Hnub Tim: 20, Jun, 2022

3. Cov mechanism ntawm kev ua ntawm superplasticizers

Lub tshuab ntawm dej txo tus neeg sawv cev los txhim kho cov fluidity ntawm pob zeb sib xyaw ua ke yog suav nrog cov nyhuv dispersing thiab lubricating nyhuv. Dej txo tus neeg sawv cev yog qhov tseeb surfactant, ib kawg ntawm cov hlua ntev heev hauv dej - Hydrophilic pab pawg - hydrophobic pab pawg.

a. Dispersion: Tom qab cov xis mas yog tov nrog dej, vim tias cov qauv molecular, li ntawd 10% ntawm cov dej sib xyaw ua ke thiab tsis tuaj yeem koom nrog dawb Ntws thiab lubrication. Cov nyhuv, yog li cuam tshuam cov fellity ntawm cov qhob sib xyaw. Thaum tus neeg sawv cev dej hauv dej ntxiv, vim hais tias cov dej txo tus neeg sawv cev rau ntawm cov khoom noj khoom haus kom zoo nkauj tau them tus nqi hloov pauv tau qub), tsim cov hluav taws xob tsis zoo), uas yog cov khoom siv hluav taws xob tsis zoo, uas Txhawb nqa cov dispersion ntawm cov cement hais thiab kev puas tsuaj ntawm cov qauv flocculation. , Tso cov ntawv qhwv uas tso tawm ntawm cov dej thiab koom nrog qhov ntws, yog li ua kom muaj txiaj ntsig zoo ntxiv ntawm cov qhob sib xyaw.

b. Lubrication: Pab Pawg Hydrophilic nyob rau hauv SuperPlasticizer yog heev poleces, yog li adas cov yeeb yaj kiab tuaj yeem ua kom muaj cov yeeb yaj kiab khov kho tuaj yeem txo cov zawv zawg Kev tawm tsam ntawm Caas hais tawm, yog li txuas ntxiv txhim kho lub fluidity ntawm qhob.

Cov nyhuv ntawm dej reducer ntawm pob zeb, thiab lwm yam.

a. Teem sijhawm. Superplasticizers feem ntau tsis muaj cov nyhuv tsis tas li, thiab tseem yuav txhawb nqa kev haus dej thiab cov cement. Lub retarded superplasticizer yog ib qho kev sib xyaw ntawm superplasticizer thiab Starder. Nyob rau hauv ib txwm muaj xwm txheej, nyob rau hauv thiaj li yuav ncua qhov kev hydration ntawm cov cement thiab txo cov kev poob qis, qee qhov nyiaj ntawm retarder ntxiv rau cov neeg saib xyuas dej.

b. Cov ntsiab lus nkev. Tam sim no, feem ntau siv polycarboxylate Reducer muaj cov ntsiab lus cua, thiab tsis yog cov qhob zog yuav tau txo qis heev.

c. Dej khaws cia.

SuperPlasticizers tsis ua rau muaj ntau ntau los txo cov ntshav ntawm cov pob zeb, thiab tuaj yeem nce los ntshav. Qhob los ntawm kev loj hlob nce thaum cov tshuaj yog ntau dhau.