（1 湖南大学土木工程学院，长沙 410082;2 湖南固特邦土木技术发展有限公司，长沙 410205）

[摘要]  研究了不同水性环氧树脂对改性水泥砂浆强度的影响，考察了水性环氧种类、聚合物掺量变化和稀释剂对改性水泥砂浆性能的影响，使用SEM、激光粒径分析和表面张力测定等手段对水性环氧改性机理进行了分析。研究结果表明，聚胶比为15%时水性环氧改性砂浆强度可满足潮湿界面结构加固用聚合物砂浆的要求；复合活性稀释剂可有效改善砂浆的工作性和可使用时间，明显提高砂浆的韧性，当稀释剂相对环氧树脂外掺14%时，抗折强度比未掺稀释剂时提高63%，达到20.4MPa。

[关键词]  水性环氧；改性砂浆；潮湿界面粘结；结构加固

中图分类号：TU57+8.12     文献标识码：A         文章编号：      

*长沙市重大科技专项资助项目（K1204010-31）。

作者简介：彭勃，博士，教授，Email: pungbo@sina.com。

Study on epoxy modified cement mortar for use in wet interface structural strengthening

Peng Bo¹, Mei Shipeng¹, Shan Yuanming², Tian Tian²

(1 Civil Engineering College of Hunan University, Changsha 410082, China;

2 Hunan Goodbond Construction Technic Development Co., Ltd., Changsha 410205, China)

Abstract: The influences of different waterborne epoxy products on the strength of polymer modified cement mortar were studied. This study focused on the performance of epoxy modified mortar with different waterborne epoxy types, different epoxy dosages and different diluents dosages. SEM, laser particle size analyzer and surface tension meter were used to analyze the function and mechanism of waterborne epoxy in cement mortar. The results show that strength properties can meet the requirements of wet interface structural strengthening polymer modified mortar when polymer-binder ratio is increased to 15%. Reactive diluents will improve the workability and increase the amount of time before initial setting, as well as improve the toughness of modified mortar. The flexural strength of modified mortar with diluents outer dosage of 14% can reach 20.4MPa, an increase of 63% compared to modify mortar without diluents.

Keywords: waterborne epoxy; modified mortar; wet interface bonding; structural strengthening

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