Microcrack detection tests of thermal damage concrete based on nonlinear ultrasonic technology

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (5) : 126-135.

XU Ying, ZHANG Heyong, WANG Qingyuan

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Abstract

Micro-cracks are easy to form in concrete structure after heating or fire, which will seriously affect the durability and strength of concrete. Based on the theory of nonlinear acoustic field modulation, the side band peak counting method and the concept of damage index are proposed to evaluate the development of thermal damaged concrete micro-cracks. Through the preparation of heat damaged concrete at high temperature, the detection results of micro-cracks in heat damaged concrete show that the damage index will increase with the development of micro-cracks, which is consistent with the theoretical research. The feasibility of the nonlinear field modulation method is proved, and the advantages of the modulation method are analyzed by introducing the nonlinear field resonance method for comparative experiments. It is found that the peak value of damage index will increase with the increase of water cement ratio or aggregate ratio of concrete, and the damage index peak value of concrete will increase with the increase of water cement ratio or aggregate ratio of concrete, and the damage index peak value of concrete will increase with the increase of water cement ratio or aggregate ratio of concrete, and the relationship between residual strength and damage index peak value will be established for the evaluation of thermal damage of concrete materials fixed foundation.

Key words

nondestructive testing / nonlinear field modulation / nonlinear field resonance / heat damaged concrete / micro-crack / residual strength

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XU Ying, ZHANG Heyong, WANG Qingyuan. Microcrack detection tests of thermal damage concrete based on nonlinear ultrasonic technology[J]. Journal of Vibration and Shock, 2021, 40(5): 126-135

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