PREDICTION OF SERVICE LIFE OF ASPHALT CONCRETE WEARING COURSE USING WHEEL TRACKING TEST DATA FOR TEMPERATURE VARIATION IN MIXING AND COMPACTION PROCESS

This paper presents a model to predict service life of asphalt mixture. This research was triggered by the findings of the investigation by The Director General of Highways, Department of Public Work of Indonesia, on several Asphalt Mixing Plan in four provinces in Indonesia. The investigation team found several cases of uncontrolled temperature during the process of mixing asphalt in AMP, such as non-functioning of the thermometer, inaccurate temperature controlled by the operator. The dynamic stability test and deformation of the asphalt mixture data were used from Wheel Tracking Machine Test data. Then, proceed with the calculation of service life prediction by modifying an existing formula in Component Analysis Method 1971 of the Directorate General of Highways, Indonesia. Asphalt mixture (the job mix formula) samples were taken from a project in the region of West Sumatra province. This research shown that the temperature of the asphalt mixing and compaction process have significant impact to service lifetime. Especially in the mixing process, service lifetime will be reduced by 10% if the temperature of the process is less than 20oC of standard temperature. For the compaction process, a reduction is around 2% of service lifetime for a 10oC, and will be reduced by 10% if the temperature of compaction process is less than 50oC of standard temperature. This research could proceed by considering of mixing process time and other processes.