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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Acknowledgments
This work is supported by the German Academic Exchange Service (DAAD) through a Graduate Research Assistantship for Fabian Schempp. Additional funding has been provided by the Electric Power Research Institute (EPRI).
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In, CW., Schempp, F., Kim, JY. et al. A Fully Non-contact, Air-Coupled Ultrasonic Measurement of Surface Breaking Cracks in Concrete. J Nondestruct Eval 34, 272 (2015). https://doi.org/10.1007/s10921-014-0272-6
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DOI: https://doi.org/10.1007/s10921-014-0272-6