United States Department of Transportation
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Comparing Pavement Responses Under FWD and Truck Loads
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1993-07-01
[PDF-1.30 MB]
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Edition:Interim: Sept. 1990 - Sept. 1992
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Abstract:This report discusses the analyses of deflection data collected on thick and thin asphaltic concrete pavement sections instrumented with Multi-depth Deflectometers (MDD's). Surface and depth deflection data were collected under both FWD and truck loadings. Linear elastic analysis was performed to compare layer moduli back calculation from FWD surface deflections only, and FWD surface and MDD depth deflections combined, Researchers compared back calculated moduli values with the laboratory results. The moduli calculated from FWD loads were also used to predict pavement response under known truck loads. These predictions were compared to the actual measured response. In general, it was found that the FWD characterization slightly overestimates the strength of the subgrade and underpredicts the vertical compressive subgrade strains induced by truck loads by between 14 and 18%.
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