复合胶凝体系超高性能修复材料韧性及微细观特征研究  

Study on toughness and microstructure characteristics of super high performance composite cementitious repair materials

作　　者：谢文 胡业红 樊磊 谢靖斌 田峰 邹烽 秦公义 崔圣爱[3] XIE Wen;HU Yehong;FAN Lei;XIE Jingbin;TIAN Feng;ZOU Feng;QIN Gongyi;CUI Sheng′ai(China Nuclear Huachen Construction Engineering Co.,Ltd.,Xi′an 710000,China;Bureau of Geology and Mineral Exploration and Development Guizhou Province 106 Geological Brigade,Zunyi 563000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中核华辰建筑工程有限公司,陕西西安710000 [2]贵州省地质矿产勘查开发局一○六地质大队,贵州遵义563000 [3]西南交通大学,四川成都610031

出　　处：《混凝土》2025年第3期102-107,共6页Concrete

基　　金：国家自然科学基金(52278277)。

摘　　要：为探究复合胶凝体系对超高性能修复材料韧性及微细观特征的影响,设计水泥单一胶凝体系、水泥-硅灰二元胶凝体系和水泥-微珠-硅灰三元胶凝体系进行探索.通过物理力学性能试验,研究不同胶凝体系对超高性能修复材料工作性能、力学性能和韧性行为的影响,并结合扫描电镜及CT技术从微观角度解释其作用机理.研究结果表明:硅灰和微珠均显著提高混凝土的力学性能,且微珠可以补偿硅灰对流动性的不利影响.工作性结果、折压比及残余弯曲韧度比表现出的规律一致:C-CS-SF组优于C组优于C-SF组;SEM-EDS结果表明多元胶凝体系生成的水化产物Ca/Si低,C-S-H凝胶更为致密,基体与钢纤维的黏结更为紧密;CT结果表明水泥-微珠-硅灰三元胶凝体系总孔隙率低,密实度最高,钢纤维定向程度高。In order to explore the influence of composite cementitious system on the mechanical properties and microstructure of super high performance composite cementitious repair materials.The cement single cementitious system,the cement-silica fume cementitious system and the cement-cenosphere-silica fume cementitious system were designed.The effects of different cementitious systems on the working properties,mechanical properties and toughness were compared through physical and mechanical property tests,and the mechanism of action was explained from a microscopic perspective by combining scanning electron microscopy and CT technology.The research results show that the mechanical properties of concrete can be improved by adding silica fume and cenosphere,and the addition of cenosphere can compensate for the adverse effects of silica fume on the fluidity.The results of workability,folding pressure ratio and residual bending toughness ratio are consistent:C-CS-SF group is better than C group,C group is better than C-SF group.SEM-EDS results show that the hydration product Ca/Si produced by the multi-component cementitious system is lower,the C-S-H gel isdenser,and the bond between the matrix and the steel fiber is closer.CT results show that the cement-cenosphere-silica fume ternary cementitious system has low total porosity,the highest density,and high degree of orientation of steel fiber.

关 键 词：超高性能修复材料 复合胶凝体系 力学性能 微观结构 作用机理 

分 类 号：TU528.041[建筑科学—建筑技术科学]