PAVEMENT STRUCTURAL ANALYSIS USING FALLING WEIGHT DEFLECTOMETER

This paper describes a method for evaluating a structural capacity of an asphalt pavement with falling weight deflectometer deflection data.A back-analysis was used to estimate in situ elastic moduli of a granular subbase and a subgrade in the pavement.A tensile strain at a bottom of the asphalt layer and a compressive strain in the subgrade surface under the standard wheel load were calculated with the BISAR.A number of allowable loading repetition corresponding to the tensile strain and the compressive strain were estimated with an asphalt strain criteria and a subgrade strain criteria obtained by many researchers.The asphalt strain criteria was very useful imformation for a theoretical design method on asphalt pavements and overlay design, because there was a correlation between the cracking data and asphalt strain criteria in the national highway 337.