高温后活性粉末混凝土SHPB试验研究  

Experimental Study on Impact Properties of Reactive Powder Concrete Using SHPB after Exposure in High Temperature

作　　者：庞宝君[1] 王立闻[1,2] 陈勇[1] 林敏[1] 张凯[1] 王少恒[1] 

机构地区：[1]哈尔滨工业大学空间碎片高速撞击研究中心,黑龙江哈尔滨150080 [2]中国东方电气集团有限公司,四川成都611731

出　　处：《建筑材料学报》2012年第3期317-321,共5页Journal of Building Materials

基　　金：国家空间碎片专题研究基金项目(kjsp06211)

摘　　要：利用分离式Hopkinson压杆(SHPB)系统,采用铅片作为整形器,分别对常温下及400,600,800℃高温过火后的活性粉末混凝土(RPC)试样进行单轴冲击压缩试验,研究应变率及温度对RPC材料动态力学性能及变形破坏特性的影响规律.结果表明:常温下及高温过火后,RPC材料的动态抗压强度、破碎程度及吸收能量均具有明显的应变率效应,而峰值应变、初始弹性模量及能量吸收率的应变率相关性较弱,且温度对应变率效应没有明显影响;高温过火后,不同应变率下RPC材料的动态抗压强度、初始弹性模量及能量吸收率均有所降低,而峰值应变增大.Uniaxial-compression split Hopkinson pressure bar（SHPB） experiments with lead flakes as pulse shapers were performed for reactive powder concrete（RPC） samples. Both the untreated concrete speci-mens and the specimens after exposure in high temperature （400,600,800 ℃） were tested in order to in-vestigate the influences of strain rate and temperature on dynamic mechanical behavior, deformation prop- erties and failure of RPC concrete. The results show that the dynamic compressive strength, fracture de-gree and energy absorption of RPC exhibit remarkable strain rate sensitivity both at room temperature and after exposure in high temperature. However, strain rate has little effect on peak strain, initial Young modulus or energy absorbency. And there are few influences of temperature on strain rate effect. It is also found that dynamic compressive strength, initial Young modulus and energy absorbency at different strain rate all decrease after exposure in high temperature while peak strain increases.

关 键 词：活性粉末混凝土 分离式HOPKINSON压杆 高温过火 动态力学性能 能量吸收率 

分 类 号：TU501[建筑科学—建筑技术科学]