Kev tuav dej ntawm HPMC hauv masonry mortar

Raws li peb txhua tus paub, txoj kev xav ntawm kev ua kom tiav hydration ntawm cov cement xav tau 26% ntawm cov cement loj, thiab cov dej siv tiag tiag ntawm cov mortar zoo heev tshaj cov dej xav tau rau cov dej ntawm cov cement hauv mortar, uas feem ntau yog ua kom tau raws li qhov xav tau ntawm kev tsim kho. Lub zog ntawm cement pob zeb yog feem ntau cuam tshuam nrog cov dej-cement piv nrog rau. Qhov sib piv ntawm cov dej-cement ntau dua, qhov porosity ntawm cov cement pob zeb ntau dua, qhov qis zog ntawm cov cement pob zeb, thiab lub zog ntawm cov mortar tsawg dua. Yog li ntawd, tsuav yog dej tuav kev ua tau zoo ntawm cov masonry mortar ua kom cov mortar ua haujlwm thiab cov dej noo xav tau rau cov dej ntawm cov cement hauv mortar.

Yog hais tias cov dej tuav ntawm lub masonry mortar zoo dhau lawm, cov dej tiag tiag khaws cia hauv lub mortar yuav ntau dua, qhov sib piv ntawm cov dej-cement tiag tiag ntawm cov mortar yuav ntau dua, qhov tseeb lub zog ntawm cov mortar yuav qis dua, thiab lub zog ntawm cov mortar. kuj yuav txo. qis. Tsis tas li ntawd, cov dej tuav ntawm lub mortar yog qhov zoo heev, thiab cov dej tsis yooj yim absorbed los ntawm cov khoom thaiv, uas tseem yuav cuam tshuam rau kev sib txuas ntawm cov cement slurry thiab cov khoom thaiv, thiab ua kom lub sijhawm teem sijhawm ntawm cov mortar, yog li ntawd. cuam ​​tshuam rau kev ceev ntawm masonry thiab ua rau muaj kev nyuaj ntawm kev tsim kho. Yog li ntawd, qhov ntsuas dej tuav ntawm masonry mortar yuav tsum sib haum nrog cov khoom thaiv.

Yog hais tias lub pore qauv ntawm cov khoom thaiv tau qhib, thiab cov khoom thaiv tau yooj yim permeable los ntawm dej, xws li cov cib raug rho tawm haujlwm, cov dej tuav ntawm cov masonry mortar yuav qis dua, thiab ntau dua 80% tuaj yeem siv, xws li cib zoo tib yam. raug rho tawm haujlwm nrog tshuaj mortar rau masonry zoo heev.

Yog tias cov txheej txheem ntawm cov khoom thaiv raug kaw, qhov porosity siab, cov khoom thaiv tsis yooj yim nkag los ntawm dej, lossis cov khoom thaiv tsis raug tso cai kom ntub dej thaum lub sijhawm tsim kho, ces cov dej khaws cia ntawm cov cement mortar yuav tsum. nce cov mortar noo noo kom tau raws li qhov nruab nrab Yuav tsum tau rau cement hydration. Piv txwv li, nyob rau hauv kev tsim kho ntawm autoclaved txiv qaub-xuab zeb bricks, yog masonry mortar nrog ib tug dej tuav tus nqi ntawm 80% yog siv los tsim cov txiv qaub-xuab zeb cib, cov dej tuav ntawm lub mortar yog tsawg, thiab cov noo noo nyob rau hauv mortar yog yooj yim. absorbed los ntawm txiv qaub. Xuab zeb cib, ua rau muaj qhov tsis txaus ntawm cov dej uas yuav tsum tau muaj rau cov cement hydration hauv cov pob zeb sib txuas, yog li cov cement hydration tsis tuaj yeem ua tau ib txwm, txo qhov muaj zog tiag tiag ntawm cov mortar thiab lub zog sib txuas ntawm cov mortar thiab cov txiv qaub-xuab zeb cib. . Qhov no kuj yog ib qho ntawm cov laj thawj yog vim li cas cov tsoos mortar masonry yooj yim tawg. Yog li ntawd, cov dej tuav ntawm mortar rau masonry bricks yuav tsum tau tswj saum toj no 88%.

Txawm li cas los xij, yog tias peb nce cov dej tuav tus nqi ntawm cov mortar ntawm cov masonry bricks mus rau ntau tshaj 95%, nws yuav nyuaj rau nqus cov dej noo ntawm cov pob qij txha ntawm cov mortar, qhov tseeb lub zog ntawm cov mortar yuav txo, thiab lub zog ntawm daim ntawv cog lus. nruab nrab ntawm lub cib thiab phab ntsa kuj yuav txo. mortar thiab cib yuav raug txo. Cov dej tuav ntawm lub mortar yog qhov zoo heev, cov cib tsis yooj yim rau kev ua raws li cov mortar thaum lub sij hawm masonry, thiab cov mortar ruaj khov, thiab qhov siab ntawm cov masonry yog txwv.

Yog li ntawd, cov dej tuav ntawm hydroxypropyl methylcellulose nyob rau hauv masonry mortar tsis siab npaum li qhov ua tau, thiab cov khoom thaiv sib txawv yuav tsum muaj cov dej tuav kom haum.