As a new nondestructive testing technology,the impact image method can detect the highway repaired effectively by grouting,and it is economical and convenient.In relation to the disease and grouting repair situation of S225 east section expressway in Nantong city of Jiangsu province,The response waveform before and after grouting is measured by the impact image method,and the low-frequency elastic wave signal is obtained by using high-quality excitation hammer.Based on the response waveforms reflected on different media surfaces,the void cracks of highway before and after grouting are quantitatively and visually analyzed.
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