Enhancement of Rutting Resistance for HMA Pavement Layers by Incorporating with SBS Modified Asphalt and A High Percentage of RAP

Civil Engineering Department, Collage of Engineering, Al-Nahrain University, Baghdad, Iraq

^a* Corresponding author zynabmalik1234@gmail.com
^b alaa.abed@eng.nahrainuniv.edu.iq

Abstract

The loss of natural resources is one of the growing problems due to the inability to replace these resources on the one hand, and environmental pollution resulting from damage to asphalt pavements on the other hand. So the use of RAP in asphalt mixture has been promoted. The research addressed the inclusion of RAP in bulk and its effect on the resistance of asphalt mixtures to "RUTTING" as one of the most important problems. What mixtures are exposed to during high-temperature cycles where there are four different percentages of RAP (10, 15, 20, 25%), (30, 40, 50, 60%) and (40, 50, 60, 70%) For each of the three paving layers (surface, bond, base) respectively. Four samples were taken at three different temperatures (45, 55, and 70) degrees Celsius of asphalt mixtures for each of the three pavement layers. Various types of asphalt bonds have been used. To evaluate mixtures during the Hamburg Wheel Track test at different temperatures. The results indicated an improvement in the corrosion resistance of the mixture with the inclusion of RAP. The resistance of the asphalt mixture increased when SBS asphalt was used, which improved the mechanical properties of the asphalt mixtures. The experimental results of the Hamburg wheel test also showed a significant improvement in "Rutting Resistance" when RAP was added at its optimum value. For each of the three layers (surface, binder, base), the use of SBS modified asphalt reduces permanent deformation of the asphalt mixture.