Research of infrared radiation characteristics of concrete deformation and failure
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摘要: 对混凝土试样进行单轴压缩实验，利用红外热像仪和声发射仪，测试并研究了加载过程中试样的红外辐射与声发射变化特征。研究结果表明：混凝土试样受载破坏过程中红外辐射温度曲线呈典型的降转升型，试样发生破坏时，平均红外辐射温度的增温幅度为0.15 ℃，最高红外辐射温度的增温幅度为1.05 ℃；平均红外辐射温度在试样破坏前有明显前兆特征，载荷比为66.7%时温度快速下降，载荷比为82.6%时温度上升；在混凝土试样破裂及其发展阶段，红外热像上出现高温条带和低温条带，高温条带处于2个破裂面的错动摩擦区域，而低温条带和试样表面的裂缝对应，处于张性破裂区域。混凝土变形破坏的红外辐射演化特征为监测混凝土工程受力破坏提供了一种新方法。Abstract: Uniaxial compression test was conducted on concrete samples, and change characteristics of infrared radiation and acoustic emission of the samples in loading process were tested and studied by use of infrared imager and acoustic emission instrument. The research results show that infrared radiation temperature curve presents decreasing firstly and then increasing in the loaded concrete samples failure process, and temperature increasing amplitude of average infrared radiation temperature and the maximum infrared radiation temperature are respectively 0.15 ℃ and 1.05 ℃ when the samples failure. Before the samples failure, the average infrared radiation temperature has obvious precursor information that the temperature quickly drops at 66.7% load ratio and rises at 82.6% load ratio. During stage of the concrete samples fracture and its development, low and high temperature bands appear on infrared images, the high temperature bands appear in friction area of two fracture surfaces, as well as the low temperature bands are corresponding with sample cracks which are in tension fracture zone. Infrared radiation evolution characteristics of concrete deformation and failure provide a new method for concrete engineering destruction monitoring.
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