A new type of polycarboxylate superplasticizer (PC2) was synthesized by using the carboxymethyl starch ether (CMS-Na) to replace part of isopentenyl polyoxyethylene ether (TPEG).The best substitute of CMS-Na for TPEG was obtained by single component test of cement paste,which was 15％.In addition,the molecular structure of CMS-Na and polycarboxylate superplasticizer was characterized by infrared spectroscopy (FTIR).The results showed that PC2 not only reduced the cost of raw materials,but also had excellent dispersion and plastic preservation abilities,while do no harm to the compressive strength of concrete.%选取经过降解处理的羧甲基淀粉醚(CMS-Na)代替部分异戊烯基聚氧乙烯醚(TPEG)制备一种新型聚羧酸系减水剂(PC2),利用水泥净浆单组分试验得出CMS-Na对TPEG的最佳替代量为15％.另外,用红外光谱(FTIR)对CMS-Na及聚羧酸减水剂的分子结构进行了表征.结果表明,掺加CMS-Na合成的PC2不仅降低了原材料的成本,而且具有良好的分散性和保塑性,同时不影响混凝土强度.
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