不同聚合物乳液对水泥砂浆特性影响及作用机理

通过试验对比研究了苯丙聚合物乳液、丁苯乳液、VAE聚合物乳液、丙烯酸脂聚合物乳液对水泥砂浆工作性能、强度性能、抗渗性能等的影响。研究结果表明：聚合物乳液对水泥砂浆的减水作用明显，其中丁苯乳液的减水率高达36%；随着聚合物掺量的加大，聚合物改性水泥砂浆的凝结时间逐渐延长，其中苯丙乳液的缓凝效果最为明显；聚合物乳液的加入可显著提高水泥砂浆的抗折强度及折压比，从而降低了其脆性；掺加聚合物乳液能在一定程度上降低水泥砂浆的渗透性，其中丁苯乳液改性水泥砂浆的渗透性可提高至V级抗渗标准。

Influence of different polymer emulsion on characteristics of cement mortar and mechanism analysis

Based on tests,we compare the influence of styrene-acrylic polymer emulsion,butyl benzene latex,VAE polymer emulsion,acrylic polymer emulsion fat on working performance and anti-permeability strength performance of cement mortar.The results show that,polymer of cement mortars decreases water obviously and the butyl benzene latex decreases water as high as 36%;with increase of the mixed quantity of polymer,the initial set and final set time of polymer modified cement slurry gradually extend,and the styrene-acrylic latex shows the most obvious effect;the mixing of polymer cement mortar can significantly improve the flexural strength and the ratio of fold to compression,so as to reduce its brittleness.By adding polymer emulsion to a certain extent can lower the permeability of cement mortar,and the permeability of butyl benzene latex modified cement mortar can be improved to grade V standards.