针对C60,C70两种混凝土进行了受火模拟试验,采用红外热像法与超声回弹法对混凝土的损伤进行了检测,验证了这两种方法的可行性与特点,并探究了红外热像法及超声回弹法作为相互补充的方法检测混凝土受火后损伤程度的可行性.试验发现:混凝土的受火温度和剩余抗压强度有着很强的相关性,受火温度可以作为混凝土损伤程度的判定指标.红外热像法测得的混凝土表面的平均温度升高值与受火温度,以及超声回弹法测得的声波平均速度与受火温度、回弹值与剩余抗压强度都有极好的相关性.同时由于受火温度的不同,两种检测方法适用的情况也有所不同.%A fire simulated experiment were conducted on two types of concrete(C60 and C70).The damage of concrete was assessed by infrared thermography and ultrasonic rebound methods to verify the feasibility and characteristics of these two methods.The results show that the maximum temperature that the concrete experienced has strong correlation with the residual strength.Therefore,the maximum fire temperature can be used as an indicator to determine the concrete damage degree.On the other hand,the average temperature increase of concrete surface measured by infrared thermography has an excellent correlation with the maximum fire temperature.The average velocity of sound wave measured by ultrasonic rebound method as well as the rebound value with residual strength have good correlation with the maximum fire temperature.Due to the different indicators,these two methods are suitable for different situations.
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