摘要
以自制的高性能聚羧酸混凝土减缩材料(SRA-PC)为水泥基材料外加剂,通过对水泥净浆流动度的测试,探讨了高性能聚羧酸混凝土减缩材料的分散机理,证明高性能聚羧酸混凝土减缩材料具有良好的分散性能。通过测定水泥颗粒吸附行为、溶液表面张力、溶液蒸发速率、溶液动力黏度和孔结构分布,重点分析了高性能聚羧酸混凝土减缩材料的减缩机理。结果表明:有92.63%的高性能聚羧酸混凝土减缩材料溶解在溶液中,溶解在溶液中的高性能聚羧酸混凝土减缩材料能够有效降低溶液表面张力和蒸发速率,提高溶液黏度,改善水泥石孔结构分布。高性能聚羧酸混凝土减缩材料的减缩机理是:通过溶解在溶液中的高性能聚羧酸混凝土减缩材料降低溶液表面张力,从而减少了水泥基材料产生收缩的驱动力;此外还通过溶解在溶液中的高性能聚羧酸混凝土减缩材料降低溶液蒸发速率,提高溶液黏度,改善孔结构分布,从而保证了高性能聚羧酸混凝土减缩材料具有优异的减缩性能。
The self-made high-performance polycarboxylic acid shrinkage-reducing materials( SRA-PC) is selected as the admixture of cement based materials. The dispersing mechanism of SRA-PC is explored by a test of fluidity of cement paste,and the good dispersing performance of SRA-PC is determined. The adsorption behavior of cement particles,surface tension,evaporation rate,and kinematic viscosity of solution,and distribution of capillary structure of cement are measured,and the shrinkage-reducing mechanism of SRA-PC is analyzed emphatically. The results show that the average adsorption rate of SRA-PC in solution is 92. 63%. The SRA-PC can reduce the surface tension and evaporation rate of solution,and improve the kinematic viscosity of solution and distribution of capillary structure of cement. The shrinkage-reducing mechanism of SRA-PC can be considered as the fact that the shrinkage-reducing of cement based materials is resulted from SRA-PC leading to significant reduction of surface tension of solution.Meanwhile,the SRA-PC reduces the evaporation rate of solution,and can improve the kinematic viscosity of solutionand distribution of capillary structure of cement. The excellent shrinkage-reducing performance of SRA-PC is ensured.
出处
《江南大学学报（自然科学版）》
CAS
2015年第4期454-459,共6页
Joural of Jiangnan University (Natural Science Edition)
基金
福建省教育厅A类科技计划项目(JA11329
JA12412)
泉州市科技计划重点项目(2013Z158
2013Z47
2010G7)
关键词
高性能聚羧酸混凝土减缩材料
水泥基材料
作用机理
分散性能
减缩性能
high-performance polycarboxylic acidshrinkage-reducing materials(SRA-PC),cement-based materials,action mechanism,dispersing perf
