低水化热聚羧酸减水剂的制备及性能研究
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摘要
采用丙烯酸与(2-羟基苯基)磷酸酯化后得到的具有苯环和磷酸基团不饱和单体(P1),再与丙烯酸、异戊烯醇聚氧乙烯醚共聚制得低水化热聚羧酸减水剂P-DR,其最佳合成配比为:m(TPEG)∶m(P1)∶m(AA)∶m(H_2O_2)∶m(Vc)∶m(ME)=100∶12∶12∶1.1∶0.20∶0.40。净浆和混凝土试验结果表明,P-DR具有较高的分散性和保坍性,能有效降低水泥的水化放热速度,减小混凝土的电通量和收缩。
A low cement hydration heat polycarboxylate superplasticizer(P-DR) is obtained by unsaturated monomer(P1) with acrylic acid and isoprenolpolyoxyethylene ether. P1 is obtained by esterification of acrylic acid with(2-hydroxyphenyl) phosphate,having a benzene ring and a phosphate group,the best synthetic formula is m(TPEG)∶m(P1)∶m(AA)∶m(H_2O_2)∶m(Vc)∶m(ME)=100∶12∶12:1.1∶0.2∶0.40. The experimental results of concrete slurry and concrete show that the P-DR has high dispersion performance and slump retention ability,effectively reducing the speed of cement hydration and releasing heat,and can reduce the electric flux and shrinkage of concrete.
A low cement hydration heat polycarboxylate superplasticizer(P-DR) is obtained by unsaturated monomer(P1) with acrylic acid and isoprenolpolyoxyethylene ether. P1 is obtained by esterification of acrylic acid with(2-hydroxyphenyl) phosphate,having a benzene ring and a phosphate group,the best synthetic formula is m(TPEG)∶m(P1)∶m(AA)∶m(H_2O_2)∶m(Vc)∶m(ME)=100∶12∶12:1.1∶0.2∶0.40. The experimental results of concrete slurry and concrete show that the P-DR has high dispersion performance and slump retention ability,effectively reducing the speed of cement hydration and releasing heat,and can reduce the electric flux and shrinkage of concrete.
引文
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[5]汪漫,李仕祺,丁锐.高性能混凝土研究进展[J].四川水泥,2017(7):337-337.
[2]罗小艳,邓磊,蒋禹,等.浅谈聚羧酸减水剂的研究进展[J].中国建材科技,2017(6):104-105.
[3]郭翠芬,高礼雄,左彦峰,等.聚羧酸系减水剂研究最新进展[J].混凝土世界,2017(8):60-64.
[4]万宇超.大体积混凝土的研究进展[J].混凝土世界,2016(6):70-72.
[5]汪漫,李仕祺,丁锐.高性能混凝土研究进展[J].四川水泥,2017(7):337-337.