高性能聚羧酸减缩材料的研发(Ⅲ)——高分子聚合物(HP-SRA)的作用机理

Development of high-performance polycarboxylic acid shrinkage-reducing materials (Ⅲ)——Action mechanism of high polymer (HP-SRA)

摘要:

选择自行研发的高分子聚合物(HP-SRA)与Eclipse-Floor减缩剂(Eclipse-SRA) 2种减缩材料，通过对比，探讨了高分子聚合物(HP-SRA)的作用机理。结果表明：在优化分子结构设计的基础上，高分子聚合物(HP-SRA)通过降低在水泥颗粒表面上的平均吸附率、溶液表面张力和蒸发速率、提高溶液动力黏度、改善孔结构分布来提高其减缩能力；同时，通过提高水泥净浆初始流动度和降低经时损失来提高其分散能力，从而实现了减缩与高分散多功能化的统一。

Abstract:

In order to explore the action mechanism of high polymer (HP-SRA) by comparison, the self-made high polymer (HP-SRA) and Eclipse-Floor shrinkage reducing admixture (Eclipse-SRA) were selected as two shrinkage-reducing materials. The results indicate that the shrinkage reducing ability is improved through reducing the average adsorption rate of high polymer (HP-SRA) on the surface of cement particles, the surface tension and the evaporation of pore solution, and through improving the kinematic viscosity of pore solution and the distribution of capillary structure of cement. Meanwhile, The dispersion ability is improved through improving the initial fluidity cement paste, and the fluidity had nearly no loss after 1 h. The unity of shrinkage-reducing and dispersing performance is achieved.