有机胺改性聚羧酸系高性能减水剂的试验研究

摘要

The paper studies four kinds of organic amine modification of organic amine polycarboxylic acid water-reducing agent,and optimizes optimal modified technologies. Results show that:modified high-performance organic amine polycarboxylic acid water-reducing agent A can re-lease the cement depressiveness,the modified high-performance organic amine polycarboxylic acid water-reducing agent B,C and D can greatly improve the cement depressiveness especially for poor water-reducing agent,the modified high-performance organic amine polycarboxylic acid wa-ter-reducing agent has basically coordination for concrete rheological behavior and cement cleaning flowing law as well.%对四种聚羧酸系高性能减水剂进行了有机胺改性研究，优化出最佳改性工艺，并从分子链结构搭配的角度分析了有机胺的改性机理，结果表明：改性后的聚羧酸系高性能减水剂A对水泥的分散性能仅起到抵消缓释作用，聚羧酸系高性能减水剂B，C， D改性后对水泥的分散性能有很大的提高，尤其是对保坍性能较差的减水剂，改性后的减水剂对混凝土的流变性能与水泥净浆流动度的变化规律基本一致。