Abstract
Spectral Analysis of Surface Wave (SASW) testing was used to evaluate an improvement in the source generation repeatability of surface waves when a sheet metal couplant strip was used compared to the exposed asphalt surface, plus the increase in maximum coherent frequency achieved using a wire spring impactor compared to a solenoid driven steel striker plate. Both SASW and Multichannel Analysis of Surface Waves (MASW) were used to evaluate the high-frequency visco-elastic dynamic modulus of asphalt concrete plate specimens vs. a master curve constructed from standard dynamic modulus tests. The master curve was used to temperature and frequency shift the high-frequency moduli to an 18°C, 25 Hz reference value for comparison. SASW results tended to overestimate the 25 Hz reference modulus obtained from the master curve. MASW results agreed well with the reference modulus, when shifted using the master curve equations, but overestimated the reference modulus when shifted using a power function approximation of the linear portion of the master curve.
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