特细砂混凝土二级界面微观结构研究  

Study on secondary interface microstructure of special fine sand concrete

作　　者：邵欣[1] 汪彭生 章环境 

机构地区：[1]成都理工大学工程技术学院,四川乐山6140071 [2]雅砻江流域水电开发有限公司,四川成都610051

出　　处：《人民长江》2014年第13期75-78,105,共5页Yangtze River

摘　　要：为探究特细砂配制的混凝土出现裂缝且强度降低的原因,配制了不同水灰比的特细砂混凝土并加工成电镜试样。通过电镜扫描及能谱分析来研究其二级界面微观结构,并分析水灰比的变化对二级界面微观结构的影响。结果表明:相对而言,水灰比偏低的混凝土二级界面微观结构更加均匀致密;不同水灰比的特细砂混凝土二级界面C-S-H的凝胶钙硅比不同,但变化不大;较低的水灰比可以改善特细砂混凝土二级界的微观结构。In order to research the reason of crack appearing and strength reduction of special fine sand concrete, several espe-cial fine sand concrete specimens with different water-cement ratios are prepared and processed into electron microscope sam-ples. According to scanning electron microscope and energy spectrum analysis, the influence of variation of water-cement ratio on secondary interface microstructure of concrete is analyzed. The research result shows that the secondary interface microstruc-ture of concrete with lower water-cement ratio is relatively more uniform and compact, moreover, the Ca/Si ratio of C-S-H gels in secondary interface is different in concrete with lower water-cement ratio, but change little.

关 键 词：二级界面 微观结构 钙硅比 特细砂混凝土 

分 类 号：TV431[水利工程—水工结构工程]