Damage Detection and Optimization of Concrete Structure Based on Acoustic Emission Technology

Abstract

Concrete material is a cement-based material widely used in various projects. Under the load, the concrete structure will be damaged to produce cracks. Therefore, it is very necessary to accurately locate the damage point during detection. Acoustic emission (AE), as a nondestructive testing technology that monitors concrete damage, can be used to record and analyze the transmitted acoustic signal through a sensor so as to determine the source of the wave. Time difference location method is a commonly used sound source location algorithm at present. It regards the propagation of sound wave in concrete as a fixed value and does not consider the effect of acoustic wave attenuation, resulting in poor positioning accuracy. Resulting in poor accuracy of location point. This paper firstly introduces the principle of time difference positioning method. Following that, an analysis and summary of the influence on the water-cement ratio, sand rate, including aggregate particle the magnitude of sound wave attenuation is provided. The existence of acoustic attenuation is verified by the designed test scheme, and the optimization algorithm is obtained by using exhaustion method and interval dichotomy method. Compared with the time difference localization method, this algorithm can locate the damage point more accurately.