Abstract
Previous researchers have shown that the surface wave transmission coefficient across a surface breaking crack in concrete can be used to estimate the depth of the crack. This study is the first to investigate a fully non-contact ultrasonic technique using air-coupled transducers which can reliably measure the surface wave transmission coefficient across a surface breaking crack in concrete. Using this setup, the transmission coefficient of Rayleigh surface waves is measured for three notches with different depths (0.5, 1, and 2 cm). Then, the relationship between the transmission coefficient and the normalized notch depth is experimentally reconstructed and compared with analytical and numerical results. It is demonstrated that the proposed fully non-contact technique is efficient and promising as a field application in civil infrastructure. The advantages of the proposed non-contact technique compared to existing methods are also discussed.
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