Redispersible latex hmoov thiab cov cement yog lub ntsiab sib txuas thiab cov yeeb yaj kiab tsim cov khoom ntawm dej-resistant putty. Lub hauv paus ntsiab lus ntawm dej-resistant yog:
Thaum lub sij hawm sib xyaw cov txheej txheem ntawm redispersible latex hmoov thiab cov cement, cov hmoov latex yog txuas ntxiv rov qab mus rau hauv daim ntawv emulsion qub, thiab cov latex hais tau sib npaug rau hauv cov cement slurry. Tom qab cov cement ntsib dej, cov tshuaj tiv thaiv hydration pib, cov tshuaj Ca (OH) 2 yog saturated thiab crystals yog precipitated, thiab ettringite crystals thiab hydrated calcium silicate colloids yog tsim nyob rau tib lub sij hawm, thiab cov latex hais tau tso rau ntawm lub gel thiab tsis muaj dej. ntawm cov cement particle.
Nrog rau kev nce qib ntawm cov tshuaj tiv thaiv hydration, cov khoom hydration txuas ntxiv mus ntxiv, thiab cov khoom latex maj mam sib sau ua ke hauv cov voids ntawm cov khoom siv tsis zoo xws li cov cement, thiab tsim cov txheej txheem nruj nreem rau ntawm cov cement gel. Vim tias maj mam txo qis ntawm cov dej qhuav qhuav, cov latex redispersed cov khoom nruj nreem ntim rau hauv cov gel thiab cov voids aggregate los ua ib zaj duab xis tas mus li, sib tov nrog cov cement paste interpenetrating matrix, thiab ua cov cement paste thiab lwm cov hmoov pob txha glued rau ib leeg. . Vim hais tias cov latex particles coagulate thiab tsim ib zaj duab xis nyob rau hauv lub interfacial hloov chaw ntawm cement thiab lwm yam hmoov, lub interfacial hloov chaw ntawm lub putty system yog ntau ntom, yog li txhim kho nws cov dej kuj.
Nyob rau tib lub sijhawm, cov pab pawg nquag tsim los ntawm cov kua roj hmab rov qab rov ua dua tshiab, xws li kev ua haujlwm monomer methacrylic acid tau qhia thaum lub sijhawm sib xyaw ntawm emulsion, muaj cov carboxyl pawg, uas tuaj yeem txuas nrog Ca2+, Al3+, thiab lwm yam. cement hnyav calcium hydration khoom. , tsim ib tug tshwj xeeb choj daim ntawv cog lus, txhim kho lub cev qauv ntawm cov cement mortar hardened lub cev, thiab txhim khu lub compactness ntawm putty interface. Lub redispersed latex particles tsim ib tug nruam thiab ntom zaj duab xis nyob rau hauv lub voids ntawm lub putty system.
Post lub sij hawm: Nov-01-2022