环氧树脂乳液改性水泥基水下修补砂浆的制备与

关键字：环氧树脂乳液,硫铝酸盐水泥,修补砂浆,水下抗分

（1.南水北调工程设计管理中心，北京  100038；2.武汉理工大学 材料科学与工程学院，湖北 武汉  430070）

    摘要：采用环氧树脂乳液对硫铝酸盐水泥基水下修补砂浆进行改性，研究了聚灰比对修补砂浆凝结时间、水下分散性和抗折粘结性能的影响，并通过扫描电镜（SEM）观察了环氧树脂乳液改性砂浆的微观结构。结果表明：随着聚灰比的增大，砂浆凝结时间延长；聚灰比为0.1以内时，硫铝酸盐水泥基修补砂浆的水下抗分散性增强、抗折粘结强度大幅度提高，而继续增大聚灰比，抗折粘结强度反而降低。SEM观察表明，环氧树脂可在水泥水化产物和砂粒表面形成连续的聚合物膜，但环氧树脂乳液掺量过大（聚灰比为0.2）时，形成的聚合物膜过厚，反而降低了砂浆与旧基层的粘结性。
    关键词：环氧树脂乳液；硫铝酸盐水泥；修补砂浆；水下抗分散性；粘结强度
    中图分类号：TU57+8.11        文献标识码：A            文章编号：1001-702X（2017）05-0033-03

Preparation and performance of repair cement mortar modified by epoxy resin emulsion
ZHONG Huirong1，JIANG Chengcheng2，ZHA Yagang2，YU Jianying2，YAN Shilin2
（1.Administration Center for Design of the South-to-North Water Diversion Project，Beijing 100038，China；2.School of Material Science and Engineering of Wuhan University of Technology，Wuhan 430070，China）

    Abstract：Sulphoaluminate cement repair mortar was modified by epoxy resin emulsion. Effects of the ratio of polymer to cement on setting time，non-dispersion underwater and flexural bond strength was investigated and the microstructure of epoxy resin emulsion modified mortar was observed by scanning electron microscope（SEM）. It was showed that setting time of the modified mortar increased with the increase of the ratio of polymer to cement. Non-dispersion underwater and the flexural bond strength of the repair mortar based with sulphoaluminate cement is greatly increased when the ratio of polymer to cement is not more than 0.1，but when the ratio of polymer to cement was increased regularly，flexural bond strength decreased. SEM observation showed that epoxy resin can form a continuous polymer film in the cement hydration products and sand surface， however，when the ratio of polymer to cement reached 0.2，the polymer film formed is too thick，which affects the bonding strength between the repair mortar and the old base.
    Key words：epoxy resin emulsion，sulphoaluminate cement，repair mortar，non-dispersive underwater，bonding strength