用于低水胶比高强高性能混凝土的聚羧酸系高性能减水剂适用品种试验研究

摘要

随着现代高层、超高层建筑的发展，高强高性能混凝土已经成为众多建筑工程的选择。由于原材料选择、配合比设计原因，尤其是高强高性能混凝土制作时需采用低水胶比，拌合物往往较为粘稠，工作性能不佳，影响施工。文章选用了4个型号的聚羧酸系高性能减水剂，以倒置坍落度筒排空时间、坍落度、扩展度以及1.5小时经时变化作为衡量混凝土工作性能的指标，对采用本地区的常规原材料配制C80高强高性能混凝土的适用性进行了比较研究，结果表明，合适的剂种可明显改善混凝土工作性能，降低混凝土粘度，增加实用价值。%High strength concrete is becoming widely used with the development of modern architecture, while showing poorly workability with low water binder ratio and high cementing material content. In this paper, 4 type of poly carbox⁃ylic acid water reducing agent were used to make 80Mpa high strength concrete by local conventional raw materials, with measurement index of delivery time of inverted slump cone,slump flow, and 1.5h slump loss. As it is shown, better workability ,viscosity and practical value of high strength concrete were obtained by using suitable poly carboxylic acid water reducing agent.