Hydroxypropyl methylcellulose (HPMC) feem ntau ua lub luag haujlwm ntawm cov dej tuav, thickening thiab txhim kho kev tsim kho hauv cov cement, gypsum thiab lwm cov ntaub ntawv hmoov.Kev ua tau zoo ntawm cov dej tuav tau zoo tuaj yeem tiv thaiv cov hmoov los ntawm kev ziab thiab tawg vim yog dej ntau dhau, thiab ua kom cov hmoov muaj lub sijhawm siv ntev dua.
Ua cov khoom siv cementitious, aggregates, aggregates, dej tuav cov neeg ua haujlwm, cov khoom sib txuas, kev tsim kho kev ua haujlwm, thiab lwm yam. Piv txwv li, gypsum-based mortar muaj kev sib raug zoo dua li cov cement-based mortar hauv lub xeev qhuav, tab sis nws cov kev sib raug zoo txo qis. sai sai nyob rau hauv cov xwm txheej ntawm noo noo nqus thiab nqus dej.Lub hom phiaj kev sib txuas lub zog ntawm plastering mortar yuav tsum tau txo cov txheej los ntawm txheej, uas yog, lub zog sib txuas ntawm lub hauv paus txheej thiab tus neeg saib xyuas kev kho mob ≥ lub zog sib txuas ntawm lub hauv paus txheej mortar thiab tus neeg saib xyuas kev kho mob ≥ kev sib raug zoo ntawm lub hauv paus. txheej mortar thiab txheej txheej mortar Strength ≥ lub zog sib txuas ntawm cov tshuaj khib nyiab thiab cov khoom siv putty.
Lub hom phiaj hydration zoo tshaj plaws ntawm cov cement mortar ntawm lub hauv paus yog cov khoom siv cement hydration absorbs dej nrog rau lub hauv paus, nkag mus rau hauv lub hauv paus, thiab tsim kom muaj "kev sib txuas tseem ceeb" nrog lub hauv paus, txhawm rau ua kom tiav qhov yuav tsum tau muaj zog.Kev ywg dej ncaj qha rau ntawm qhov chaw ntawm lub hauv paus yuav ua rau muaj kev cuam tshuam loj heev hauv cov dej nqus ntawm lub hauv paus vim qhov sib txawv ntawm qhov kub thiab txias, lub sijhawm watering, thiab watering uniformity.Lub hauv paus muaj qhov nqus dej tsawg dua thiab yuav txuas ntxiv nqus cov dej hauv cov mortar.Ua ntej cov cement hydration pib, cov dej yog absorbed, uas cuam tshuam cov cement hydration thiab nkag mus rau cov khoom hydration rau hauv matrix;lub hauv paus muaj qhov nqus dej loj, thiab cov dej hauv cov mortar ntws mus rau hauv paus.Qhov nruab nrab ntawm kev tsiv teb tsaws yog qeeb, thiab txawm tias cov dej nplua nuj txheej yog tsim ntawm mortar thiab matrix, uas tseem cuam tshuam rau lub zog ntawm daim ntawv cog lus.Yog li ntawd, kev siv cov txheej txheem dej hauv paus yuav tsis tsuas yog ua tsis tau zoo los daws qhov teeb meem ntawm kev nqus dej siab ntawm phab ntsa hauv paus, tab sis yuav cuam tshuam rau lub zog sib txuas ntawm cov mortar thiab lub hauv paus, uas ua rau hollowing thiab tawg.
Cov nyhuv ntawm cellulose ether ntawm compressive thiab shear zog ntawm cement mortar.
Nrog rau qhov sib ntxiv ntawm cellulose ether, compressive thiab shear zog txo, vim hais tias cov cellulose ether absorbs dej thiab tsub kom lub porosity.
Kev sib koom ua ke thiab kev sib koom ua ke lub zog nyob ntawm seb qhov sib cuam tshuam ntawm cov tshuaj khib thiab cov khoom siv hauv paus tuaj yeem ua kom ruaj khov thiab ua haujlwm tau zoo "kev sib txuas tseem ceeb" rau lub sijhawm ntev.
Cov xwm txheej cuam tshuam rau kev sib raug zoo muaj xws li:
1. Cov yam ntxwv ntawm kev nqus dej thiab roughness ntawm substrate interface.
2. Lub peev xwm tuav dej, qhov nkag tau thiab lub zog ntawm cov tshuaj khib nyiab.
3. Cov cuab yeej siv, kev tsim kho thiab kev tsim kho ib puag ncig.
Vim hais tias lub hauv paus txheej rau mortar tsim muaj tej yam dej nqus, tom qab lub hauv paus txheej absorbs dej nyob rau hauv lub mortar, lub constructability ntawm lub mortar yuav deteriorated, thiab nyob rau hauv loj heev zaum, cov cementitious cov ntaub ntawv nyob rau hauv lub mortar yuav tsis tau tag nrho hydrated, ua rau muaj kev cuam tshuam loj heev. nyob rau hauv lub zog, tshwj xeeb Yog vim li cas yog hais tias lub interface lub zog ntawm lub hardened mortar thiab lub hauv paus txheej yuav qis dua, ua rau lub mortar tawg thiab poob tawm.Txoj kev daws teeb meem ib txwm muaj rau cov teeb meem no yog dej hauv lub hauv paus, tab sis nws tsis tuaj yeem ua kom ntseeg tau tias lub hauv paus yog moistened.
Post lub sij hawm: May-06-2023