水凝胶复合水泥基材料性能与微结构特征  

Properties and Microstructure Characterization of Hydrogel Incorporated Cementitious Materials

作　　者：吴凯[1,2] 韩好 汪琪 胡源 徐玲琳[1,2] 高云[3] WU Kai;HAN Hao;WANG Qi;HU Yuan;XU Linglin;GAO Yun(Key Laboratory of Advanced Civil Engineering Materials,Ministry of Education,Tongji University,Shanghai 201804,China;School of Materials Science and Engineering,Tongji University,Shanghai 201804,China;School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]同济大学先进土木工程材料教育部重点实验室 [2]同济大学材料科学与工程学院,上海201804 [3]东南大学材料科学与工程学院,南京211189

出　　处：《硅酸盐学报》2021年第11期2470-2477,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(51978505,52078123);上海市青年科技启明星计划(20QC1400600)。

摘　　要：借助纤维素/聚乙烯醇(PVA)水凝胶对温度变化的响应特性,可缓解由正负温变化导致的水泥基材料损伤破坏。在分析纤维素/PVA对水泥基材料流动性、冻融循环前后力学性能影响基础上,研究了水凝胶复合水泥基材料水化产物、孔、裂缝等微结构特征。结果表明:纤维素/PVA溶液提高了水泥浆体的流动度;经冻融循环的纤维素/PVA溶液形成了交联网络状结构,提高了水泥基复合材料的总孔隙率,但有效缓解由于冻融循环作用而导致的强度下降和损伤。The temperature response features of cellulose/polyvinyl alcohol(PVA) hydrogel possess a potential of mitigating the damage of cementitious materials caused by frozen attack. The influence of cellulose/PVA solution on the fluidity, mechanical properties after freezing and thawing attack was evaluated. The hydration products, pore structure, cracks patterns of the composites were determined. The results show that using cellulose/PVA solution can enhance the fluidity of cement paste. A cross-linked network appears after applying a freeze-thaw cycling on the cellulose/PVA solution. The porous structure of cellulose/PVA hydrogel improves the total porosity of cement-based composites, but alleviates the compressive strength loss and the microstructure damage caused by freezing-thawing attacks.

关 键 词：水凝胶 水泥基复合材料 冻融循环 微结构 

分 类 号：TQ172[化学工程—水泥工业]