2. Lub rhiab heev ntawm polycarboxylic acid dej reducer rau cov av nkos
Cov av nkos hauv cov khoom siv raw ntawm cov pob zeb, xuab zeb thiab pob zeb, yuav muaj kev cuam tshuam tsis zoo rau kev ua haujlwm ntawm pob zeb thiab txo cov kev ua haujlwm ntawm polycarboxylic acid dej reducer. Qhov laj thawj tseem ceeb yog vim li cas tom qab polycarboxylic acid dej reducer yog adsorbed los ntawm av nplaum nyob rau hauv ntau qhov ntau, qhov uas siv los tawg cov cement hais yog txo, thiab cov dispersibility yuav tsis zoo. Thaum cov av nkos cov ntsiab lus ntawm cov xuab zeb siab, cov dej txo tus nqi ntawm polycarboxylic acid dej reducer yuav txo qis, qhov poob ntawm cov pob zeb yuav nce, fluidity yuav txo, cov pob zeb yuav ua rau tawg, lub zog yuav txo, thiab lub durability yuav deteriorate.

Muaj ntau ntau txoj kev daws teeb meem rau cov teeb meem av nkos tam sim no:
(1) Ua kom muaj ntau npaum li cas los yog nce ntxiv ntxiv ib qho kev tso tawm qeeb qeeb-tiv thaiv tus neeg sawv cev hauv ib qho kev faib ua feem, tab sis tswj cov nyiaj kom tiv thaiv kom tsis txhob daj, los ntshav, kev sib cais, hauv qab rub thiab ntev dhau lub sijhawm ntawm pob zeb;
(2) Kho cov xuab zeb piv los yog nce tus nqi ntawm cov cua nkag mus. Nyob rau hauv qhov kev pom zoo ntawm kev ua kom muaj kev ua haujlwm zoo thiab lub zog, txo cov xuab zeb piv lossis nce tus nqi ntawm cov cua nkag mus rau kom cov dej dawb thiab muab tshuaj txhuam ntim ntawm cov pob zeb ua haujlwm, txhawm rau kho qhov kev ua tau zoo ntawm cov pob zeb;
(3) Ntxiv lossis hloov cov khoom tsim nyog los daws qhov teeb meem. Kev sim tau pom tias ntxiv qhov tsim nyog ntawm sodium pyrosulfite, sodium thiosulfate, sodium hexametaphosphate thiab sodium sulfate rau cov dej reducer tuaj yeem txo qhov cuam tshuam ntawm cov av nkos ntawm cov pob zeb rau qee yam. Tau kawg, cov txheej txheem saum toj no tsis tuaj yeem daws txhua yam teeb meem av nkos. Tsis tas li ntawd, qhov cuam tshuam ntawm av nkos cov ntsiab lus ntawm cov pob zeb durability xav tau kev kawm ntxiv, yog li cov kev daws teeb meem tseem ceeb yog txo cov av nkos ntawm cov khoom siv raw.