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| | Abstract | | Nondestructive testing for assessment of paved road has been demanded. FWD (Falling Weight Diflectometer) is one of the main methods for this demand. However, FWD data analysis to determine the elastic modulus of a paved road is still under-development. The authors conducted a feasibility study utilizing the MASW (Multichannel Analysis of Surface Waves) as a nondestructive test method for paved roads. Piezoelectric accelerometers and geophones were employed as receivers and the obtained results were compared. As a result of the study, we determined that geophones are suitable to estimate thicknesses and elastic wave velocities of paved asphalt if the A0 mode of Lamb waves is to be interpreted. We also determined that combining both this A0 Lamb mode interpretation and Normal Mode Solution using a genetic algorithm (Hayashi, 2012) would be an appropriate analytical method to characterize not only pavement surface materials but also its underlying roadbed and foundation in terms of its shear wave velocity structures. Further studies will be carried out to improve the method so as to make it a practical technique. |
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