Abstract
This paper develops a method to backcalculate layer moduli from a time dependent data measured by FWD in site. The following three basic items are examined: 1) Set an origin in time domain load data. 2) Select sensor locations of which deflection data are used for backcalculation. 3) Determine an interval of the deflection data used for backcalculation. By using both dynamic and static backcalculation methods, layer moduli are estimated from sets of data measured every two hours at pavement whose profile is known and the results are compared in this paper. Validity of the backcalculation based on the dynamic analysis is confirmed.
