Cellulose ethers, xws li methyl cellulose (MC) thiab hydroxypropyl methyl cellulose (HPMC), yog siv dav hauv cov khoom siv cement vim lawv cov dej tuav tau zoo, ua haujlwm tau zoo, thiab cov khoom adhesion. Txawm li cas los xij, kev ua haujlwm ntawm cellulose ethers hauv cov khoom cement tuaj yeem cuam tshuam los ntawm ntau yam, suav nrog hom thiab ntau npaum li cas ntawm cellulose ether, hom thiab ntau npaum li cas ntawm cov cement, kev kho mob, thiab ib puag ncig. Yog li ntawd, nws yog ib qho tseem ceeb kom tswj tau qhov kev ua tau zoo ntawm cellulose ethers hauv cov khoom cement kom ntseeg tau tias qhov zoo thiab kev ua tau zoo.

1. Kev xaiv ntawm Cellulose Ether Hom thiab Siv

Kev xaiv ntawm cellulose ether hom thiab ntau npaum li cas yog qhov tseem ceeb hauv kev tswj kev ua haujlwm ntawm cellulose ethers hauv cov khoom cement. Cov cellulose ethers sib txawv muaj cov khoom sib txawv, thiab kev xaiv ntawm hom cellulose ether tsim nyog nyob ntawm cov ntawv thov tshwj xeeb thiab kev ua haujlwm. Piv txwv li, HPMC feem ntau yog siv rau hauv cov nplais nplaum vim nws cov dej tuav tau zoo thiab cov khoom adhesion, thaum MC feem ntau siv rau hauv cov khoom siv thiab cov khib nyiab vim nws ua haujlwm tau zoo thiab cov khoom tuav dej.

Qhov ntau npaum ntawm cellulose ether kuj ua lub luag haujlwm tseem ceeb hauv kev tswj nws cov kev ua tau zoo hauv cov khoom siv cement. Qhov tsim nyog npaum li cas ntawm cellulose ether nyob ntawm ntau yam, nrog rau hom thiab ntau npaum li cas ntawm cov cement, qhov xav tau kev ua haujlwm thiab dej tuav, thiab ib puag ncig. Feem ntau, qhov ntau npaum li cas ntawm cellulose ether yog li ntawm 0.1% mus rau 2% los ntawm qhov hnyav ntawm cov cement, nyob ntawm cov ntawv thov tshwj xeeb thiab kev ua haujlwm.

2. Compatibility nrog Cement

Kev sib xyaw ntawm cellulose ether nrog cov cement yog qhov tseem ceeb hauv kev tswj nws cov kev ua tau zoo hauv cov khoom cement. Qhov sib ntxiv ntawm cellulose ether rau cement tuaj yeem cuam tshuam rau lub sijhawm teem, lub zog, thiab kev ua haujlwm ntawm cov cement, nyob ntawm seb hom thiab ntau npaum li cas ntawm cellulose ether thiab hom cement. Yog li ntawd, nws yog ib qho tseem ceeb los xyuas kom meej lub compatibility ntawm cellulose ether nrog xis mas los xyuas kom meej zoo zoo thiab kev ua tau zoo.

Kev sib raug zoo ntawm cellulose ether nrog cov cement tuaj yeem raug soj ntsuam los ntawm kev ntsuas kev sib raug zoo, xws li Vicat test, thawj zaug thiab qhov kawg ntawm lub sijhawm ntsuas, thiab kev ntsuas lub zog compressive. Cov txiaj ntsig ntawm cov kev ntsuam xyuas no tuaj yeem muab cov ntaub ntawv tseem ceeb ntawm kev ua haujlwm ntawm cellulose ether hauv cov khoom cement thiab tuaj yeem siv los ua kom zoo dua hom thiab ntau npaum li cas ntawm cellulose ether.

3. Kev Kho Mob

Kev kho mob ntawm cov khoom cement tuaj yeem cuam tshuam rau kev ua haujlwm ntawm cellulose ethers. Cov txheej txheem kho, suav nrog qhov ntsuas kub, av noo, thiab lub sijhawm kho, tuaj yeem cuam tshuam cov dej ntawm cov cement thiab kev ua haujlwm ntawm cellulose ethers. Qhov kev kho kom zoo tshaj plaws yog nyob ntawm daim ntawv thov tshwj xeeb thiab kev ua tau zoo.

Piv txwv li, nyob rau hauv cov nplais nplaum, qhov kev kho kom zoo yog feem ntau nyob rau hauv chav tsev kub nrog cov av qis thiab lub sijhawm kho ntawm 24 mus rau 48 teev. Nyob rau hauv renders thiab mortars, qhov zoo curing tej yam kev mob tej zaum yuav txawv nyob ntawm seb cov kev thov tshwj xeeb, tab sis feem ntau muaj xws li kub siab thiab ntev curing lub sij hawm.

4. Ib puag ncig tej yam kev mob

Cov xwm txheej ib puag ncig, xws li kub, av noo, thiab raug tshuaj lom neeg lossis cov pa phem, tuaj yeem cuam tshuam kev ua haujlwm ntawm cellulose ethers hauv cov khoom cement. Piv txwv li, raug rau qhov kub thiab txias los yog cov av qis tuaj yeem cuam tshuam cov dej tuav cov khoom ntawm cellulose ethers, ua rau txo qis kev ua haujlwm thiab adhesion. Kev cuam tshuam rau cov tshuaj lom neeg los yog cov pa phem tuaj yeem cuam tshuam rau kev ua haujlwm ntawm cellulose ethers, ua rau txo lub zog los yog kav ntev.

Yog li ntawd, nws yog ib qho tseem ceeb los xav txog tej yam kev mob nyob rau hauv lub sij hawm ntawm daim ntawv thov thiab siv cellulose ethers nyob rau hauv cov khoom cement. Kev cia thiab tuav cov cellulose ethers tuaj yeem pab tswj lawv cov kev ua tau zoo thiab ua kom zoo ib yam.

Hauv kev xaus, kev tswj kom zoo ntawm kev ua haujlwm ntawm cellulose ethers hauv cov khoom cement yuav tsum tau ua tib zoo xav txog ntau yam, nrog rau hom thiab ntau npaum li cas ntawm cellulose ether, kev sib raug zoo nrog cov cement, curing tej yam kev mob, thiab tej yam kev mob. Los ntawm kev ua kom zoo rau cov xwm txheej no, nws muaj peev xwm ua tiav qhov zoo ib yam thiab kev ua tau zoo ntawm cellulose ethers hauv cov khoom cement, ua rau kev txhim kho kev ua haujlwm, dej tuav, thiab adhesion zog.