Raws li cov nplaum tseem ceeb ntawm putty, tus nqi ntawm redispersible latex hmoov muaj qhov cuam tshuam rau kev sib txuas ntawm lub zog ntawm putty.Daim duab 1 qhia txog kev sib raug zoo ntawm cov nyiaj redispersible latex hmoov thiab daim ntawv cog lus lub zog.Raws li tau pom los ntawm daim duab 1, nrog rau nce ntawm tus nqi ntawm re-dispersible latex hmoov, daim ntawv cog lus lub zog maj mam nce. Thaum tus nqi ntawm cov hmoov latex me me, lub zog sib txuas ntxiv nrog qhov nce ntawm cov hmoov latex. Yog tias qhov ntau npaum li cas ntawm emulsion hmoov yog 2%, daim ntawv cog lus muaj zog mus txog 0182MPA, uas ua tau raws li lub teb chaws tus qauv ntawm 0160MPA. Yog vim li cas yog tias hydrophilic latex hmoov thiab cov kua theem ntawm cov cement suspension permeate mus rau hauv lub pores thiab capillary ntawm lub matrix, cov latex hmoov ntaub ntawv zaj duab xis nyob rau hauv pores thiab capillaries thiab yog nrees adsorbed rau saum npoo ntawm lub matrix, yog li xyuas kom meej ib tug zoo. Lub zog sib txuas ntawm cov khoom siv cementing thiab matrix [4] . Thaum lub putty raug tshem tawm ntawm lub phaj xeem, nws tuaj yeem pom tias qhov nce ntawm cov hmoov latex nce qhov adhesion ntawm putty rau lub substrate. Txawm li cas los xij, thaum tus nqi ntawm cov hmoov latex ntau dua 4%, qhov nce ntawm kev sib khi lub zog tau qeeb. Tsis tsuas yog redispersible latex hmoov, tab sis kuj cov ntaub ntawv inorganic xws li cov cement thiab hnyav calcium carbonate pab txhawb lub zog ntawm lub zog ntawm putty.
Cov dej tsis kam thiab alkali tsis kam ntawm putty yog qhov ntsuas tseem ceeb los txiav txim seb putty tuaj yeem siv los ua dej tsis kam ntawm phab ntsa sab hauv lossis sab nrauv phab ntsa. Fig. 2 tshawb xyuas qhov tshwm sim ntawm cov nyiaj rov qab dispersible latex hmoov ntawm cov dej tsis kam ntawm putty
Raws li tuaj yeem pom los ntawm daim duab 2, thaum tus nqi ntawm cov hmoov latex tsawg dua 4%, nrog rau qhov nce ntawm cov hmoov latex, cov dej nqus dej qhia tau hais tias kev poob qis. Thaum noj ntau dua 4%, qhov nqus dej tau maj mam txo qis. Qhov laj thawj yog vim li cas cov cement yog cov khoom siv khi rau hauv putty, thaum tsis muaj redispersible latex hmoov ntxiv, muaj ntau cov voids nyob rau hauv lub cev, thaum redispersible latex hmoov ntxiv, emulsion polymer tsim tom qab re-dispersion tuaj yeem condense rau hauv ib qho. zaj duab xis nyob rau hauv lub putty voids, kaw cov voids nyob rau hauv lub putty system, thiab ua lub putty txheej thiab scraping los ua ib tug denser zaj duab xis nyob rau saum npoo tom qab ziab, yog li zoo tiv thaiv dej infiltration, txo cov dej nqus dej, thiaj li hais tias nws enhanced. dej tsis kam. Thaum noj cov hmoov latex nce mus txog 4%, cov tshuaj redispersible latex hmoov thiab redispersible polymer emulsion tuaj yeem ua tiav cov voids hauv cov txheej txheem putty kom tiav thiab tsim ib zaj duab xis tiav thiab ntom, yog li, qhov nyiam ntawm qhov txo qis ntawm cov dej nqus ntawm putty. ua du nrog qhov nce ntawm tus nqi ntawm cov hmoov latex.
Los ntawm kev muab piv rau SEM dluab ntawm putty ua los ntawm kev ntxiv redispersible latex hmoov los yog tsis, nws yuav pom tau hais tias nyob rau hauv daim duab 3(a), cov ntaub ntawv inorganic tsis muaj tag nrho cov sib koom, muaj ntau voids, thiab cov voids tsis sib npaug zos faib, yog li ntawd, nws daim ntawv cog lus lub zog tsis zoo tagnrho. Ntau cov voids hauv qhov system ua rau cov dej yooj yim rau infiltrate, yog li cov dej nqus tau siab dua. Nyob rau hauv daim duab 3(b), cov emulsion polymer tom qab re-dispersing tuaj yeem ua tiav cov voids hauv cov txheej txheem putty thiab tsim ua tiav cov yeeb yaj kiab, kom cov khoom siv tsis zoo hauv tag nrho cov txheej txheem putty tuaj yeem sib koom ua ke ntau dua, thiab tsis yog. muaj qhov sib txawv, yog li ntawd tuaj yeem txo qhov nqus dej putty. Xav txog kev cuam tshuam ntawm cov hmoov latex ntawm kev sib txuas ntawm lub zog thiab dej tsis kam ntawm putty, thiab txiav txim siab tus nqi ntawm cov hmoov latex, 3% ~ 4% ntawm cov hmoov latex yog qhov tsim nyog. Kev txiav txim siab redispersible latex hmoov tuaj yeem txhim kho lub zog sib txuas ntawm putty. Thaum nws qhov ntau npaum li cas yog 3% ~ 4%, putty muaj kev sib raug zoo siab thiab dej tsis kam
Post lub sij hawm: Lub Xya hli ntuj-19-2023