摘要
采用显微硬度仪测量经碳化28 d的再生混凝土不同界面的显微硬度,从而了解再生混凝土不同界面的显微硬度值及界面过渡区宽度的变化规律,通过比较确定同强度再生混凝土不同界面中的最薄弱界面以及同种界面显微硬度及其宽度与再生混凝土强度等级之间的关系,从微观层面揭示碳化反应对再生混凝土界面的作用机理。试验研究表明:经碳化28 d的同强度再生混凝土中,LG-XJ界面是最薄弱界面,LG-LJ界面次之,LJ-XJ界面是最优界面;经碳化28 d的再生混凝随着强度等级的提高,LG-XJ界面、LG-LJ界面、LJ-XJ界面都不同程度的加强,即界面的显微硬度值增加,过渡区宽度减小。
The micro hardness of different interface of recycled concrete is measured after 28 d carbonation by micro hardness instrument,in order to understand the change rule of recycled concrete with different interfacial micro hardness and the width of the interface transition zone,through compared to determine the weak interface between different concrete interface of the same strength recycled concrete and the relationship between interface micro hardness of recycled concrete strength grade,and reveal the mechanism of carbonation of recycled concrete interface from the micro level.Experimental study showed that LG-XJ interface is the weakest interface among interfaces of the same recycled aggregate concrete after 28 d carbonation,next is LG-LJ interface,the optimal interface is LJ-XJ.With recycled concrete 28 d carbonation increasing strength grade,LG-XJ interface,LG-LJ interface and LJ-XJ interface exist different degree of strengthening,that the interface micro hardness increases and the width of the transition region becomes smaller.
出处
《混凝土》
CAS
北大核心
2017年第7期15-17,21,共4页
Concrete
基金
国家自然科学基金项目资助(51378270
51578297)
山东省高校优秀科研创新团队计划资助
关键词
再生混凝土
多重界面
界面过渡区
显微硬度
碳化
recycled concrete
multiple interface
interfacial transition zone
micro hardness
carbonation
