In addition, they consider static loading, which is not the true representation of the dynamic loads applied in a FWD test in the field. A concern with the available backcalculation software is that their analysis algorithms are based on layered elastic theory with linear materials models. It is shown that EVERCALC software produces more consistent and accurate modulus values than the BAKFAA and MODULUS software. Consistency is examined by statistical analysis using three sets of FWD deflection data produced by three loads with magnitudes of 9, 12, and 16 kip at an identical location of an airport pavement. To examine accuracy, software predicted modulus values are compared to the laboratory tested modulus values of soils, aggregate, and asphalts. In this study three backcalculation software namely, BAKFAA, EVERCALC, and MODULUS are evaluated for consistency and accuracy. However it is not known which software produces accurate and consistence modulus values. Currently, several backcalculation software are available.
Falling Weight Deflectometer (FWD) test data are processed by backcalculation software to obtain modulus of layer materials of airport pavements.
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