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《Journal of Vibration and Shock》 2018-12
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An experimental study on microstructure of high-strength concrete after high temperature and uniaxial compressive fatigue

ZHAO Dongfu;JIA Penghe;LIU Huixuan;GAO Haijing;LIU Yuchen;Beijing Higher Institution Engineering Research Center of Civil Engineering Structure and Renewable Material,Beijing University of Civil Engineering and Architecture;School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture;Beijing Collaborative Innovation Center of Energy Conservation and Emission Reduction Technology;Beijing Advanced Innovation Center for Future Urban Design;  
The microstructure of high-strength concrete( HSC) after high temperature and uniaxial compression fatigue was studied by using ultrasonic,micro-hardness test and mercury intrusion porosimetry( MIP). The variation law of microstructure during uniaxial compressive fatigue was compared and analyzed by measuring sonic time and amplitude,micro-hardness,pore size distribution and cumulative pore volume. The relationship between fatigue residual strain and sonic time,micro-hardness was established. Both the dynamic evolution process and damage mechanism of microstructure of HSC during uniaxial compressive fatigue after high temperature were further investiaged. The results show that the sonic time tends to increase,while the amplitude and micro-hardness decrease with the relative fatigue cycles. The most probable pore size,the total pore volume and the harmful pores( pore diameter 50 nm) tend to increase significantly.The variations of the parameters show almost fast-slow-fast trend and also show obvious three-stage variation. At the same life ratio,the fatigue damage caused by the lower stress level is greater than the higher stress level during uniaxial compressive fatigue of HSC after high temperature. The research results provide reference for nondestructive testing,fatigue damage analysis,structure assessment suffered from fire or other high temperature process.
【Fund】: 国家自然科学基金(51378045)
【CateGory Index】: TU37
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