S3级混凝土专用缓释型聚羧酸减水剂的制备及性能研究

Study on preparation and properties of slow-release type polycarboxylic superplasticizer for S3 concrete

将自制的具有双层分散结构的不饱和单体(D1)与马来酸酐、丙烯酸-2-羟基乙酯、丙烯酸-2-羟基丙酯及4-羟丁基乙烯基聚氧乙烯基醚共聚得到一种坍落度等级为S3级的混凝土专用缓释型聚羧酸减水剂(PTX)。试验结果表明,与常规缓释型聚羧酸减水剂相比,PTX的初始减水分散效果和保坍效果更优,适用于S3级混凝土的减水和保坍。

Unsaturated monomer(D1) with double-layer dispersion structure was prepared by esterification of maleic anhydride with p-hydroxybenzoic acid,and then copolymerized with maleic anhydride,2-hydroxyethyl acrylate,2-hydroxypropyl acrylate and 4-hydroxybutyl vinyl polyoxyethylene ether to obtain a special slow-release type polycarboxylic superplasticizer(PTX) for S3 concrete.The test results show that compared with conventional slow-release type polycarboxylic superplasticizer,PTX has better initial water-reducing and slump-retaining effect,and is more suitable for slump-retaining of S3 concrete.