【摘要】 根据分子结构设计原理,设计并以水为溶剂合成了一种以甲氧基聚乙二醇(MPEG)为接枝侧链的聚羧酸系高效减水剂(PC-C)。论文采用红外光谱表征PC-C的分子结构,采用表面张力、净浆流动度、混凝土减水率和强度等方法,研究了含MPEG侧链聚羧酸系高效减水剂PC-C的性能。结果表明:PC-C的分子结构上成功引入了MPEG侧链;PC-C不明显降低水溶液的表面张力;与水泥适应性良好;对水泥的分散性能高,分散性的保持能力随掺量的增加而得以提高;以及PC-C的减水率高,对混凝土有较好的增强作用。更多还原

【Abstract】 A polycarboxylic superplasticizer(PC-C) grafted with MPEG side chains was designed according to principle of molecular structure and synthesized in water as solvent.The molecular structure of PC-C was characterized by IR and performance of PC-C studied by means of surface tension,fluidity of cement paste,water reducing ratio and strength of concrete and some other methods.Testing results indicated that MPEG side chains were introduced into molecular structure of PC-C,PC-C didn’t obviously reduce surface tension of water solution,showed good adaptability to cement,high dispersion for cement,dispersive retention improved with increase of dosage,had a high water reduction and rendered better strength to concrete.更多还原