Hydroxypropyl Methylcellulose (HPMC)yog ib qho tseem ceeb ntawm cellulose ether compound siv dav hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv cov cement-based mortars, gypsum-based cov ntaub ntawv thiab txheej. HPMC plays lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom ntawm mortar, nrog rau kev txhim kho nws cov dej tsis zoo.
1. Txhim kho cov dej tuav ntawm mortar
Ib qho tseem ceeb tshaj plaws ntawm HPMC yog nws lub peev xwm khaws dej zoo heev. Ntxiv HPMC rau mortar tuaj yeem txo tus nqi ntawm cov dej poob hauv mortar. Kev ua haujlwm tshwj xeeb yog:
Txuas lub sijhawm cov cement hydration cov tshuaj tiv thaiv: HPMC tuaj yeem tswj cov av noo tsim nyog hauv cov mortar thiab xyuas kom meej tias cov cement particles ua rau muaj dej los tsim cov khoom hydration.
Tiv thaiv kev tsim cov kab nrib pleb: Kev poob dej nrawm tuaj yeem ua rau cov tshuaj khib nyiab kom qis thiab pib microcracks, yog li txo cov dej tsis zoo.HPMCtuaj yeem txo qis tus nqi ntawm cov dej poob thiab txo cov kab nrib pleb uas tshwm sim los ntawm qhuav shrinkage.
Kev txhim kho hauv dej tuav kev ua tau zoo ua rau cov qauv sab hauv ntawm cov mortar denser, txo cov porosity, thiab txhim kho cov impermeability ntawm mortar, yog li txhim kho nws cov dej tsis zoo.
2. Txhim kho kev ua haujlwm ntawm mortar
Cov yam ntxwv viscosity ntawm HPMC txhim kho cov khoom rheological ntawm mortar, yog li txhim kho nws txoj haujlwm:
Txo los ntshav: HPMC tuaj yeem faib cov dej sib npaug, tso cai rau cov dej faib kom ruaj khov rau hauv mortar thiab txo qhov pores los ntawm kev sib cais dej.
Txhim kho qhov adhesion ntawm mortar: HPMC txhim kho lub zog sib txuas ntawm cov mortar thiab cov khoom siv hauv paus, tso cai rau cov mortar los npog qhov chaw ntawm cov khoom siv hauv qab kom zoo dua, yog li txo qhov muaj peev xwm ntawm noo noo nkag los ntawm qhov sib txawv ntawm cov khoom siv hauv paus thiab cov tshuaj khib. .
Kev txhim kho ntawm kev tsim kho zoo ncaj qha cuam tshuam rau cov dej tsis zoo ntawm cov tshuaj khib nyiab. Ib txheej txheej thiab tuab mortar npog txheej tuaj yeem tiv thaiv kom tsis txhob ya raws.
3. Ua ib zaj duab xis tiv thaiv nto
HPMC muaj cov khoom siv ua yeeb yaj kiab thiab tuaj yeem tsim cov yeeb yaj kiab nyias thiab tuab thiab siv cov yeeb yaj kiab ntawm lub cug tshuaj khib:
Txo cov evaporation tus nqi ntawm cov dej: Tom qab kev tsim kho tiav, HPMC yuav tsim ib zaj duab xis tiv thaiv ntawm lub mortar kom txo tau qhov nqus ntawm noo noo nyob rau hauv lub mortar los ntawm sab nraud ib puag ncig.
Thaiv noo noo nkag mus rau: HPMC txheej tom qab tsim zaj duab xis muaj ib tug tej yam degree ntawm waterproofness thiab yuav siv tau raws li ib tug barrier los tiv thaiv sab nraud ya raws los ntawm kev nkag mus rau sab hauv ntawm lub mortar.
Qhov kev tiv thaiv saum npoo no muab kev tiv thaiv ntxiv rau cov khoom tsis zoo ntawm cov tshuaj khib nyiab.
4. Txo qhov porosity ntawm mortar
HPMC tuaj yeem txhim kho microstructure ntawm mortar zoo. Nws mechanism ntawm kev txiav txim yog raws li nram no:
Filling effect: HPMC molecules tuaj yeem nkag mus rau hauv cov qauv microporous hauv mortar thiab ib nrab sau cov pores, yog li txo cov dej noo.
Txhim kho qhov compactness ntawm hydration khoom: Los ntawm kev tuav dej, HPMC txhim kho cov uniformity thiab compactness ntawm cement hydration cov khoom thiab txo cov pores loj nyob rau hauv mortar.
Qhov txo qis ntawm mortar porosity tsis tsuas yog txhim kho cov dej tsis zoo, tab sis kuj txhim kho cov kav dej ntawm cov mortar.
5. Txhim kho Frost tsis kam thiab kav ntev
Kev nkag mus ntawm cov dej yuav ua rau cov mortar puas vim Frost heaving nyob rau hauv qhov kub thiab txias. Cov nyhuv dej tsis zoo ntawm HPMC tuaj yeem txo cov dej nkag thiab txo qhov kev puas tsuaj rau mortar los ntawm kev khov-thaw mus:
Tiv thaiv kom tsis txhob muaj dej noo: Txo cov dej noo nyob hauv cov tshuaj khib nyiab thiab txo cov nyhuv Frost Heave.
Lub neej ntev mortar: Los ntawm kev txo cov dej tawm tsam thiab khov-thaw kev puas tsuaj, HPMC ua rau kom lub sijhawm ntev ntawm mortar.
HPMC txhim kho cov dej tsis zoo ntawm cov mortar los ntawm cov hauv qab no: txhim kho cov dej tuav, ua haujlwm kom zoo, tsim cov yeeb yaj kiab tiv thaiv, txo qhov porosity thiab txhim kho Frost. Cov nyhuv synergistic ntawm cov khoom no ua rau cov tshuaj khib kom pom cov dej tsis zoo hauv cov ntawv thov. Seb nyob rau hauv waterproofing mortars, self-leveling mortars los yog pobzeb adhesives,HPMCplays lub luag haujlwm tseem ceeb.
Hauv kev siv tswv yim, tus nqi ntawm HPMC ntxiv yuav tsum tau ua kom zoo raws li cov kev xav tau tshwj xeeb los xyuas kom meej tias nws tuaj yeem tsis tsuas yog ua kom cov dej tsis zoo, tab sis kuj tseem tswj hwm qhov sib npaug ntawm lwm qhov kev ua tau zoo ntawm cov mortar. Los ntawm kev siv qhov tsim nyog ntawm HPMC, kev ua haujlwm tsis zoo ntawm cov khoom siv hauv tsev tuaj yeem txhim kho tau zoo thiab muaj kev tiv thaiv zoo dua tuaj yeem muab rau cov haujlwm tsim kho.
Post lub sij hawm: Nov-23-2024