高温后全轻混凝土性能及其微观分析  

The Light-Wide Concrete Performance and Its Microscopic Analysis after High Temperature

作　　者：周茗如[1] 孙庆霞[1] 曹万智[1,2] 薛海儒 乔宏霞[1] 

机构地区：[1]兰州理工大学土木工程学院,兰州730050 [2]西北民族大学土木工程学院,兰州730124 [3]中铁十局,济南250117

出　　处：《建筑科学》2009年第9期30-33,37,共5页Building Science

基　　金：甘肃省自然科学基金项目(2007GS04093);甘肃省建设科技攻关项目(JK2007-11);兰州理工大学博士启动基金(SB04200803)

摘　　要：对全轻混凝土进行耐高温试验,研究了其经过各个温度段后残余强度、外观特征及质量损失。并利用带有X射线能量色散谱议的电子显微镜(SEM-EDAX)研究了全轻混凝土的水化产物、显微结构。结果表明:全轻混凝土残余强度曲线总体呈下降趋势,且较平缓;并发现全轻混凝土的显微结构在受热后会产生一系列变化,这些变化可以用来解释高温后混凝土性能指标发生变化的原因。为全轻混凝土在高温环境下的应用提供技术依据。Based on the high temperature tests of the light-wide concrete, the residual strength, the appearance of features and the quality loss after its various temperatures are studied, and the hydration products and microstructure of the light-wide concrete are further studied with the electron microscope installed with X-ray energy dispersive spectrum instrument （SEM-EDAX）. The results show that the residual strength curve of the light-wide concrete has overall downward trend, but gentle. And the microstructure of the light-wide concrete has a series of changes after the heat. These changes can be used to explain changes of the concrete performance indexes after the high temperature. The paper can provide technical basis for application of the light-wide concrete in high-temperature environment.

关 键 词：全轻混凝土 高温 残余强度 扫描电镜 微观结构 

分 类 号：TU528.2[建筑科学—建筑技术科学] TU528.34