An asphalt concrete pavement should be designed to provide a durable, skid resistance and surface under in-service conditions. Also, it is essential to minimize cracking and rutting in the asphalt concrete layers. The purpose of this paper is to evaluate the effect of adding the polypropylene pellets (pp) on the deformations characteristics of 80/100 asphalt concrete mixtures and comparing with 60/70 asphalt concrete mixtures under different stress levels, temperature and loading time. The asphalt mixtures in this study were designed by using Marshall procedure according to ERBA (T-231). The rutting and creep specimens were duplicated for Alex. 60/70 asphalt mixtures without modification and Alex. 80/100 asphalt mixtures at PP/A = 0.3 and 4% at their O.A.C. The results of this study indicate that, the higher rutting and resistance was attended by increasing the stability and decreasing the flow for different 80/100 asphalt mixtures. The 80/100 asphalt mixture at 4% PP/A ratio provides much better long-tem performance than the others. Moreover this asphalt mixture gives the lowest rate of increasing in creep when increasing the stress level. Finally, correlation between wheel tracking test and creep test is developed at 25ºC and stress level of 6.25 Kg/cm2. |
