Performance Evaluation for Rutting and Moisture damage of Hot Asphalt Mixtures using High Percentage of Recycled Asphalt Pavement Material

Abstract

Recycled Asphalt Pavement (RAP) usage has increased a lot from the last two decades. World highway agencies are attempting to use higher quantities of RAP to cope up with not only economic and green environment but also to save natural resource and comparable or even better performing hot mix asphalt (HMA) mixtures. Continuous damages of flexible pavements like rutting, moisture damage and thermal cracking reduces the pavement performance as well as riding quality. Studies have shown that high amount of RAP mixtures has impact on the fatigue performance, stiffness and permanent rut deformation characteristics of hot mix asphalt. Therefore, this study was done by using experimental approach to check the rutting and moisture damages of RAP combined with HMA by using Hamburg Wheel-tracking Device (HWTD). The hot mix asphalt designs included a control or having mix with 0% RAP and six samples of HMA with 10%, 20%, 30%, 45%, 60% and 100% recycled asphalt mixture to get an optimum percentage on which performance testing was done, after finding out the corresponding volumetric properties of mixtures stability and flow parameters of RAP mixtures. In this research all tested mixtures with RAP showed better performance than the virgin mixes.