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Research on synthesis process and performance of polycarboxylate concrete superplasticizer

MA Baoguo,TAN Hongbo,PAN Wei,XU Yonghe (Key Labortory for Silicate Materials Science Engineering of Ministry of Education,Wuhan University of Technology, Wuhan 430070,Hubei,China)  
Polyocarboxy acid water reducing agent was synthesized by copolymerization of macro-molecule monomer methylacrylic acid polyethylene glycol single armor ether ester (MAAMPEA),2-acrylic amide-2-methyl propyl sulfonic acid sodium (AMPS), and methylacrylic acid (MAA).Study has been made on its synthesis process and on performance of water reducing agent hydration heat-electricity and cement concrete. The result indicates that when n(MAAMPEA400)∶n(MAA)=1∶3,AMPS mole fraction is 10%,the initiator amount is 5%~7% of monomer weight,when the reaction temperature is 80 ℃, the synthesis copolymer water reducing agent has good dispersivity and disperser retentivity, and effectively suppress the cement hydration and exothermicity, delays the cement hydromass structure formation, which is close to the performance of overseas similar product.
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