PCA对低水灰比砂浆抗硫酸盐侵蚀的影响

Effects of PCA on Sulfate Attack Resistance of Mortar with Low w/c

以不同含量C3A和CaCO3的水泥以及不同的高效减水剂为原材料,对低水胶比水泥砂浆在硫酸盐环境下的抗压和抗折抗蚀系数等进行测试,研究了不同水泥成分条件下,丙烯酸类聚羧酸PCA—Ⅰ减水剂和马来酸类聚羧酸PCA—Ⅱ减水剂对低水灰比砂浆抗硫酸盐侵蚀性能的影响。结果表明,根据水泥矿物组成和C3A含量,合理确定聚羧酸减水剂品种,掺聚羧酸减水剂的低水灰比水泥砂浆具有良好的抗硫酸盐侵蚀性能。

Different kinds of superplasticizers and cement with different content of C3 A and CaCO3 and are used as raw materials. The compressive strength and flexural strength of cement mortar with low water-cement ratio are measured. And the influence of acrylic acid-type polycarboxylate admixture （ PCA-- I ） and maleic acid-type polycarboxylate admixture （PCA--II ） on sulfate resistance of cement mortar under different cementitious content were studied. The results show that optical polycarboxylate admixture should be chosen according to the mineral eompostion and the C3 A content of cement, thus low water-cement ratio cement mortar with polycarboxylate admix- ture added in showed better sulfate resistance.