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以减缩活性单体2-(2-丁氧乙氧基)乙醇丙烯酸酯(MBDEGAA)、丙烯酸(AA)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)与聚乙二醇单甲醚丙烯酸酯(MPEGAA)为聚合单体,在水溶液中通过聚合反应,合成了一种高分子聚合物(HP-SRA)。采用红外光谱、核磁共振氢谱和凝胶渗透色谱对HP-SRA分子结构和相对分子质量及其分布进行了表征。并测定了掺入质量分数为0.30%(固含量)的HP-SRA混凝土的减缩性能及应用性能。结果表明,当n(MPEGAA)∶n(MBDEGAA)∶n(AA)∶n(AMPS)=1∶2.15∶2.15∶1.10时,水泥砂浆减缩率最高,水泥净浆流动度及其保持能力最佳。在不影响混凝土应用性能基础上,减缩基团的引入有利于提高混凝土的减缩性能。
(2-butoxyethoxy) ethanol acrylate (MBDEGAA), acrylic acid (AA), 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and polyethylene glycol mono Methyl Ether Acrylate (MPEGAA) is a polymeric monomer. A polymer (HP-SRA) is synthesized by polymerization in aqueous solution. The molecular structure, molecular weight and distribution of HP-SRA were characterized by FTIR, 1H NMR and gel permeation chromatography. The shrinkage performance and application performance of HP-SRA concrete with mass fraction of 0.30% (solid content) were determined. The results show that the shrinkage rate of cement mortar is the highest when the content of n (MPEGAA): n (MBDEGAA): n (AA): n (AMPS) = 1: 2.15:2.15:1.10 and the fluidity and retention capacity of cement paste are the best . On the basis of not affecting the application performance of concrete, the introduction of reduction group is helpful to improve the shrinkage performance of concrete.