Sai li sai tau cov khoom siv Maas hais ntxiv nrog cov tshuaj tua kab, thiab cov muaj kua qaub nciab, thiab tib lub sijhawm, ettringite, thiab calcium silicate hydrate gels yog tsim. Cov khoom ruaj khov yog muab tso rau ntawm cov gel thiab cov hloov pauv tsis tau yooj yim. Raws li cov tshuaj tiv thaiv hydr
Lub agerregated polymer hais me me sau cov pores, tab sis tsis tag rau sab hauv ntawm lub qhov hws ntawm lub pores. Raws li cov dej yog txo ntxiv los ntawm kev ua kom qhuav lossis ziab khaub ncaws pawm ntawm cov gel thiab hauv cov hmoov av sib txuas nrog cov khoom siv hydration thiab txhim kho hydration kev sib txuam ntawm cov khoom lag luam thiab aggregates. Vim tias cov khoom siv dej haus nrog cov polymers tsim ib txheej npog ntawm lub interface, nws yuav cuam tshuam rau kev loj hlob ntawm ettringite thiab coarse calcium hydroxide muaju; Thiab vim tias cov polymers sib tsoo rau hauv cov yeeb yaj kiab hauv cov qhov kev hloov pauv ntawm qhov kev hloov pauv, cov khoom siv ua haujlwm polymer-raws li cov chaw hloov chaw yog denser. Cov pab pawg nquag hauv qee cov qauv kev sib txawv, txhim kho lub cev cov khoom sib txawv, ua kom muaj kev ntxhov siab rau sab hauv, thiab txo qis tiam ntawm microcracks. Raws li cov tshuaj tsw qab gel tsim, cov dej tau noj thiab cov polymer hais yog maj mam kaw hauv lub qhov hws. Raws li cov hmoov av yog qhov ua kom noo nyob hauv cov capill txheej txheem sib xyaw thiab cov qoob loo polymer sib xyaw ua ke thiab ua tiav cov txheej sib txawv nrog nplaum lossis tus kheej-nplaum polymer hais.
Lub luag haujlwm ntawm redispersible latex hmoov nyob rau hauv cug yog tswj tau tswj los ntawm ob txoj kev hloov ntawm cov xis mas polymer zaj duab xis tsim. Kev tsim ntawm cov kev sib xyaw ua ke ntawm txoj kev xis tsib thiab polymer zaj duab xis thiab ua yeeb yaj kiab ua tiav nyob rau hauv 4 kauj ruam:
(1) Tom qab Redispersible looj hmoov yog sib xyaw nrog cov xis qab cug, nws yog tusyees dispersed hauv lub system;
(2) Cov neeg polymer tau muab tso rau saum npoo ntawm txoj kev ntseegzas cov khoom lag luam gel / tsis muaj kev sib xyaw ua ke;
(3) cov polymer hais ua ib txheej txuas ntxiv thiab ua kom tiav txheej;
(4) Thaum lub sij hawm cov txheej txheem casent coasas, cov khoom ntim zoo sib xyaw ua ke rau hauv cov khoom sib txuas ua ke los ua cov qauv hydration ua ke los ua tus qauv sib txuas ua ke.
Lub dispulsed emulsion ntawm redispersible cov hmoov nplej tau tuaj yeem tsim cov yeeb yaj kiab ua ntej (polymer network polymer network tuaj yeem txhim kho kev ua tau zoo ntawm cov cement; Nyob rau tib lub sijhawm, nyob rau hauv cov polymer molecule qee cov pab pawg neeg cov khoom siv tshwj xeeb ntawm cov khoom siv ntawm cov txiv xis. Tom qab redispersible looj hmoov yog ntxiv, thawj zaug ua yeeb yam kom qeeb, thiab cov xis nyob kom meej tuaj yeem hloov kho thiab nws cov khoom siv ntau ntxiv tuaj yeem hloov kho.
Redispersible yas hmoov ua lub luag haujlwm tseem ceeb ua kev ntxiv rau kev siv cug. Ntxiv recispersible looj tuaj yeem npaj muaj cov tshuaj khib, muab cov tshuaj khib nyiab, kho kom zoo nkauj, thiab cov tshuaj tua hluav taws xob, thiab lwm yam thov kev ua tau zoo ntawm kev siv kab. Ntawm chav kawm, muaj cov teeb meem zoo ntawm redispersible looj hmoov thiab Maas, uas yuav tsum tau txais kev saib xyuas muaj txiaj ntsig zoo hauv cov ntawv thov.
Lub Sijhawm Post: Mar-14-2023