THE EFFECT OF INCORPORATING RECLAIMED ASPHALT PAVEMENT ON THE PERFORMANCE OF HOT MIX ASPHALT MIXTURES

Abstract

In pavement industries, incorporating appropriate amount of reclaimed asphalt pavement (RAP) in the fresh mixtures is one of the approaches to attain sustainable principle in construction. Usage RAP materials have been practiced since 1970s, however, pavements made with RAP will reach the end of service life and need to be recycled again. Only a few studies done on the second recycle of RAP (R2AP). Therefore, this paper aimed to investigate the effect of incorporating RAP and R2AP in the asphalt mixture. RAP was collected from in-service road which was exposed to the environment and traffic for seven years. While, the second cycle of RAP (R2AP) was obtained through the laboratory aging process. 20, 40, and 60 % of RAP and R2AP were mixed with fresh dense graded aggregates to form Asphaltic Concrete with 14 mm nominal maximum aggregate size (AC 14). Resilient modulus test was performed to evaluate the performance on rutting resistance. Tensile strength was also evaluated at 25 °C as an indicator for fatigue resistance. 60 % of RAP and 40 % of R2AP are observed to the best optimum amount to be added in the fresh mixture in order to improve both fatigue and rutting resistance.