ANALYSIS OF ROAD DAMAGE DUE TO OVER LOADING (CASE STUDY: DEMAK -TRENGGULI ARTERIAL ROAD, CENTRAL JAVA PROVINCE, INDONESIA)

Abstract

ABSTRACT The ability of a pavement structure in carrying out its function reduces in line with the increase of traffic load, especially if there are overloaded heavy vehicle passing through the road. In this thesis, the effect of overloaded vehicles on the road pavement service life was analyzed using the AASHTO 1993. Vehicle damage factor (VDF) and Structural Number (SN) were calculated on normal and overloading conditions. Remaining of pavement service life due to overloading condition was also presented. So it can be concluded how severe the effect of overloaded vehicles against pavement service life. In this thesis it can be seen, that the presence of overloaded vehicles, particularly heavy vehicles (class 6B up to class 7C according to Bina Marga’s vehicle classification) resulted in traffic load (W18) value that was 200% greater than that of standard load condition. The increase of W18 value can affect the pavement service life. For the direction of Demak Trengguli, the pavement service life reduced by 70% due to overloading condition, while for the opposite direction, the service life was reduced by 40% caused by the same factor. In terms of layer thickness, overloading condition also increase the layer thickness than that of thickness at the load legal limit 10 ton. For the direction of Demak-Trengguli, the thickness reached 186% higher than of standard design, while for the direction of Trengguli-Demak, it’s obtained that due to overloading condition, the layer thickness approximately 177% higher than that of standard design. From the results, it can be concluded that overloaded vehicles on the road are very influential to the reduction in pavement service life. Therefore, it is expected that road users to comply with existing regulations in the conduct of transportation. Key words: overload vehicle, damage factor, pavement service life, pavement thickness.