Kev txhim kho thiab kev siv ntawmpolycarboxylic superplasticizeryog tus ceev heev.Tshwj xeeb tshaj yog nyob rau hauv loj thiab tseem ceeb tej yaam num xws li kev txuag dej, hydropower, hydraulic engineering, marine engineering, thiab txuas hniav, polycarboxylate superplastisizer yog dav siv.
Tom qab cov cement sib tov nrog dej, cov cement slurry tsim cov qauv flocculation vim lub molecular gravity ntawm cov cement hais, kom 10% mus rau 30% ntawm cov dej sib tov yog qhwv rau hauv cov cement hais thiab tsis tuaj yeem koom nrog hauv kev khiav dawb thiab lubrication. , yog li cuam tshuam rau Flowability ntawm pob zeb sib tov.Thaum lub supreplasticizer ntxiv, cov dej-txo tus neeg sawv cev molecules tuaj yeem coj mus rau adsorbed ntawm cov cement hais, kom qhov chaw ntawm cov cement hais muaj tib tus nqi (feem ntau tsis zoo), tsim electrostatic repulsion, uas txhawb kev sib nrig sib. dispersion ntawm cov cement hais thiab kev puas tsuaj ntawm cov qauv flocculation., tso ib feem ntawm cov ntaub qhwv dej los koom rau hauv qhov ntws, yog li ua kom cov dej ntws zoo ntawm cov pob zeb sib xyaw.
Hydrophilic pawg nyob rau hauv lubdej-txo tus neeg sawv cevyog cov polar heev, yog li cov dej-txo tus neeg saib xyuas adsorption zaj duab xis ntawm cov cement hais tuaj yeem tsim cov dej khov dej ruaj khov nrog cov dej molecules.Cov yeeb yaj kiab dej no muaj cov txiaj ntsig zoo lubrication thiab tuaj yeem txo cov zawv zawg tiv thaiv ntawm cov cement hais, yog li ntxiv txhim kho cov kua dej ntawm mortar thiab pob zeb.
Hydrophilic branched saw nyob rau hauv lubsuperplasticizerqauv stretches nyob rau hauv lub aqueous tov, yog li tsim ib tug hydrophilic peb-dimensional adsorption txheej nrog ib tug tej thickness ntawm lub adsorbed cement hais.Thaum cov cement hais nyob ze rau ib leeg, cov txheej txheem adsorption pib sib tshooj, uas yog, steric hindrance tshwm sim ntawm cov cement hais.Qhov sib tshooj ntau dua, qhov ntau dua qhov steric repulsion, thiab qhov ntau dua qhov cuam tshuam rau kev sib koom ua ke ntawm cov cement hais, ua rau cov mortar thiab pob zeb Slump tseem zoo.
Thaum lub sij hawm kev npaj ntawm lubpolycarboxylate dej-txo tus neeg sawv cev, qee cov saw hlau yog grafted ntawm cov molecules ntawm cov dej-txo tus neeg sawv cev.Cov ceg ntoo no tsis yog tsuas yog muab cov nyhuv steric hindrance xwb, tab sis kuj, nyob rau hauv qhov chaw siab alkalinity ntawm cov cement hydration, cov ceg saw tseem tuaj yeem maj mam txiav tawm, yog li tso tawm polycarboxylic acid nrog cov nyhuv dispersing, uas tuaj yeem txhim kho cov nyhuv dispersion ntawm cov cement thiab tswj slump poob.
Lub sij hawm xa tuaj: Mar-29-2024