对掺0%和0.2%聚丙烯纤维的C60高性能混凝土进行了模拟火灾高温试验,测试了高温前后混凝土的轴心抗压强度,采用红外热成像检测技术,研究了高温后混凝土的红外热像图谱.建立了高性能混凝土红外热像平均温升与受火温度和轴心抗压强度比的关系;对常温、300 ℃、400 ℃、500 ℃高温后高性能混凝土试件进行了CT图像扫描试验,分析纤维对混凝土内部裂纹产生和扩展的影响.
C60 high performance concrete with 0% and 0.2% polypropylene fiber were subjected to high temperature test of simulated fire.The uniaxial compressive strength of concrete were carried out before and after exposed to high temperature.Infrared thermography technique was used to study the infrared thermal image of concrete after high temperature.The relationship among the average temperature rise of infrared thermal image, the fire temperature and the ratio of uniaxial compressive strength was established.The CT scan test was conducted on the high-strength concrete specimens at room temperature and 300 ℃,400 ℃,500 ℃ respectively.The effect of fiber on crack generation and expansion in concrete was analyzed.
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