AN ASSESSMENT OF THE AVAILABLE METHODS OF ANALYSIS FOR ESTIMATING THE ELASTIC MODULI OF ROAD PAVEMENTS . THIRD INTERNATIONAL CONFERENCE ON BEARING CAPACITY OF ROADS AND AIRFIELDS. PROCEEDINGS, NORWEGIAN INSTITUTE OF TECHNOLOGY, TRONDHEIM, NORWAY, JULY 3-5 1990. VOLUMES 1-2

In view of the increasing trend of using an analytical approach both in pavement assessment and overlay design in Malaysia, there was a need to develop a reliable analysis package to assist in the interpretation of deflection data from the Road Rater and the Falling Weight Deflectometer (FWD). Several analysis programs were available, namely BISDEF, DEFMET, PHONIX, HOGG's model and system PEACH. These methods incorporated three different models. These were the exact analysis approach using BISAR as subroutine for BISDEF, HOGG's model and the use of the Method of Equivalent Thickness (MET) and Boussinesq equations (DEFMET, PHONIX AND PEACH). These programs were subjected to a series of tests provided by an elimination process. The temperature sensitivity of the computed moduli of pavement layers was also assessed. The results indicated that PHONIX and PEACH had good potential for structural evaluation of flexible pavements. (TRRL)