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| | Abstract | | The Falling Weight Deflectometer (FWD) is widely used for the evaluation of pavement soundness. Conventional FWD data analysis has only used the maximum displacement as static response of pavement in spite of full waveform data acquisition during weight dropping. Dynamic analysis has been rarely applied as well as verification of FWD analytical results. In this report, we show a result of comparative measurements of FWD and GPR. We conducted FWD at 70 points along the peripheral road in the PWRI Tsukuba Institute. Dense GPR surveys were also carried out over the road to delineate pavement structure. First, we verified FWD results using not only maximum displacement values but also peak times. Consequently, it was revealed that the difference of pavement structures shifted the peak time of maximum displacement. It means the necessity of dynamic analysis for estimating detailed physical property and structure of the pavement. Second, dense GPR surveys clarified heterogeneity or sudden change in pavement structure, and demonstrated sporadic measurement like as conventional FWD was inappropriate to evaluate soundness of the pavements. Continuous measurements are needful to detect local heterogeneity in the pavements. GPR and non-contact type surface wave measurement would be capable to investigate of pavement structure. |
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