MULTI-LAYER PAVEMENT STRUCTURAL ANALYSIS USING METHOD OF EQUIVALENT THICKNESS CASE STUDY: JAKARTA – CIKAMPEK TOLL ROAD.

Abstract: An analytical method of overlay design has some advantages, such as to take into account the variation of loading types, which will give more exact and accurate results. The purpose of this research is to analyze the existing pavement structure of Jakarta-Cikampek toll road, for analysis period between 1995 to 2003 and to calculate the Residual Life and Overlay Thickness required, based on the deflection data using Falling Weight Deflectometer (FWD) equipment. The deflection bowl was then analyzed by Method of Equivalent Thickness (MET), firstly proposed by ODEMARK-ULLIDTZ and the results were Resilient Moduli in each layer. Considering the Cumulative Damage theory and the allowable stress/strain in each layer, the residual life of pavement and the overlay thickness needed were obtained. These results could be compared to the calculation results using semi-analytical method i.e. AASHTO ® 2002 method. The result of Resilient Moduli in each layer shows that those values could identify the weakness layer in the pavement structure, indicated by the lower value of Moduli. The calculation of Residual Life for each section showed some locations that needed to be overlaid immediately, because of those values are nearly zero or less than 1 year. On the other hand, there were some sections having Residual Life more than 20 years. This means that pavement structure in those sections was strong enough and need not to be repaired in short term. In general, the Residual Life and Overlay Thickness calculated by those two methods i.e. MET and AASHTO method, were indifferent significantly