Research on visualization of concrete crack depth detection based on tracer electromagnetic method

The invisibility of concrete cracks due to their expansion to the inside has resulted in no effective crack depth detection technology to date. The traditional concrete crack depth detection methods have the problems of insufficient accuracy and low detection efficiency. To solve these problems, this paper proposes a new concrete crack depth detection method based on the combination of tracer and hand-held radar. The method uses tracer diffusion to the bottom of the crack propagation, and then maps the location of the air-tracer interface by radar waves, thus visualizing the crack depth information. This paper elaborates the detection principle of this new method, conducts numerical analysis and simulation to verify the feasibility, makes standard concrete crack specimen, carries out relevant experimental studies, selects distilled water and saturated NaCl solution as tracer to verify the feasibility of the method, and compares and analyzes the detection effect of these two tracers by comparing the experimental test data with the actual depth of the specimen.