Hnub Kawg: 12 Lub Yim Hli, 2024
1. Polycarboxylic acid-based high-performance dej-txo tus neeg sawv cev yog txawv ntawm naphthalene-raws li high-performance dej-txo tus neeg saib xyuas nyob rau hauv uas:
Thawj yog qhov sib txawv thiab kho tau ntawm cov qauv molecular; qhov thib ob yog kom mloog zoo ntxiv thiab txhim kho qhov zoo ntawm cov dej ua haujlwm siab kom txo cov neeg ua haujlwm, thiab ua tiav cov txheej txheem tsim khoom ntsuab thiab tsis muaj kuab lom.
Los ntawm cov txheej txheem ntawm kev ua, cov qauv molecular ntawm polycarboxylic acid dej-txo tus neeg sawv cev yog comb-puab. Cov muaj zog polar anionic "anchoring" pawg nyob rau hauv cov saw tseem ceeb yog siv los adsorb ntawm cov cement hais. Sab nraud-extending zuag yog txhawb nqa los ntawm ntau ceg chains. Cov qauv hniav muab cov txiaj ntsig spatial txaus rau kev cuam tshuam ntxiv ntawm cov cement hais. Piv nrog rau cov hluav taws xob repulsion ntawm ob txheej hluav taws xob ntawm naphthalene-raws li cov dej txo cov neeg ua haujlwm, steric hindrance ua rau cov dispersion ntev dua.
Los ntawm kev hloov cov qauv zuag ntawm polycarboxylate dej-txo tus neeg saib xyuas kom tsim nyog thiab tsim nyog hloov qhov ntom thiab ntev ntawm cov saw hlau sab, cov dej-txo thiab siab thaum ntxov-zog dej-txo tus neeg sawv cev tsim nyog rau cov khoom siv prefabricated tuaj yeem tau txais.
Polycarboxylic acid-raws li dej-txo cov neeg ua haujlwm tuaj yeem hloov kho thiab hloov raws li qhov yuav tsum tau ua kom ua tiav lub hom phiaj ntawm kev hloov pauv kev ua tau zoo, tsis yog siv cov kev sib xyaw yooj yim rau kev hloov kho. Raws li qhov kev nkag siab no, nws yuav txhawb peb kom txhim kho peb cov kev siv thev naus laus zis yav tom ntej.
2. Lub adaptability ntawm polycarboxylic acid-raws li dej txo cov neeg ua haujlwm rau cementing cov ntaub ntawv:
Cov cement sib txawv muaj cov ntsiab lus sib txawv heev ntawm polycarboxylic acid-based superplasticizers, yog li nws tseem ceeb heev kom pom cov ntsiab lus saturation ntawm cov cement sib txawv. Txawm li cas los xij, yog tias tus neeg siv tau hais tias tsuas yog 1.0% raug tso cai ntxiv, yog tias cov cement xaiv tsis tuaj yeem hloov kho ntawm qhov ntau npaum li cas, nws yuav nyuaj rau tus neeg muab khoom siv los daws nws, thiab txoj kev sib xyaw ua ke feem ntau tsis tshua muaj txiaj ntsig.
Thawj-theem tshauv muaj qhov hloov tau zoo, thaum lub sij hawm thib ob thiab qib thib peb feem ntau tsis haum. Lub sijhawm no, txawm tias tus nqi ntawm polycarboxylic acid nce ntxiv, cov nyhuv tsis pom tseeb. Feem ntau thaum qee hom cement lossis ya tshauv muaj qhov tsis zoo rau cov khoom sib xyaw, thiab koj tseem tsis txaus siab kiag li thaum koj hloov mus rau lwm qhov sib xyaw, koj yuav tau hloov cov khoom cementitious.
3.Qhov teeb meem ntawm cov av nkos hauv cov xuab zeb:
Thaum cov av nkos cov ntsiab lus ntawm cov xuab zeb yog siab, cov dej-txo tus nqi ntawm polycarboxylate-raws li dej-txo tus neeg sawv cev yuav raug txo kom tsawg. Kev siv cov naphthalene-raws li dej-txo cov neeg ua haujlwm feem ntau daws tau los ntawm kev ua kom ntau npaum li cas, thaum cov tshuaj polycarboxylic acid-raws li dej-txo cov neeg ua haujlwm tsis hloov pauv ntau thaum ntau npaum li cas. Feem ntau, thaum lub fluidity tsis tau mus txog qhov xav tau, cov pob zeb tau pib los ntshav. Lub sijhawm no, cov nyhuv ntawm cov xuab zeb hloov pauv, nce cua cov ntsiab lus lossis ntxiv cov thickener yuav tsis zoo heev. Txoj kev zoo tshaj yog txo cov av nkos.
Post lub sij hawm: Aug-12-2024
