高性能聚羧酸减缩材料的研发(Ⅳ)——高分子聚合物(HP-SRA)对泵送混凝土性能的综合评价

Development of High-performance Polycarboxylic Acid Shrinkage-reducing Materials (Ⅳ)——Integrative Estimate of High Polymer (HP-SRA) on Performance of Pumping Concrete

摘要:

通过对比研究了高分子聚合物(HP-SRA)对泵送混凝土拌合物的工作性能、力学性能、体积稳定性、早龄期开裂性能和抗氯离子渗透性能的影响。结果表明：HP-SRA在泵送混凝土拌合物中具有良好的减水效果和保坍性能；HP-SRA的添加对泵送混凝土的抗压强度、抗折强度和劈裂抗拉强度不会产生不利影响；HP-SRA对泵送混凝土的干燥收缩和早龄期自收缩具有抑制作用，能大幅提高或有效改善泵送混凝土的早龄期抗裂性能和抗氯离子渗透性能。

Abstract:

The influence of high polymer (HP-SRA) on workability, mechanical property, volumestability, early-age cracking performance and chloride ion diffusivity of pumping concrete are comparatively investigated. The results show that HP-SRA has better water-reducing effect and slump in pumping concrete mixture. HP-SRA hasn’t a certain negative effect on the compressive strength, flexural strength and spliting strength of pumping concrete. HP-SRA can obvoiously reduce the drying shrinkage and early-age autogenous shrinkage of pumping concrete, and early-age crack resistance and chloride ion diffusivity of pumping concrete are reinforced drastically or improved efficiently.