Qhov cuam tshuam ntawm HPMC thiab CMC ntawm kev ua haujlwm ntawm cov pob zeb ua

HydroxyPropyyl methylulose (HPMC) thiab Carboxymethyl cellulose (CMC) yog ob qho tib si uas muaj kev pab hauv cov qauv sib ntxiv hauv cov pob khoom. Lawv pab ntau lub hom phiaj thiab tuaj yeem muaj cov tseem ceeb ntawm kev ua tau. Nov yog qhov cuam tshuam ntawm HPMC thiab CMC ntawm pob zeb ua vaj tse:

1. Dej khaws cia: Ob HPMC thiab CMC yog cov dej ua haujlwm zoo. Lawv txhim kho kev ua haujlwm thiab muaj txiaj ntsig ntawm cov qhob noom tshiab los ntawm kev ncua dej evaporation thaum lub rooj thiab kho. Qhov kev tuav dej ntev no yuav pab kom cov kev lim hiam tsim nyog ntawm cov pajas, txhawb kev ua kom muaj zog ntawm shrinkage tawg.
2. Kev ua haujlwm: HPMC thiab CMC ua li rheology modifiers, txhim kho lub workpility thiab flowability ntawm pob zeb sib xyaw. Lawv txhim kho cohesiveness thiab lubricity ntawm cov sib tov, ua rau nws yooj yim rau qhov chaw, sib sau ua ke, thiab ua tiav. Qhov kev ua haujlwm no ua haujlwm pab kom cov kab ke zoo dua thiab txo qhov kev voids los yog honeycombing nyob rau hauv lub hardened qhob.
3. Adhesion: HPMC thiab CMC txhim kho cov nplaum ntawm cov pob zeb ua kom muaj ntau lub substrates, suav nrog cov neeg sib xyaw, thiab cov chaw formwork. Lawv txhim kho txoj hlua khi khi ntawm cov khoom noj kom xis thiab sib xyaw, txo qhov kev pheej hmoo ntawm delamination los yog debonding. Qhov kev nce qib no muaj txiaj ntsig rau tag nrho cov qauv ua haujlwm ntawm cov qhob.
4. Cua Entrainment: HPMC thiab CMC tuaj yeem ua raws li huab cua-entraining cov neeg sawv cev thaum siv hauv pob zeb sib tov. Lawv pab qhia txog cov pa hluav taws xob me me rau hauv cov sib tov, uas txhim kho kom khov-thaws tsis kam thiab kav ntev los ntawm kev hloov pauv los ntawm kev hloov pauv hloov pauv. Kev siv cua kom zoo tuaj yeem tiv thaiv kev puas tsuaj los ntawm Frost weav thiab scring hauv huab cua txias.
5. Lub sijhawm teeb tsa: HPMC thiab CMC muaj peev xwm cuam tshuam rau lub sijhawm teeb tsa lub sijhawm ntawm pob zeb sib xyaw. Los ntawm kev ncua cov tshuaj tiv thaiv kev haus dej ntawm cov cement, lawv tuaj yeem txuas ntxiv thaum lub sijhawm pib thiab zaum kawg, muab sijhawm ntau rau kev tso, kev sib sau, thiab ua tiav. Txawm li cas los xij, ntau dhau ntawm ntau ntau yam lossis cov yeeb yam tshwj xeeb tuaj yeem ua rau lub sijhawm ncua sij hawm, yuav tsum ua tib zoo hloov kho kom tau raws li phiaj xwm.
6. Tawg kuj: HPMC thiab CMC pab txhawb rau qhov tawg tsis kam ntawm hardened qhob los ntawm txhim kho nws cohesion, ductility, thiab kev nruj. Lawv pab txo cov kev tsim ntawm shrinkage tawg thiab txo cov kev tshaj tawm ntawm cov kab nrib pleb uas twb muaj lawm, tshwj xeeb hauv ib puag ncig kev txwv lossis ib puag ncig. Qhov kev txhim kho no nthuav tawm kev tawm tsam txhim kho cov sijhawm ntev ntev thiab kev ua tau ntawm cov pob zeb ua vaj tse.
7. Kev sib txuam: HPMC thiab CMC tau tshaj tawm ntau yam ntawm cov pob zeb ua admixtures thiab ntxiv, tso cai rau ntau yam kev tsim cov qauv. Lawv tuaj yeem siv tau ua ke nrog lwm tus neeg yawg, cov khoom siv kom nrawm dua, thiab cov khoom siv dawb ceev, thiab cov hom phiaj kev ua tau zoo thaum ua tiav kev sib haum xeeb thiab kev ruaj ntseg.

HPMC thiab CMC ua cov phiaj xwm tseem ceeb hauv kev txhim kho kev ua haujlwm los ntawm kev txhim kho dej ua ke, kev ua haujlwm huab cua, teeb tsa lub sijhawm, tawg. Lawv cov khoom siv ntau yam ua rau lawv muaj txiaj ntsig zoo ntxiv rau kev txhim kho cov pob zeb ua kom sib xyaw thiab ua tiav cov yam ntxwv xav tau hauv ntau yam kev kho.