Falling Weight Deflectometer and Spectral Analysis of Surface Waves Test for Characterizing Pavement Moduli: A Case Study.

摘要

The report details the results of tests on newly constructed flexible pavement using a Dynatest 9000 Falling Weight Deflectometer and the Spectral Analysis of Surface Waves test. Additional types of field and laboratory tests were also undertaken and are reported in the study. Taken together, the data and analyses represent a detailed case study of the two non-destructive test methods. When dynamic effects and the demonstrated non-linear behavior of the soil are accounted for, Spectral Analysis of Surface Waves and the Falling Weight Deflectometer provide similar subgrade moduli. The excitation frequency of Spectral Analysis of Surface Waves and the Falling Weight Deflectometer differ by two to three orders of magnitude in the surface layer, and one to two orders of magnitude in the subgrade. However, results from Spectral Analysis of Surface Waves and Falling Weight Deflectometer tests for the asphalt concrete are consistent when adjusted to a common frequency. Spectral Analysis of Surface Waves and the Falling Weight Deflectometer were both useful for characterizing the material of Ramp SW. Analysis and application of the data from these techniques should include consideration of dynamic loading, non-linear behavior in the subgrade, and frequency sensitivity in the asphalt.