Microstructural Changes of High Strength Concrete during Low Cycle Compression Fatigue Test after Exposure to High Temperature

Using ultrasonic detection, microhardness test, scanning electron microscope mercury intrusion method and X-ray diffraction, the parameters of sonic time, microhardness, pore size distribution, cumulative pumping high strength concrete under low cycle compression loading are tested after exposure to 200 °C, 400 °C 600 °C. Experimental study showed that with increasing times, rangeability total volume shows an overall trend fast-slow-fast. Furthermore, time linearly related longitudinal fatigue strain. The research results provided references for nondestructive testing, damage analysis structural evaluation structures subjected fire or other temperature processes.