Hydroxypropyl methylcellulose (HPMC) feem ntau ua lub luag haujlwm ntawm kev khaws dej, ua kom tuab thiab txhim kho kev ua haujlwm ntawm kev tsim kho hauv cov cement, gypsum thiab lwm yam khoom siv hmoov. Kev ua tau zoo ntawm kev khaws dej zoo tuaj yeem tiv thaiv cov hmoov kom tsis txhob qhuav thiab tawg vim muaj dej ntau dhau, thiab ua rau cov hmoov siv sijhawm tsim kho ntev dua.
Xaiv cov khoom siv cementitious, aggregates, aggregates, cov neeg sawv cev tuav dej, cov khoom khi, cov khoom hloov kho kev ua haujlwm ntawm kev tsim kho, thiab lwm yam. Piv txwv li, gypsum-based mortar muaj kev ua tau zoo dua li cement-based mortar hauv qhov qhuav, tab sis nws qhov kev ua tau zoo ntawm kev sib txuas txo qis sai sai nyob rau hauv qhov xwm txheej ntawm kev nqus dej thiab kev nqus dej. Lub zog sib txuas ntawm lub hom phiaj ntawm plastering mortar yuav tsum tau txo qis txheej los ntawm txheej, uas yog, lub zog sib txuas ntawm cov txheej hauv paus thiab tus neeg sawv cev kho interface ≥ lub zog sib txuas ntawm cov txheej hauv paus thiab tus neeg sawv cev kho interface ≥ lub zog sib txuas ntawm cov txheej hauv paus thiab cov mortar txheej saum npoo Lub zog ≥ lub zog sib txuas ntawm cov mortar saum npoo thiab cov khoom siv putty.
Lub hom phiaj zoo tshaj plaws ntawm cov cement mortar ntawm lub hauv paus yog tias cov khoom cement hydration nqus 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, kom ua tiav lub zog sib txuas uas xav tau. Kev ywg dej ncaj qha rau ntawm qhov chaw ntawm lub hauv paus yuav ua rau muaj kev sib kis loj hauv kev nqus dej ntawm lub hauv paus vim qhov sib txawv ntawm qhov kub thiab txias, lub sijhawm ywg dej, thiab kev sib npaug ntawm kev ywg dej. Lub hauv paus muaj kev nqus dej tsawg dua thiab yuav txuas ntxiv nqus cov dej hauv cov mortar. Ua ntej cov cement hydration txuas ntxiv mus, cov dej raug nqus, uas cuam tshuam rau cov cement hydration thiab kev nkag mus ntawm cov khoom hydration rau hauv matrix; lub hauv paus muaj kev nqus dej loj, thiab cov dej hauv cov mortar ntws mus rau lub hauv paus. Qhov nruab nrab migration ceev qeeb, thiab txawm tias ib txheej nplua nuj dej tau tsim ntawm cov mortar thiab matrix, uas kuj cuam tshuam rau lub zog sib txuas. Yog li ntawd, kev siv cov txheej txheem dej hauv paus yuav tsis tsuas yog ua tsis tiav los daws qhov teeb meem ntawm kev nqus dej ntau ntawm lub hauv paus phab ntsa, tab sis yuav cuam tshuam rau lub zog sib txuas ntawm cov mortar thiab lub hauv paus, ua rau hollowing thiab tawg.
Cov nyhuv ntawm cellulose ether rau ntawm lub zog compressive thiab shear ntawm cement mortar.
Nrog rau kev ntxiv ntawm cellulose ether, lub zog compressive thiab shear txo qis, vim tias cellulose ether nqus dej thiab ua rau porosity nce.
Qhov kev ua tau zoo ntawm kev sib txuas thiab lub zog sib txuas nyob ntawm seb qhov sib txuas ntawm cov mortar thiab cov khoom siv hauv paus puas tuaj yeem ua tiav "kev sib txuas tseem ceeb" tau ntev thiab ruaj khov.
Cov yam tseem ceeb uas cuam tshuam rau lub zog ntawm daim ntawv cog lus suav nrog:
1. Cov yam ntxwv ntawm kev nqus dej thiab qhov roughness ntawm lub substrate interface.
2. Lub peev xwm khaws dej, lub peev xwm nkag mus thiab lub zog ntawm cov mortar.
3. Cov cuab yeej siv hauv kev tsim kho, cov txheej txheem tsim kho thiab ib puag ncig kev tsim kho.
Vim tias cov txheej hauv paus rau kev tsim cov mortar muaj qee qhov kev nqus dej, tom qab cov txheej hauv paus nqus cov dej hauv cov mortar, qhov kev tsim kho ntawm cov mortar yuav poob qis, thiab hauv cov xwm txheej hnyav, cov khoom siv cementitious hauv cov mortar yuav tsis tau hydrated tag nrho, ua rau muaj zog, tshwj xeeb. Qhov laj thawj yog tias lub zog sib txuas ntawm cov mortar tawv thiab cov txheej hauv paus qis dua, ua rau cov mortar tawg thiab poob tawm. Cov kev daws teeb meem ib txwm rau cov teeb meem no yog dej rau lub hauv paus, tab sis nws tsis yooj yim sua kom ntseeg tau tias lub hauv paus tau ntub dej sib npaug.
Lub sijhawm tshaj tawm: Tsib Hlis-06-2023