Comparison analysis of overlay thickness using the AASHTO 1993 method and the everseries program

Abstract

The purpose of this research is to analyze the structural capacity of flexible pavement based on deflection data from Falling Weight Deflectometer (FWD) and to compare the results of overlay thickness calculation using AASHTO 1993 Method and Everseries Program. Two layer modelling system is applied in AASHTO 1993 Method and to determine the value of Resilient Modulus (MR), Pavement Effective Modulus (Ep) and Structural Number (SN). The overlay thickness result by AASHTO 1993 method ranged from 5 cm to 13 cm. To comparing the result, the 2-layer system modeling by Everseries Program is used. The modulus can be calculated by Evercalc subprogram using the deflection data as inputs. Furthermore, the overlay thickness calculated by Everpave subprogram produces overlay thickness range from 5 cm to 25 cm. Based on the analysis result, there is a difference overlay thickness between using AASHTO 1993 Method and Everseries Program. Everseries program produce overlay thickness thicker than AASHTO 1993 method, because there are several different parameters such as deflection data, temperature by seasonal variations and traffic loads.