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高温后活性粉末混凝土shpb试验研究-庞宝君.pdf


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建 筑 材 料 学 报
第15卷第3期 Vol.15hao-heng1
(1.Hypervelocity Impact Research Center,Harbin Institute of Technology,Harbin 150080,China;
2.Dongfang Electric Corporation,Chengdu 611731,China)
Abstract: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.
Key words:reactive powder concrete(RPC);split Hopkinson pressur

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