![]() ![]() Field-measured stresses and strains may be used to quantify the reliability of the backcalculated moduli. ![]() Some of the backcalculation models have been simplified and field verification may be needed. There have been concerns among practitioners and the research community about the adequacy of the resilient moduli determined by the backcalculation software. The moduli can be input into semi-empirical mechanistic equations to estimate the remaining life of the pavement system and aid in informing pavement engineers about timing of maintenance and rehabilitation needs. Utilizing the deflections measured by the FWD, the resilient moduli of layers in the flexible pavement is determined using backcalculation software packages. Falling weight deflectometer (FWD) is currently used by most highway agencies to determine the structural condition of the highway network. ![]()
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