Nonionic cellulose ether hauv polymer cement

Raws li ib qho tseem ceeb additive nyob rau hauv polymer cement, nonionic cellulose ether tau txais kev saib xyuas thiab kev tshawb fawb. Raws li cov ntaub ntawv tseem ceeb hauv tsev thiab txawv teb chaws, txoj cai lij choj thiab cov txheej txheem ntawm non-ionic cellulose ether hloov cov cement mortar tau tham los ntawm cov yam ntxwv ntawm cov hom thiab kev xaiv ntawm non-ionic cellulose ether, nws cov nyhuv ntawm lub cev ntawm polymer cement, nws cov nyhuv ntawm micromorphology thiab mechanical zog, thiab cov shortcomings ntawm kev tshawb fawb tam sim no tau muab tso rau pem hauv ntej. Txoj haujlwm no yuav txhawb nqa kev siv cellulose ether hauv polymer cement.

Cov lus tseem ceeb: nonionic cellulose ether, polymer cement, lub cev muaj zog, mechanical zog, microstructure

1. Txheej txheem cej luam

Nrog rau qhov kev thov nce ntxiv thiab kev ua tau zoo ntawm polymer cement hauv kev tsim kho kev lag luam, ntxiv cov khoom ntxiv rau nws qhov kev hloov kho tau dhau los ua qhov kev tshawb fawb hotspot, ntawm cov uas, cellulose ether tau siv dav vim nws cov nyhuv ntawm cov cement mortar dej tuav, thickening, retarding, huab cua. thiab lwm yam. Nyob rau hauv daim ntawv no, hom cellulose ether, cov teebmeem ntawm lub cev thiab txhua yam khoom ntawm polymer cement thiab micromorphology ntawm polymer cement tau piav qhia, uas muab cov lus qhia theoretical rau kev siv cellulose ether hauv polymer cement.

2. Hom nonionic cellulose ether

Cellulose ether yog ib hom polymer compound nrog ether qauv tsim los ntawm cellulose. Muaj ntau ntau hom cellulose ether, uas muaj kev cuam tshuam zoo ntawm cov khoom siv cement-based thiab nyuaj rau xaiv. Raws li cov qauv tshuaj ntawm cov khoom hloov pauv, lawv tuaj yeem muab faib ua anionic, cationic thiab nonionic ethers. Nonionic cellulose ether nrog sab saw hloov ntawm H, cH3, c2H5, (cH2cH20)nH, [cH2cH(cH3)0]nH thiab lwm pab pawg uas tsis yog-dissociable yog cov feem ntau siv nyob rau hauv cov cement, feem ntau cov neeg sawv cev yog methyl cellulose ether, hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether, hydroxyethyl cellulose ether thiab lwm yam. Ntau hom cellulose ethers muaj qhov sib txawv ntawm lub sijhawm teeb tsa ntawm cov cement. Raws li cov ntaub ntawv sau tseg dhau los, HEC muaj qhov muaj peev xwm rov qab tau zoo tshaj plaws rau cov cement, ua raws li HPMc thiab HEMc, thiab Mc muaj qhov phem tshaj. Rau tib hom cellulose ether, molecular hnyav lossis viscosity, methyl, hydroxyethyl, hydroxypropyl cov ntsiab lus ntawm cov pab pawg no txawv, nws cov nyhuv retarding kuj txawv. Feem ntau hais lus, qhov ntau dua qhov viscosity thiab siab dua cov ntsiab lus ntawm cov pab pawg tsis sib xws, qhov ua rau muaj peev xwm qeeb. Yog li, nyob rau hauv cov txheej txheem tsim khoom tiag tiag, raws li qhov yuav tsum tau ua ntawm kev lag luam mortar coagulation, cov pab pawg tsim nyog cov ntsiab lus ntawm cellulose ether tuaj yeem xaiv. Los yog hauv kev tsim cov cellulose ether tib lub sijhawm, kho cov ntsiab lus ntawm cov pab pawg ua haujlwm, ua kom nws ua tau raws li qhov yuav tsum tau muaj ntawm cov mortar sib txawv.

3,Kev cuam tshuam ntawm nonionic cellulose ether ntawm lub cev khoom ntawm polymer cement

3.1 Slow coagulation

Txhawm rau ua kom lub sijhawm hydration hardening ntawm cov cement, kom cov mortar tshiab sib tov nyob rau hauv lub sij hawm ntev kom nyob twj ywm yas, thiaj li mus kho lub sij hawm teem ntawm cov tshiab sib tov mortar, txhim kho nws operability, feem ntau ntxiv retarder nyob rau hauv mortar, tsis- ionic cellulose ether yog haum rau polymer cement yog ib qho retarder.

Cov nyhuv retarding ntawm nonionic cellulose ether ntawm cov cement feem ntau cuam tshuam los ntawm nws tus kheej hom, viscosity, ntau npaum li cas, sib txawv ntawm cov cement minerals thiab lwm yam. Pourchez J et al. qhia tau hais tias qhov siab dua qib ntawm cellulose ether methylation, qhov ua rau muaj kev cuam tshuam tsis zoo, thaum lub cev hnyav molecular ntawm cellulose ether thiab hydroxypropoxy cov ntsiab lus muaj qhov tsis muaj zog ntawm cov cement hydration retarding. Nrog rau qhov nce ntawm viscosity thiab doping tus nqi ntawm non-ionic cellulose ether, txheej adsorption ntawm cov cement hais yog thickened, thiab lub sij hawm pib thiab zaum kawg ntawm cov cement txuas ntxiv, thiab cov nyhuv retarding yog pom tseeb dua. Cov kev tshawb fawb tau pom tias thaum ntxov tso tawm ntawm cov cement slurries nrog cov ntsiab lus HEMC sib txawv yog li 15% qis dua li cov cement slurries, tab sis tsis muaj qhov sib txawv tseem ceeb hauv cov txheej txheem dej tom qab. Singh NK et al. pom tau hais tias nrog qhov nce ntawm HEc doping tus nqi, hydration tshav kub tso tawm ntawm hloov cement mortar pom ib tug qauv ntawm thawj zaug nce thiab tom qab ntawd txo qis, thiab cov ntsiab lus HEC thaum ncav cuag qhov siab tshaj plaws hydration thaum tshav kub kub tso tawm muaj feem xyuam rau lub hnub nyoog kho.

Tsis tas li ntawd, nws tau pom tias cov nyhuv retarding ntawm nonionic cellulose ether yog ze ze rau cov muaj pes tsawg leeg ntawm cov cement. Peschard et al. pom tias qhov qis dua cov ntsiab lus ntawm tricalcium aluminate (C3A) hauv cov cement, qhov pom tseeb dua cov nyhuv retarding ntawm cellulose ether. schmitz L et al. ntseeg tias qhov no yog tshwm sim los ntawm ntau txoj hauv kev ntawm cellulose ether rau hydration kinetics ntawm tricalcium silicate (C3S) thiab tricalcium aluminate (C3A). Cellulose ether tuaj yeem txo cov tshuaj tiv thaiv nyob rau lub sijhawm nrawm ntawm C3S, thaum rau C3A, nws tuaj yeem ua rau lub sijhawm induction, thiab thaum kawg ncua cov txheej txheem solidification thiab hardening ntawm mortar.

Muaj cov kev xav sib txawv ntawm cov txheej txheem ntawm non-ionic cellulose ether ncua cov cement hydration. Silva et al. Liu ntseeg hais tias qhov kev taw qhia ntawm cellulose ether yuav ua rau lub viscosity ntawm pore tov nce, yog li thaiv kev txav ntawm ions thiab ncua lub condensation. Txawm li cas los xij, Pourchez et al. ntseeg tias muaj kev sib raug zoo ntawm kev ncua ntawm cellulose ether rau cement hydration thiab viscosity ntawm cement slurry. Lwm txoj kev xav yog tias cov nyhuv retarding ntawm cellulose ether yog ze ze rau alkali degradation. Polysaccharides zoo li degrade yooj yim los tsim hydroxyl carboxylic acid uas tuaj yeem ncua cov dej ntawm cov cement nyob rau hauv cov xwm txheej alkaline. Txawm li cas los xij, cov kev tshawb fawb tau pom tias cellulose ether yog qhov ruaj khov nyob rau hauv alkaline tej yam kev mob thiab tsuas yog degrades me ntsis, thiab qhov degradation muaj me ntsis cuam tshuam rau kev ncua ntawm cement hydration. Tam sim no, qhov pom zoo sib xws yog tias cov nyhuv retarding feem ntau tshwm sim los ntawm adsorption. Tshwj xeeb, pawg hydroxyl nyob rau hauv molecular nto ntawm cellulose ether yog acidic, lub ca (0H) nyob rau hauv lub hydration cement system, thiab lwm yam ntxhia theem yog alkaline. Raws li kev sib koom ua ke ntawm hydrogen bonding, complexing thiab hydrophobic, acidic cellulose ether molecules yuav adsorbed rau saum npoo ntawm alkaline cement hais thiab hydration khoom. Tsis tas li ntawd, ib zaj duab xis nyias yog tsim rau ntawm nws qhov chaw, uas cuam tshuam qhov kev loj hlob ntxiv ntawm cov pob zeb hauv av theem siv lead ua nuclei thiab ncua cov dej thiab qhov chaw ntawm cov cement. Qhov muaj zog dua qhov muaj peev xwm adsorption ntawm cov khoom siv cement hydration thiab cellulose ether, qhov pom tseeb dua qhov dej ncua ntawm cov cement. Ntawm ib sab, qhov loj ntawm steric hindrance plays lub luag hauj lwm txiav txim siab nyob rau hauv adsorption muaj peev xwm, xws li me me steric hindrance ntawm hydroxyl pawg, nws muaj zog acidity, adsorption kuj muaj zog. Ntawm qhov tod tes, lub peev xwm adsorption kuj nyob ntawm qhov muaj pes tsawg leeg ntawm cov khoom siv dej ntawm cov cement. Pourchez et al. pom tias cellulose ether tau yooj yim adsorbed rau saum npoo ntawm hydration khoom xws li ca(0H)2, csH gel thiab calcium aluminate hydrate, tab sis nws tsis yooj yim rau adsorbed los ntawm ettringite thiab unhydrated theem. Mullert txoj kev tshawb fawb kuj tau qhia tias cellulose ether muaj qhov muaj zog adsorption ntawm c3s thiab nws cov khoom hydration, yog li cov dej ntawm silicate theem tau qeeb qeeb. Lub adsorption ntawm ettringite yog tsawg, tab sis qhov tsim ntawm ettringite tau qeeb qeeb. Qhov no yog vim qhov qeeb hauv kev tsim ntawm ettringite tau cuam tshuam los ntawm ca2 + sib npaug hauv kev daws, uas yog qhov txuas ntxiv ntawm kev ncua ntawm cellulose ether hauv silicate hydration.

3.2 Kev txuag dej

Lwm qhov kev hloov pauv tseem ceeb ntawm cov cellulose ether hauv cov cement mortar yog tshwm sim los ntawm cov dej tuav, uas tuaj yeem tiv thaiv cov dej hauv cov khib nyiab ntub dej los ntawm evaporating ntxov ntxov los yog absorbed los ntawm lub hauv paus, thiab ncua lub hydration ntawm cement thaum ncua sij hawm ua hauj lwm ntawm ntub mortar, thiaj li yuav xyuas kom meej tias nyias mortar yuav combed, plastered mortar yuav kis tau, thiab yooj yim rau nqus mortar tsis tas yuav tsum tau pre-ntub.

Lub peev xwm tuav dej ntawm cellulose ether yog ze rau nws cov viscosity, ntau npaum li cas, hom thiab ambient kub. Lwm yam kev mob zoo ib yam, qhov ntau dua qhov viscosity ntawm cellulose ether, qhov zoo dua cov dej tuav cov nyhuv, ib qho me me ntawm cellulose ether tuaj yeem ua rau cov dej tuav cov tshuaj khib nyiab zoo heev; Rau tib lub cellulose ether, qhov ntau dua qhov ntxiv, qhov siab dua cov dej tuav tus nqi ntawm cov mortar hloov kho, tab sis muaj ib qho txiaj ntsig zoo, tshaj qhov uas cov dej tuav tau nce qeeb. Rau ntau hom cellulose ether, kuj tseem muaj qhov sib txawv ntawm cov dej tuav, xws li HPMc nyob rau hauv tib yam li Mc zoo tuav dej. Tsis tas li ntawd, cov dej tuav kev ua haujlwm ntawm cellulose ether txo qis nrog qhov nce ntawm qhov kub thiab txias.

Nws feem ntau ntseeg tias yog vim li cas vim li cas cellulose ether muaj lub luag haujlwm ntawm kev tuav dej yog feem ntau yog vim 0H ntawm cov molecule thiab 0 atom ntawm ether daim ntawv cog lus yuav cuam tshuam nrog dej molecules los ua ke hydrogen daim ntawv cog lus, kom cov dej dawb yuav khi. dej, thiaj li ua si lub luag hauj lwm zoo ntawm dej tuav; Nws tseem ntseeg tau hais tias cov cellulose ether macromolecular saw plays lub luag haujlwm txwv hauv kev nthuav tawm ntawm cov dej molecules, thiaj li tswj tau cov dej evaporation zoo, kom ua tiav cov dej tuav; Pourchez J tau sib cav tias cellulose ether ua tiav cov dej tuav cov nyhuv los ntawm kev txhim kho cov khoom rheological ntawm cov cement slurry tshiab, cov qauv ntawm cov porous network thiab tsim cov cellulose ether zaj duab xis uas cuam tshuam cov dej ntws. Laetitia P et al. kuj ntseeg hais tias cov cuab yeej rheological ntawm mortar yog ib qho tseem ceeb, tab sis kuj ntseeg tias viscosity tsis yog qhov tsuas yog txiav txim siab cov dej tuav tau zoo ntawm mortar. Nws yog ib qho tsim nyog sau cia tias txawm hais tias cellulose ether muaj cov dej tuav tau zoo, tab sis nws cov kev hloov kho hardened cement mortar dej nqus yuav raug txo, yog vim li cas cellulose ether nyob rau hauv mortar zaj duab xis, thiab nyob rau hauv mortar ib tug loj tus naj npawb ntawm me me kaw pores, thaiv. mortar nyob rau hauv lub capillary.

3.3 Thickening

Qhov sib xws ntawm mortar yog ib qho tseem ceeb indexes los ntsuas nws kev ua haujlwm. Cellulose ether feem ntau yog siv los ua kom qhov sib xws. "Consistency" sawv cev rau lub peev xwm ntawm cov khoom sib xyaw tshiab kom ntws thiab deform nyob rau hauv qhov kev txiav txim ntawm lub ntiajteb txawj nqus los yog sab nraud rog. Ob lub zog ntawm thickening thiab dej tuav ntxiv ib leeg. Ntxiv rau qhov tsim nyog ntawm cellulose ether tuaj yeem tsis tsuas yog txhim kho cov dej tuav kev ua haujlwm ntawm mortar, xyuas kom meej kev tsim kho, tab sis kuj ua rau kom muaj qhov sib xws ntawm mortar, ua kom muaj peev xwm tiv thaiv kev tawg ntawm cov cement, txhim kho kev sib raug zoo ntawm mortar thiab matrix, thiab txo qhov sagging tshwm sim ntawm mortar.

Cov nyhuv thickening ntawm cellulose ether feem ntau yog los ntawm nws tus kheej viscosity, qhov ntau dua viscosity, qhov zoo dua cov nyhuv thickening, tab sis yog tias cov viscosity loj dhau, nws yuav txo qhov fluidity ntawm mortar, cuam tshuam rau kev tsim kho. Cov yam ntxwv uas cuam tshuam rau viscosity hloov, xws li qhov hnyav molecular (los yog qib ntawm polymerization) thiab concentration ntawm cellulose ether, tshuaj kub, shear npaum li cas, yuav cuam tshuam rau qhov kawg thickening nyhuv.

Lub thickening mechanism ntawm cellulose ether feem ntau yog los ntawm hydration thiab entanglement ntawm molecules. Ntawm ib sab, cov saw hlau polymer ntawm cellulose ether yog ib qho yooj yim los tsim hydrogen daim ntawv cog lus nrog dej hauv dej, hydrogen daim ntawv cog lus ua rau nws muaj dej ntau; Ntawm qhov tod tes, thaum cellulose ether ntxiv rau hauv mortar, nws yuav nqus dej ntau, kom nws lub ntim tau nthuav dav heev, txo qhov chaw dawb ntawm cov khoom, tib lub sijhawm cellulose ether molecular chains intertwine nrog ib leeg. los tsim cov qauv peb-dimensional network, mortar hais yog nyob ib puag ncig uas, tsis pub dawb. Hauv lwm lo lus, nyob rau hauv ob qho kev ua no, viscosity ntawm lub kaw lus tau txhim kho, yog li ua tiav cov txiaj ntsig xav tau thickening.

4. Cov nyhuv ntawm nonionic cellulose ether ntawm morphology thiab pore qauv ntawm polymer cement

Raws li tau pom los ntawm cov saum toj no, non-ionic cellulose ether plays lub luag haujlwm tseem ceeb hauv polymer cement, thiab nws qhov ntxiv yuav cuam tshuam rau microstructure ntawm tag nrho cov cement mortar. Cov txiaj ntsig tau pom tias tsis yog-ionic cellulose ether feem ntau ua rau cov porosity ntawm cov cement mortar, thiab cov pores hauv qhov loj ntawm 3nm ~ 350um nce, cov uas cov pores nyob rau hauv thaj tsam ntawm 100nm ~ 500nm nce ntau tshaj. Kev cuam tshuam ntawm cov qauv pore ntawm cov cement mortar yog ze ze rau hom thiab viscosity ntawm non-ionic cellulose ether ntxiv. Ou Zhihua et al. ntseeg tias thaum lub viscosity zoo ib yam, lub porosity ntawm cement mortar hloov los ntawm HEC yog me dua li ntawm HPMc thiab Mc ntxiv raws li kev hloov kho. Rau tib lub cellulose ether, qhov me dua qhov viscosity, qhov me dua qhov porosity ntawm hloov cement mortar. Los ntawm kev kawm txog cov nyhuv ntawm HPMc ntawm lub aperture ntawm foamed cement rwb thaiv tsev board, Wang Yanru li al. pom tias qhov sib ntxiv ntawm HPMC tsis hloov pauv qhov porosity, tab sis tuaj yeem txo qhov aperture. Txawm li cas los xij, Zhang Guodian et al. pom tias qhov ntau dua cov ntsiab lus HEMc, qhov pom tseeb dua qhov cuam tshuam ntawm cov qauv pore ntawm cov cement slurry. Qhov sib ntxiv ntawm HEMc tuaj yeem ua rau muaj qhov porosity, tag nrho cov pore ntim thiab qhov nruab nrab pore vojvoog ntawm cov cement slurry, tab sis qhov tshwj xeeb ntawm qhov pore txo qis, thiab cov capillary pores loj dua 50nm hauv txoj kab uas hla yuav nce ntxiv, thiab cov pores tau qhia. feem ntau yog kaw pores.

Cov nyhuv ntawm nonionic cellulose ether ntawm kev tsim cov cement slurry pore qauv tau soj ntsuam. Nws tau pom tias qhov sib ntxiv ntawm cellulose ether feem ntau hloov cov khoom ntawm cov kua theem. Ntawm qhov tod tes, cov kua theem ntawm qhov nro txo ​​qis, ua rau nws yooj yim rau cov npuas hauv cov cement mortar, thiab yuav ua rau cov kua theem qis thiab cov npuas diffusion, yog li cov npuas me me nyuaj rau sib sau ua npuas loj thiab tawm, yog li cov voidage yog loj heev; Ntawm qhov tod tes, cov viscosity ntawm cov kua theem nce, uas tseem inhibits cov kua dej, npuas diffusion thiab npuas merger, thiab txhim khu lub peev xwm kom stabilize npuas. Yog li ntawd, qhov kev cuam tshuam ntawm cellulose ether ntawm qhov pore loj faib ntawm cov cement mortar tuaj yeem tau txais: nyob rau hauv qhov pore loj ntawm ntau tshaj 100nm, npuas tuaj yeem qhia los ntawm kev txo qhov nro ntawm cov kua theem, thiab npuas diffusion tuaj yeem cuam tshuam los ntawm nce cov kua viscosity; nyob rau hauv cheeb tsam ntawm 30nm ~ 60nm, tus naj npawb ntawm pores nyob rau hauv cheeb tsam tuaj yeem cuam tshuam los ntawm inhibiting kev sib koom ua ke ntawm cov npuas me.

5. Kev cuam tshuam ntawm nonionic cellulose ether rau txhua yam khoom ntawm polymer cement

Cov khoom siv ntawm polymer cement yog ze ze rau nws cov morphology. Nrog rau qhov sib ntxiv ntawm nonionic cellulose ether, lub porosity nce, uas yog khi ua rau muaj kev cuam tshuam tsis zoo rau nws lub zog, tshwj xeeb tshaj yog lub zog compressive thiab flexural zog. Qhov txo qis ntawm compressive lub zog ntawm cov cement mortar yog qhov ntau dua li lub zog flexural. Ou Zhihua et al. tau kawm txog kev cuam tshuam ntawm ntau hom non-ionic cellulose ether ntawm cov khoom siv ntawm cov cement mortar, thiab pom tias lub zog ntawm cellulose ether hloov cov cement mortar yog qis dua li cov cement mortar, thiab qis tshaj 28d compressive zog tsuas yog 44.3%. ntawm cov ntshiab cement slurry. Lub zog compressive thiab flexural zog ntawm HPMc, HEMC thiab MC cellulose ether hloov yog zoo sib xws, thaum lub zog compressive thiab flexural zog ntawm HEc hloov cement slurry nyob rau hauv txhua lub hnub nyoog yog ntau dua. Qhov no muaj feem xyuam nrog lawv cov viscosity lossis molecular hnyav, qhov siab dua qhov viscosity lossis molecular hnyav ntawm cellulose ether, lossis ntau dua qhov kev ua haujlwm saum npoo, qhov qis dua lub zog ntawm nws cov cement mortar.

Txawm li cas los xij, nws kuj tau pom tias cov nonionic cellulose ether tuaj yeem txhim kho lub zog tensile, yooj thiab cohesibility ntawm cement mortar. Huang Liang et al. pom tias, tsis zoo li kev hloov pauv txoj cai ntawm compressive lub zog, lub zog shear thiab tensile lub zog ntawm slurry nce nrog nce ntawm cov ntsiab lus ntawm cellulose ether hauv cov cement mortar. Kev soj ntsuam ntawm yog vim li cas, tom qab sib ntxiv ntawm cellulose ether, thiab polymer emulsion ua ke los tsim ib tug loj tus naj npawb ntawm ntom polymer zaj duab xis, zoo heev txhim kho qhov yooj ntawm slurry, thiab cement hydration khoom, unhydrated cement, fillers thiab lwm yam ntaub ntawv sau nyob rau hauv zaj duab xis no. , los xyuas kom meej lub zog tensile ntawm txheej txheej.

Txhawm rau txhim kho kev ua haujlwm ntawm cov tsis-ionic cellulose ether hloov polymer cement, txhim kho lub cev ntawm cov cement mortar tib lub sijhawm, tsis txo nws cov khoom siv dag zog, kev xyaum ib txwm yog kom phim cellulose ether thiab lwm yam khoom siv ntxiv, ntxiv rau. cov cement mortar. Li Tao-Wen et al. pom tias cov khoom sib xyaw ua ke muaj li ntawm cellulose ether thiab polymer kua nplaum hmoov tsis tsuas yog txhim kho me ntsis kev khoov lub zog thiab compressive lub zog ntawm mortar, kom lub cohesiveness thiab viscosity ntawm cement mortar yog tsim nyog rau txheej txheej, tab sis kuj tseem txhim kho cov dej tuav. muaj peev xwm ntawm mortar piv nrog ib leeg cellulose ether. Xu Qi et al. ntxiv slag hmoov, dej txo tus neeg saib xyuas thiab HEMc, thiab pom tias cov dej txo tus neeg sawv cev thiab cov hmoov ntxhia tuaj yeem ua rau kom qhov ntom ntom ntawm mortar, txo qhov muaj pes tsawg leeg, txhawm rau txhim kho lub zog thiab elastic modulus ntawm mortar. HEMc tuaj yeem ua rau lub zog tensile zog ntawm mortar, tab sis nws tsis zoo rau lub zog compressive thiab elastic modulus ntawm mortar. Yang Xiaojie et al. pom tias cov yas shrinkage tawg ntawm cov cement mortar tuaj yeem txo qis tom qab sib xyaw HEMc thiab PP fiber ntau.

6. Cov lus xaus

Noionic cellulose ether plays lub luag haujlwm tseem ceeb hauv polymer cement, uas tuaj yeem txhim kho lub cev zoo (xws li kev tiv thaiv coagulation, dej tuav, thickening), microscopic morphology thiab txhua yam khoom ntawm cement mortar. Ntau txoj haujlwm tau ua tiav ntawm kev hloov kho cov ntaub ntawv cement-based los ntawm cellulose ether, tab sis tseem muaj qee qhov teeb meem uas yuav tsum tau kawm ntxiv. Piv txwv li, nyob rau hauv kev siv engineering siv, me ntsis kev mloog yog them rau lub rheology, deformation zog, ntim stability thiab durability ntawm modified cement-raws li cov ntaub ntawv, thiab ib tug tsis tu ncua kev sib raug zoo tsis tau tsim nrog ntxiv cellulose ether. Kev tshawb fawb txog kev tsiv teb tsaws chaw ntawm cellulose ether polymer thiab cement hydration cov khoom hauv cov tshuaj tiv thaiv hydration tseem tsis txaus. Cov txheej txheem kev txiav txim thiab cov txheej txheem ntawm cov khoom sib xyaw ua ke ntawm cov cellulose ether thiab lwm cov khoom sib xyaw tsis meej txaus. Kev sib xyaw ntxiv ntawm cellulose ether thiab inorganic cov khoom siv ntxiv xws li iav fiber ntau tsis tau ua tiav. Tag nrho cov no yuav yog lub hom phiaj ntawm kev tshawb fawb yav tom ntej los muab kev qhia theoretical rau kev txhim kho kev ua haujlwm ntawm polymer cement.