Characterization of pavement structure on the OH-SHRP Test Road using Spectral-Analysis-of-Surface-Waves method.

摘要

An in-situ nondestructive testing method known as Spectral-Analysis-of-Surface-Waves (SASW) method is utilized to assess the properties of materials and layer thicknesses of pavement structures. The test were performed on the OH-SHRP Test Road project. All three phases of the SASW method, including field data collection, construction of the dispersion curve and the inversion process, are presented. Besides addressing the main objective, the materials used to attach a receiver onto a pavement surface was also investigated. Alternative materials considered were of wax, putty and epoxy types. Based on test results obtained from both PCC and AC pavement types, the putty material offered the best quality of wave signal among these materials. The effect of a vertical boundary in rigid pavement on the dispersion curve is also investigated using test arrays oriented perpendicular and parallel to the pavement joint. It can be concluded that the test array and the receiver should be placed at a distance at least 5.0 ft away from the pavement joints and edge to minimize the effect of reflected wave on the dispersion curve. Finally, an inversion technique which was developed in-house is utilized. The versatility of this inversion technique is illustrated by tests performed on both rigid and flexible pavement types. The results obtained from the SASW method compare reasonably well with those obtained in laboratory tests.