Dej txo tus neeg sawv cev, tseem hu ua plasticizer

Dej txo tus neeg sawv cev, tseem hu ua plasticizer, yog cov khoom siv dav siv tshaj plaws tam sim no. Feem ntau ntawm cov dej reducers yog surfactants, uas yog siv rau saum npoo ntawm cov pob zeb. Surfactant molecules yog tsim los ntawm pawg hydrophobic thiab pawg hydrophilic. Cov pawg hydrophobic feem ntau yog ntau yam organic compound hydrocarbons. Chav kawm, pawg hydrophilic yog cov ntsev uas tuaj yeem cuam tshuam ntau yam ions.

Tsis tas li ntawd, cov dej txo tus neeg sawv cev kuj muaj kev ua haujlwm ntawm ntub cov cement hais thiab lubricating, tsuav yog siv cov dej me me, cov pob zeb tuaj yeem sib xyaw tau yooj yim sib npaug, kom cov haujlwm ua haujlwm ntawm cov pob zeb sib xyaw tshiab tau txhim kho. , los yog nyob rau hauv cov xwm txheej ntawm kev ua haujlwm tsis hloov pauv, cov dej-cement piv ntawm cov pob zeb yog txo qis, thiab nws plays lub luag hauj lwm ntawm dej txo thiab txhim kho.

Lub taub hau ntawm superplasticizer molecule yog hydrophilic, thiab tus Tsov tus tw ntev yog hydrophobic, thiab tus naj npawb ntawm cov dej molecules hauv cov pob zeb tshiab yog pom tseeb ntau dua li ntawm cov superplasticizer molecule. Hauv qhov no, peb tuaj yeem sib piv cov dej txo tus neeg sawv cev molecules rau cov ntses hauv dej. Nws ua luam dej ua rau muaj kev ntxhov siab, kom cov dej molecules tuaj yeem ua lawv lub luag haujlwm ntau dua; Tsis tas li ntawd, thaum muaj coob tus dej molecules undergo hydration, lub superplasticizer molecules yuav lawm los nag los ntawm cov aqueous tov, thiab cov cement hais yog qhov zoo tagnrho nucleation chaw, yog li cov superplasticizer molecules yuav maj mam txuas mus rau cov cement hais los ua ib tug solvated dej zaj duab xis. ; Nyob rau hauv tas li ntawd, vim nws hydrophilic Lub luag hauj lwm ntawm pab pawg neeg ua rau nws tsis kiag li insoluble nyob rau hauv dej zoo li roj, uas yuav cuam tshuam rau cov pH ntawm cov pob zeb tshiab rau ib tug tej yam.