC, 1 hom HEC, 2 hom HPMC thiab 2 hom HEMC, ntawm cov viscosities ntawm 2 hom HPMC thiab 2 hom HEMC tau pom tseeb. txawv. Lub viscosity ntawm cellulose ether raug kuaj los ntawm NDJ-1B rotational viscometer (Shanghai Changji Company), qhov concentration ntawm cov tshuaj ntsuam xyuas yog 1.0% lossis 2.0%, qhov kub yog 20.°C, thiab kev sib hloov ceev yog 12r / min.

(2) Cement. Ordinary Portland cement tsim los ntawm Wuhan Huaxin Cement Co., Ltd·O 42.5 (GB 175-2007).

1.2 Kev ntsuas viscosity ntawm cellulose ether kua

Siv ib qho cellulose ether qauv ntawm qhov zoo thiab ntxiv rau 250mL iav beaker, ces ntxiv 250g dej kub ntawm txog 90.°C; do tag nrho nrog ib lub iav pas nrig kom cov cellulose ether tsim ib tug uniform dispersion system nyob rau hauv cov dej kub, thiab nyob rau tib lub sij hawm muab lub beaker txias nyob rau hauv cov huab cua. Thaum cov tshuaj pib tsim viscosity thiab yuav tsis precipitate dua, nres stirring tam sim ntawd; Thaum cov tshuaj tau txias nyob rau hauv cov huab cua kom txog rau thaum cov xim yog uniform, muab lub beaker nyob rau hauv ib tug tas mus li dej kub da dej, thiab ua kom qhov kub thiab txias mus rau qhov ntsuas kub. Qhov yuam kev yog± 0.1°C; tom qab 2h (xam los ntawm lub sijhawm sib cuag ntawm cellulose ether nrog dej kub), ntsuas qhov kub ntawm qhov chaw ntawm cov tshuaj nrog tus pas ntsuas kub. Ntau lawm) rotor tso rau hauv qhov kev daws teeb meem rau qhov ntsuas qhov tob, tom qab sawv ntsug rau 5min, ntsuas nws cov viscosity.

1.3 Kev ntsuas viscosity ntawm cellulose ether hloov cov cementraws li plaster

Ua ntej qhov kev sim, khaws tag nrho cov ntaub ntawv raw ntawm qhov ntsuas kub, ntsuas qhov loj ntawm cellulose ether thiab cement, sib tov kom huv si, thiab ntxiv cov kais dej ntawm qhov ntsuas kub rau hauv 250mL iav beaker nrog dej-cement ratio ntawm 0.65; Tom qab ntawd ntxiv cov hmoov qhuav rau hauv lub beaker thiab tos 3 feeb do kom huv si nrog lub iav pas nrig rau 300 zaug, ntxig lub rotor ntawm lub viscometer rotational (NDJ-1B hom, tsim los ntawm Shanghai Changji Geological Instrument Co., Ltd.) rau hauv daws mus rau qhov tob uas tau teev tseg, thiab ntsuas nws cov viscosity tom qab sawv ntsug li 2 feeb. Txhawm rau kom tsis txhob muaj kev cuam tshuam ntawm cov cement hydration tshav kub ntawm cov viscosity test ntawm cov cementraws li plaster ntau li ntau tau, viscosity ntawm cellulose ether hloov cementraws li plaster yuav tsum tau kuaj thaum cov cement nyob rau hauv kev sib cuag nrog dej rau 5 feeb.

2. Cov txiaj ntsig thiab kev tshuaj xyuas

2.1 Cov nyhuv ntawm cellulose ether cov ntsiab lus

Tus nqi ntawm cellulose ether ntawm no yog hais txog qhov loj ntawm cellulose ether rau cement, uas yog, qhov piv ntawm polyash. Los ntawm kev cuam tshuam ntawm P2, E2 thiab H1 peb hom cellulose ethers ntawm viscosity hloov ntawm cementraws li plaster ntawm ntau npaum li cas (0.1%, 0.3%, 0.6% thiab 0.9%), nws tuaj yeem pom tau tias tom qab ntxiv cellulose ether, viscosity ntawm cement.raws li plaster viscosity nce; Raws li tus nqi ntawm cellulose ether nce, viscosity ntawm cementraws li plaster nce tsis tu ncua, thiab qhov ntau ntawm kev nce hauv viscosity ntawm cov cementraws li plaster kuj yuav loj dua.

Thaum cov dej-cement piv yog 0.65 thiab cov ntsiab lus cellulose ether yog 0.6%, xav txog cov dej siv los ntawm kev pib hydration ntawm cement, qhov concentration ntawm cellulose ether txheeb ze rau dej yog li 1%. Thaum cov concentration yog 1%, P2, E2 thiab H1 aqueous daws Cov viscosities yog 4990mPa·S, 5070 mPa·S thiab 5250mPa·s raws; Thaum cov dej-cement piv yog 0.65, viscosity ntawm cov cement ntshiabraws li plaster ua 836mpa·S. Txawm li cas los xij, viscosities ntawm P2, E2 thiab H1 peb cellulose ether hloov cov cement slurries yog 13800mPa·S, 12900 mPa·S thiab 12700mPa·s raws. Obviously, viscosity ntawm cellulose ether hloov cementraws li plaster Tsis yog qhov viscosity ntawm cellulose ether tov thiab qhov yooj yim ntxiv ntawm cov viscosity ntawm cov cement ntshiabraws li plaster Nws yog qhov tseem ceeb tshaj qhov sib npaug ntawm ob lub viscosities, uas yog, viscosity ntawm cellulose ether tov thiab viscosity ntawm cov cement.raws li plaster muaj "composite superposition effect". Lub viscosity ntawm cellulose ether tov los ntawm lub zog hydrophilicity ntawm hydroxyl pawg thiab ether bonds nyob rau hauv cellulose ether molecules thiab peb-dimensional network qauv tsim los ntawm cellulose ether molecules nyob rau hauv cov tshuaj; viscosity ntawm cov cementraws li plaster los ntawm lub network tsim ntawm cement hydration khoom qauv. Txij li thaum cov khoom siv polymer thiab cement hydration feem ntau tsim cov qauv sib txuas sib txuas, hauv cellulose ether hloov cov cement.raws li plaster3-dimensional network qauv ntawm cellulose ether thiab lub network qauv ntawm cov cement hydration cov khoom yog intertwined, thiab cellulose ether molecules Adsorption nrog cement hydration khoom ua ke ua ib tug "composite superposition effect", uas ua rau kom lub zuag qhia tag nrho viscosity ntawm cement.raws li plaster; Txij li thaum ib qho cellulose ether molecule tuaj yeem cuam tshuam nrog ntau lub cellulose ether molecules thiab cov khoom siv cement hydration, Yog li ntawd, nrog kev nce ntawm cellulose ether cov ntsiab lus, qhov ntom ntawm cov qauv network nce ntau dua li qhov nce ntawm cellulose ether molecules, thiab cov viscosity ntawm cov cement.raws li plaster nce tsis tu ncua; Tsis tas li ntawd, qhov ceev hydration ntawm cement yuav tsum tau hnov ​​​​ib feem ntawm cov dej. , uas yog sib npaug rau kev nce cov concentration ntawm cellulose ether, uas kuj yog ib qho laj thawj rau kev nce ntxiv hauv cov viscosity ntawm cov cement.raws li plaster.

Txij li cellulose ether thiab cementraws li plaster muaj "composite superposition effect" nyob rau hauv viscosity, nyob rau hauv tib lub cellulose ether cov ntsiab lus thiab dej-cement piv, cov viscosity ntawm cellulose ether hloov cementraws li plaster nrog pom tseeb sib txawv thaum lub concentration yog 2% Qhov viscosity txawv tsis loj, piv txwv li, viscosities ntawm P2 thiab E2 yog 48000mPa·s thiab 36700mPa·s feem nyob rau hauv aqueous tov nrog concentration ntawm 2%. S, qhov sib txawv tsis pom tseeb; viscosities ntawm E1 thiab E2 hauv 2% aqueous tov yog 12300mPa·S thiab 36700mPa·s feem, qhov txawv yog loj heev, tab sis cov viscosities ntawm lawv hloov cement paste yog 9800mPa·S thiab 12900mPa feem·S, qhov sib txawv tau txo qis heev, yog li thaum xaiv cellulose ether hauv engineering, nws tsis tas yuav mus nrhiav cov cellulose ether viscosity ntau dhau. Ntxiv mus, nyob rau hauv kev siv engineering siv, qhov concentration ntawm cellulose ether txheeb ze rau dej feem ntau kuj qis. Piv txwv li, nyob rau hauv ib tug zoo tib yam plastering mortar, cov dej-cement piv feem ntau yog hais txog 0.65, thiab cov ntsiab lus ntawm cellulose ether yog 0.2% mus rau 0.6%. Qhov concentration ntawm dej yog nruab nrab ntawm 0.3% thiab 1%.

Nws tseem tuaj yeem pom los ntawm cov txiaj ntsig kev sim uas sib txawv ntawm cov cellulose ethers muaj qhov sib txawv ntawm cov viscosity ntawm cov cement.raws li plaster. Thaum cov concentration yog 1%, viscosities ntawm P2, E2 thiab H1 peb hom cellulose ether aqueous daws yog 4990mPa·s, 5070 mpa·S thiab 5250mPa·S feem, viscosity ntawm H1 tov yog siab tshaj, tab sis viscosity ntawm P2, E2 thiab H1 peb hom cellulose ether Lub viscosities ntawm ether-hloov cement slurries yog 13800mPa.·S, 12900 mPa·S thiab 12700mPa·S feem, thiab cov viscosity ntawm H1 hloov cov cement slurries yog qhov qis tshaj. Qhov no yog vim hais tias cellulose ethers feem ntau muaj cov nyhuv ntawm kev ncua cov cement hydration. Ntawm peb hom cellulose ethers, HEC, HPMC thiab HEMC, HEC muaj lub peev xwm tshaj plaws los ncua cov cement hydration. Yog li ntawd, hauv H1 hloov cov cementraws li plaster, vim tias cov cement hydration qeeb qeeb, lub network qauv ntawm cov khoom siv cement hydration tsim qeeb, thiab cov viscosity yog qhov qis tshaj.

2.2 Qhov cuam tshuam ntawm kev sib hloov

Los ntawm kev cuam tshuam ntawm kev sib hloov ceev ntawm viscometer ntawm viscosity ntawm cov cement ntshiabraws li plaster thiab cellulose ether hloov cov cementraws li plaster, nws tuaj yeem pom tau tias thaum qhov kev sib hloov ceev nce, viscosity ntawm cellulose ether hloov cementraws li plaster thiab ntshiab cementraws li plaster txo qis mus rau qhov sib txawv, uas yog, lawv txhua tus muaj cov cuab yeej ntawm shear thinning thiab belongs rau pseudoplastic kua. Qhov me dua qhov kev sib hloov, qhov ntau dua qhov viscosity ntawm tag nrho cov cementraws li plaster nrog tus nqi sib hloov, uas yog, qhov pom tseeb dua qhov pseudoplasticity ntawm cov cementraws li plaster. Nrog rau qhov nce ntawm qhov kev sib hloov, qhov nkhaus ntawm viscosity txo qis ntawm cov cementraws li plaster maj mam ua flatter, thiab pseudoplasticity tsis muaj zog. Piv nrog cov cement ntshiabraws li plaster, pseudoplasticity ntawm cellulose ether hloov cementraws li plaster tsis muaj zog, uas yog hais tias, kev koom ua ke ntawm cellulose ether txo cov pseudoplasticity ntawm cov cement.raws li plaster.

Los ntawm kev cuam tshuam ntawm kev sib hloov ceev ntawm viscosity ntawm cementraws li plaster nyob rau hauv ntau hom cellulose ether thiab viscosities, nws tuaj yeem paub tias cementraws li plaster hloov nrog cov cellulose ethers sib txawv muaj qhov sib txawv pseudoplastic lub zog, thiab qhov me dua qhov viscosity ntawm cellulose ether, qhov siab dua qhov viscosity ntawm cov cement hloov.raws li plaster. Qhov pom tseeb dua qhov pseudoplasticity ntawm cov cementraws li plaster yog; pseudoplasticity ntawm cov cement hloovraws li plaster tsis muaj qhov txawv txav nrog ntau hom cellulose ethers nrog viscosities zoo sib xws. Los ntawm P2, E2 thiab H1 peb hom cellulose ether hloov cov cementraws li plaster nyob rau hauv ntau npaum li cas (0.1%, 0.3%, 0.6% thiab 0.9%), qhov cuam tshuam ntawm kev sib hloov ceev ntawm viscosity tuaj yeem paub, P2, E2 thiab H1 peb hom fiber ntau Cov cement slurries hloov nrog dawb ether muaj cov txiaj ntsig zoo ib yam. : Thaum tus nqi ntawm cellulose ether txawv, lawv cov pseudoplasticity txawv. Qhov me me ntawm cellulose ether, lub zog pseudoplasticity ntawm cov cement hloov.raws li plaster.

Tom qab cov cement nyob rau hauv kev sib cuag nrog dej, cov cement hais nyob rau saum npoo yog sai sai hydrated, thiab cov khoom hydration (tshwj xeeb tshaj yog CSH gel) tsim ib tug agglomeration qauv. Thaum muaj kev taw qhia shear quab yuam nyob rau hauv cov kev daws, lub agglomeration qauv yuav qhib, thiaj li hais tias raws li cov kev taw qhia ntawm lub shear quab yuam lub directional flow kuj yog txo, li no exhibiting cov cuab yeej ntawm shear thinning. Cellulose ether yog ib hom macromolecule nrog cov qauv asymmetric. Thaum cov tshuaj tseem nyob, cov cellulose ether molecules tuaj yeem muaj ntau yam kev taw qhia. Thaum muaj ib tug directional shear quab yuam nyob rau hauv cov kev daws, cov saw ntev ntawm lub molecule yuav tig thiab mus raws. Cov kev taw qhia ntawm lub zog shear raug txo, ua rau txo qis hauv kev khiav hauj lwm, thiab tseem nthuav tawm cov cuab yeej ntawm shear thinning. Piv nrog rau cov khoom siv cement hydration, cellulose ether molecules yog hloov tau yooj yim dua thiab muaj peev xwm buffering rau shear quab yuam. Yog li ntawd, piv nrog cov cement ntshiabraws li plaster, pseudoplasticity ntawm cellulose ether hloov cementraws li plaster tsis muaj zog, thiab, raws li cov viscosity lossis cov ntsiab lus ntawm cellulose ether nce, cov nyhuv buffering ntawm cellulose ether molecules ntawm shear force yog pom tseeb dua. Plasticity yuav qaug zog.

2.3 Kev cuam tshuam ntawm qhov kub thiab txias

Los ntawm cov nyhuv ntawm qhov kub thiab txias (20°C, 27°C thiab 35°C) ntawm viscosity ntawm cellulose ether hloov cementraws li plaster, nws tuaj yeem pom tias thaum cov ntsiab lus ntawm cellulose ether yog 0.6%, raws li qhov kub thiab txias, cov cement ntshiab.raws li plaster thiab M1 Lub viscosity ntawm cov cement hloovraws li plaster nce, thiab viscosity ntawm lwm cov cellulose ether hloov cov cementraws li plaster txo qis, tab sis qhov txo qis tsis loj, thiab cov viscosity ntawm H1 hloov cov cementraws li plaster txo qis tshaj plaws. Raws li E2 hloov kho cementraws li plaster muaj kev txhawj xeeb, thaum qhov sib piv ntawm polyash yog 0.6%, viscosity ntawm cov cementraws li plaster txo nrog qhov nce ntawm qhov kub thiab txias, thiab thaum qhov sib piv ntawm polyash yog 0.3%, viscosity ntawm cov cement.raws li plaster nce nrog qhov nce ntawm qhov kub thiab txias.

Feem ntau hais lus, vim qhov txo qis ntawm kev sib cuam tshuam ntawm lub zog ntawm lub cev, lub viscosity ntawm cov kua yuav txo qis nrog qhov kub thiab txias, uas yog cov ntaub ntawv rau cov tshuaj cellulose ether. Txawm li cas los xij, raws li qhov kub thiab txias, thiab lub sijhawm sib cuag ntawm cov cement thiab dej nce, qhov ceev ntawm cov cement hydration yuav nrawm dua, thiab qib ntawm cov dej yuav nce ntxiv, yog li cov viscosity ntawm cov cement ntshiab.raws li plaster yuav nce ntxiv.

Hauv cellulose ether hloov cov cementraws li plaster, cellulose ether yuav adsorbed rau saum npoo ntawm cement hydration cov khoom, yog li inhibiting cement hydration, tab sis ntau hom thiab cov nqi ntawm cellulose ethers muaj peev xwm sib txawv los inhibit cement hydration, MC (xws li M1) muaj peev xwm tsis muaj zog los tiv thaiv cov cement hydration, thiab raws li qhov kub thiab txias, qhov hydration tus nqi ntawm cov cementraws li plaster tseem ceev dua, yog li qhov kub thiab txias, qhov viscosity feem ntau yog nce; HEC, HPMC thiab HEMC tuaj yeem cuam tshuam cov cement hydration, vim qhov kub nce, qhov dej ntawm cov cementraws li plaster qeeb qeeb, yog li qhov kub nce, HEC, HPMC thiab HEMC hloov cov cement Lub viscosity ntawmraws li plaster (0.6% polyash ratio) feem ntau yog txo, thiab vim hais tias lub peev xwm ntawm HEC kom ncua cov cement hydration yog ntau dua li ntawm HPMC thiab HEMC, qhov kev hloov ntawm cellulose ether nyob rau hauv kub hloov (20°C, 27°C thiab 35°C) Lub viscosity ntawm H1 hloov cov cementraws li plaster txo qhov feem ntau nrog qhov nce ntawm qhov kub thiab txias. Txawm li cas los xij, cement hydration tseem tshwm sim thaum qhov kub siab dua, yog li qhov txo qis ntawm cellulose ether hloov cov cement.raws li plaster nrog rau qhov nce ntawm qhov kub thiab txias yog tsis pom tseeb. Raws li E2 hloov kho cementraws li plaster muaj kev txhawj xeeb, thaum qhov ntau npaum li cas (cov hmoov tshauv piv yog 0.6%), cov nyhuv ntawm inhibiting cement hydration yog pom tseeb, thiab cov viscosity txo nrog qhov nce ntawm qhov kub thiab txias; Thaum qhov ntau npaum li cas tsawg (cov hmoov tshauv piv yog 0.3%), cov nyhuv ntawm inhibiting cement hydration tsis pom tseeb, thiab cov viscosity nce nrog qhov kub thiab txias.

3. Cov lus xaus

(1) Nrog kev nce ntxiv ntawm cellulose ether cov ntsiab lus, viscosity thiab viscosity nce tus nqi ntawm cov cementraws li plaster txuas ntxiv mus ntxiv. Molecular network qauv ntawm cellulose ether thiab lub network qauv ntawm cov cement hydration khoom yog intertwined, thiab thawj hydration ntawm xis mas indirectly tsub kom lub concentration ntawm cellulose ether, thiaj li hais tias cov viscosity ntawm cellulose ether tov thiab cement.raws li plaster muaj "composite superposition effect", uas yog, cellulose ether Lub viscosity ntawm cov cement hloovraws li plaster yog ntau ntau tshaj qhov sib npaug ntawm lawv cov viscosities. Piv nrog HPMC thiab HEMC hloov cov cement slurries, HEC hloov cov cement slurries muaj qis dua qhov ntsuas qhov tseem ceeb vim qhov kev loj hlob qeeb.

(2) Ob leeg cellulose ether hloov cov cementraws li plaster thiab ntshiab cementraws li plaster muaj cov cuab yeej ntawm shear thinning los yog pseudoplasticity; pseudoplasticity ntawm cellulose ether hloov cementraws li plaster yog qis dua li cov cement ntshiabraws li plaster; qhov qis dua qhov kev sib hloov, lossis cov cellulose Qhov qis dua qhov viscosity ntawm ether-modified cementraws li plaster, los yog qis dua cov ntsiab lus ntawm cellulose ether, qhov pom tseeb dua qhov pseudoplasticity ntawm cellulose ether-modified cementraws li plaster.

(3) Raws li qhov kub thiab txias ntxiv, qhov ceev thiab qib ntawm cov cement hydration nce, kom cov viscosity ntawm cov cement ntshiab.raws li plaster maj mam nce. Vim muaj ntau hom thiab ntau npaum li cas ntawm cellulose ethers muaj peev xwm sib txawv los tiv thaiv cov cement hydration, viscosity ntawm hloov cement paste txawv nrog kub.