Hom Kev Ua Haujlwm ntawm Cov Khoom Siv Hluav Taws Xob Cov Hluav Taws Xob Hluav Taws Xob
Lub luag haujlwm tseem ceeb ntawm cov txheej txheem ntawm kev txo cov dej thiab teeb tsa retardation ntawm admixtures feem ntau yog tsim los ntawm cov saw hlau ntev organic molecules thiab uas yog hydrophobic (tsis ntub dej) ntawm ib qho kawg thiab hydrophilic (nyeem ntub dej) ntawm lwm qhov.
Xws li cov molecules zoo li ua kom muaj zog thiab tsim ib zaj duab xis ntawm qhov sib cuam tshuam ntawm ob theem immiscible xws li xis mas thiab dej, thiab hloov lub cev-tshuaj rog ua yeeb yam ntawm no interface.
Lub tshuab ua los ntawm Cov Khoom Siv Hluav Taws Xob Cov Hluav Taws Xob Hluav Taws Xob ua haujlwm yog kom deflocculated los yog disperse cov cement agglomerates rau hauv cov ntsiab lus tseem ceeb los yog tsawg kawg rau hauv ntau qhov me me.
Qhov no deflocculating yog ntseeg los ua ib tug physio tshuaj nyhuv uas yog cov admixture yog thawj zaug ntawm tag nrho cov adsorbed rau saum npoo ntawm hydrating cement, tsim ib tug hydration "sheath", txo cov antiparticle sib cais ntawm ib leeg.
Vim li cas cov khoom no siv?
a) Tsis tas yuav tsum muaj dej ntxiv los ua cov pob zeb nrog kev ua haujlwm ntau dua, yog li tsis muaj qhov poob ntawm lub zog
b) Ib qho kev ua haujlwm tau raug tswj xyuas, tab sis nyob rau hauv cov dej qis, cov pob zeb ua kom muaj zog tuaj yeem nce ntxiv yam tsis muaj cov cement ntxiv
c) Cov pob zeb tuaj yeem ua rau tib lub zog raws li cov ntaub ntawv siv ntawm cov cement qis thaum ua kom cov dej-carbon piv thiab kev ua haujlwm tsis hloov.
Cov nyhuv ntawm durability
Qhov sib ntxiv ntawm cov khoom sib xyaw ntawm Cov Khoom Siv Hluav Taws Xob Cov Dej Txias tsis tuaj yeem nce permeability thiab qhov tseeb qhov twg cov tshuaj siv los txo cov w / c, ces permeability txo qis heev.
Qhov cuam tshuam rau shrinkage
Admixture ntawm hom no thaum siv los ua kev pabcuam ua haujlwm ntawm cov dej reducers tsis cuam tshuam rau qhov shrinkage.
Qhov cuam tshuam rau creep
Cov khoom siv ntawm cov khoom sib xyaw no tsis muaj kev cuam tshuam rau qhov creep ntawm pob zeb.
Cov teebmeem tsis zoo
a) Thaum siv cov dej txo qis. Kev saib xyuas yuav tsum tau coj los tswj cov huab cua hauv qhov sib tov. Feem ntau cov dej reducers qhia huab cua vim yog cov khoom ntawm surfactants.
b) Thaum noj cov khoom siv lignosulfonate siab, hysteresis ntawm qhov sib tov tshwm sim.
Cim npe nrov: pob zeb admixture dej txo tus neeg sawv cev, manufacturers, lwm tus neeg, Hoobkas, nqe
