Molecular mechanism tsim ntawm polycarboxylic acid dej reducer
Polycarboxylic acid ua haujlwm siab dej txo tus neeg sawv cev tuaj yeem txo los ntshav ntau txoj hauv kev. Ua ntej ntawm tag nrho cov, polycarboxylic acid superplasticizer txo cov dej noj nyob rau hauv lub hauv paus ntawm kev ua hauj lwm ntawm cov cement-based cov ntaub ntawv. Thaum cov dej noj ntawm qhov sib tov txo, los ntshav yuav txo qis. Thib ob, polycarboxylic acid superplasticizer muaj cov txiaj ntsig zoo dispersion, muaj peev xwm ua kom tawg cov cement rau hauv dej, tiv thaiv kev sib haum xeeb ntawm cov khoom loj, kom txo tau los ntshav. Thib peb, polycarboxylic acid molecules yog adsorbed rau saum npoo ntawm cov cement hais, kom cov cement hais tawm ib leeg, txo qhov zoo ntawm cov cement particles flocculated nyob rau hauv ib pab pawg, ncua cov sedimentation tus nqi, txo cov dej los ntshav. Lwm qhov zoo dua yog tias cov molecules ntawm polycarboxylic acid superplasticizer yog customizable heev. Thaum qhov hnyav molecular me me, qhov tawg yuav nce ntxiv thiab los ntshav yuav txo qis me ntsis, tab sis tib lub sijhawm, qhov poob ntawm pob zeb fluidity yuav tsum tau txiav txim siab. Zoo ib yam li kev cuam tshuam ntawm qhov hnyav molecular ntawm los ntshav, cov ntsiab lus tseem ceeb ntawm cov saw adsorption pawg, graft chain density, ceg saw ntev thiab lwm yam hauv polycarboxylic acid molecule cuam tshuam cov ntshav ntawm cov pob zeb.
