Cawv ntawm cov qauv ntawm polycarboxylate superplasticizer ntawm nws cov kev ua tau zoo hauv cov khoom siv MAAs-txheeb xyuas

Polycarboxylate (PC) superplasticizers tau siv dav hauv cov pob zeb ua kev sib tov vim lawv qhov dej siab yuav txo qis thiab zoo rau cov kev poob qis ntawm kev noj tshuaj tsawg. Cov txheej txheem tshuaj lom neeg ntawm PC, suav nrog lawv cov pab pawg anchoring, cov saw tseem ceeb, sab saw, molecular phaus thiab cov qauv molecular, muaj qhov cuam tshuam zoo rau kev ua tiav ntawm cov khoom siv cement-based. Daim ntawv no xyuas cov kev sib raug zoo ntawm cov qauv siv tshuaj ntawm PCs thiab lawv cov kev ua tau zoo hauv cov khoom siv MAAs. Feem ntau, adsorption muaj peev xwm ntawm PCs nrog txiv neej anhydride, phosphate thiab silanol pawg yog siab dua li ntawm –COO− pawg, thiab tsis cuam tshuam tsawg thaum sulfate ions (SO 42 -) muaj. Lawv thawj zaug kev faib tawm zuj zus nrog rau cov ntsiab lus ntawm cov pab pawg anchoring. Cov PC nrog cov saw loj ntev, cov hlua txuas sab ntev lossis loj lub cev hnyav qhia tau ntau dua flowability swb cia ntawm cov xis mas pastes. Cov nyhuv retardation ntawm PC ntawm cement hydration nce nrog lub ntsiab qhov ntev ntev. Ntxiv mus, hyperbranched thiab lub hnub qub zoo li lub PC qhia pom tau zoo dua qhov kev muaj peev xwm dispersion ces cov khoom sib luag.