Effect of recycled materials on marshall performance of hot asphalt mixture (HMA – RAP)

Abstract

Limitations of road construction materials and increasing demand of aggregate and asphalt have resulted in high construction costs and road rehabilitation so that alternative materials such as reclaimed asphalt pavement (RAP) are needed. In this study using RAP variation of 10-30% to the total weight of the mixture. In the HMA-RAP mixture that was heated at a temperature of 150°C then mixed with aggregate at a temperature of 170-180°C and asphalt at a viscosity temperature of 153°C so that the new mixing temperature was obtained in 148-153°C, with a penetrating approach and soft point was obtained optimum reclamate rejuvenation content of 23% to be mixed into the RAP heat mixture. The test results showed an increase in RAP levels, the optimum value of asphalt level (KAO) decreased so that the asphalt in the RAP material can be activated and mixed well so that it can reduce the amount of used asphalt in the mixture. Furthermore, for the mixed performance with Marshall test, the highest stability value was 1648.09 kg in the RAP30% mixture and the increase in residual Marshall stability was 90.8%, this showed that the mixture stability to the influence of water, changes in temperature and bonds between new materials (pen60 / 70 asphalt and aggregate) with RAP material was still good.