1 Spectral Differences Between Two Acoustic Imaging Methods for the in-situ Evaluation of Surface-Breaking Cracks in Asphalt M Iodice, J M Muggleton and E Rustighi Institute of Sound and Vibration Research, University of Southampton; Southampton, United Kingdom E_mail: michele.iodice@gmail.com Tel. No.: +44(0)7767715748 Abstract: The assessment of the location and the extension of cracks in roads is important for determining the potential level of deterioration in the road overall and in the infrastructure buried beneath it. Damage in a pavement structure is usually initiated in the tarmac layers, making Rayleigh waves ideally suited for the detection of shallow surface defects. Assessment of crack in roads is usually performed assuming constant velocity and non-dispersive behaviour of the material tested, limiting this approach to the very shallow layer of the road. In this work, differences between the spectral images obtained with the Multichannel Analysis of Surface Waves (MASW) and the Multiple Impact of Surface Waves (MISW) are exploited for the first time to detect, locate and evaluate
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