增稠剂掺量对PVA-ECC性能的影响  

Thickener dosage on properties of PVA-ECC

作　　者：郑银林[1] 马锋玲[1] 刘艳霞[1] 

机构地区：[1]中国水利水电科学研究院,北京100038

出　　处：《中国水利水电科学研究院学报》2012年第4期283-287,共5页Journal of China Institute of Water Resources and Hydropower Research

摘　　要：本文以聚乙烯醇(PVA)纤维为增强材料的ECC(Engineered Cementitious Composites)砂浆作为研究对象,采用不同掺量的增稠剂,通过砂浆轴向拉伸试验、抗压强度和抗折强度试验,来研究增稠剂掺量对PVA-ECC性能的影响。试验结果表明,增稠剂有明显的增稠和保水作用,合适的增稠剂掺量可以增加ECC砂浆的黏聚性,显著减轻砂浆的泌水,改善纤维在砂浆中的分散均匀性,从而消除纤维的结团现象。PVA体积掺量1%情况下,当增稠剂掺量为0.10%～0.15%时,PVA-ECC既具有较高的抗拉强度也具有较高的极限拉伸变形能力,能够较好的改善PVA-ECC的力学性能和变形性能。In this paper, experimental research was carried out on Engineered Cementitious Composites with polyvinyl alcohol （PVA） fiber. To study the effect of thickener on the properties of PVA-ECC, ECC mortar with different thickener dosage was prepared for uniaxial tensile tests, compressive strength tests and flexural strength tests. The test results showed that appropriate thickener dosage could obviously increase the cohesiveness and greatly reduce the bleeding of ECC mortar. On the other hand, the use of thickener effectively eliminated the balling of PVA fibers, and consequently improved the dispersible uniformity of PVA rivers in mortar. At a PVA volume fraction of 1%, ECC with a thickener dosage of 0.10%-0.15% has both higher tensile strength and larger deformability.

关 键 词：增稠剂 PVA-ECC 拉伸应变 

分 类 号：TV431[水利工程—水工结构工程]