IN-SITU EVALUATION OF CONCREAT PAVEMENT MODULUS USING A SIMPLE REGRESSION APPROCH

FWD testing and backcaluculation (BC) have been proved to be useful in pavement structural evaluation. However, the greatest amounts of calculating time and engineering judgments are needed in using current BC programs. By applying regression analysis to FEM calculation results, a simple in-situ evaluation approach has been developed in this paper, which can be conveniently used to estimate the modulus of subgrade reaction and slab elastic modulus under slab interior, joint and corner FWD loading cases. Furthermore the evaluation results from several pavements are presented to investigate the validity and accuracy of the proposed procedures.