Hnub Kawg:20,Feb,2023
Dab tsi yog dej txo tus neeg sawv cev?
Dej txo tus neeg sawv cev, tseem hu ua dispersant lossis plasticizer, yog cov khoom siv dav tshaj plaws thiab tseem ceeb tshaj plaws hauv kev npaj sib xyaw ua ke. Vim nws cov adsorption thiab dispersion, ntub dej thiab nplua cov teebmeem, nws tuaj yeem txo cov dej ntawm cov pob zeb tshiab nrog rau kev ua haujlwm zoo ib yam tom qab siv, yog li txhim kho lub zog, durability thiab lwm yam khoom ntawm pob zeb.
Tus neeg saib xyuas dej tuaj yeem muab faib ua ob hom raws li nws cov dej txo cov nyhuv: cov dej txo tus neeg saib xyuas thiab cov neeg ua haujlwm siab dej txo tus neeg sawv cev. Cov dej txo tus neeg sawv cev tuaj yeem sib xyaw nrog lwm cov khoom sib xyaw kom tsim tau lub zog thaum ntxov, hom hom, hom retarding thiab cua nkag hom dej txo tus neeg sawv cev raws li engineering xav tau hauv daim ntawv thov.
Cov tshuaj txo dej tuaj yeem muab faib ua lignosulfonate thiab nws cov derivatives, polycyclic aromatic sulfonic acid ntsev, dej-soluble resin sulfonic acid ntsev, aliphatic sulfonic acid ntsev, ntau dua polyols, hydroxy carboxylic acid ntsev, polyol complexes, polyoxyethylene ethers thiab lawv cov derivatives raws li lawv. lub ntsiab chemical Cheebtsam.
Dab tsi yog qhov kev txiav txim ntawm cov dej reducer?
Tag nrho cov dej txo cov neeg ua haujlwm yog cov neeg ua haujlwm saum npoo av. Cov dej txo cov nyhuv ntawm cov dej txo tus neeg saib xyuas yog pom tau los ntawm qhov ua haujlwm ntawm cov dej txo tus neeg sawv cev. Lub luag haujlwm tseem ceeb ntawm cov dej reducer yog raws li hauv qab no:
1) Cov dej reducer yuav adsorb ntawm cov khoom-kua interface, txo qhov nro saum npoo, txhim kho qhov ntub dej ntawm cov cement hais, txo cov thermodynamic tsis ruaj khov ntawm cov cement dispersion, thiab yog li tau txais kev txheeb ze ruaj khov.
2) Cov dej reducer yuav tsim cov adsorption directional adsorption ntawm cov cement hais, yog li ntawd cov cement hais yuav muaj tib yam nqi, tsim electrostatic repulsion, yog li rhuav tshem cov flocculated qauv ntawm cov cement hais thiab dispersing cement hais. Rau polycarboxylate thiab sulfamate superplasticizers, qhov adsorption ntawm superplasticizer yog nyob rau hauv daim ntawv ntawm lub nplhaib, hlau thiab iav, yog li nce qhov kev ncua deb ntawm cov cement hais los tsim electrostatic repulsion, qhia zoo dispersion thiab slump tuav.
3) Lub solvated dej zaj duab xis yog tsim los ntawm hydrogen daim ntawv cog lus ntawm cov dej reducer thiab dej molecules los tsim qhov chaw tiv thaiv, tiv thaiv kev sib cuag ncaj qha ntawm cov cement hais thiab tiv thaiv kev tsim cov qauv condensed.
4) Raws li cov txheej txheem adsorption yog tsim nyob rau saum npoo ntawm cov cement hais, nws tuaj yeem cuam tshuam qhov pib hydration ntawm cov cement, yog li ua kom cov dej dawb ntim thiab txhim kho fluidity ntawm cement paste.
5) Qee cov dej txo cov neeg ua haujlwm kuj tseem yuav qhia txog qee yam ntawm cov npuas dej kom txo tau qhov kev sib txhuam ntawm cov cement hais, yog li txhim kho cov dispersion thiab stability ntawm cement slurry.
Post lub sij hawm: Feb-20-2023
