Influence of Compaction Method on Rutting Resistance of Hot Mix Asphalt

Abstract

The main goal of the present investigation is the comparison between conventional Marshall and Superpave design methods for resistance to rutting if applied in the mix design of the wearing course layers in flexible pavements. Detailed work is completed to accomplish the goals of the study by implementing Marshall and Superpave specimens through utilizing aggregate from AL-Taji Quarry and asphalt cement with (40-50) grade from Dourah refinery plant and one sort of mineral filler. Specimens were fabricated by Marshall and Superpave methods and tested by creep tests to evaluate the strain for these mixes. The effect of compaction method and additives were investigated on the performance of these mixes. From the analysis results, it appears that; the Superpave blends are increasingly practical as compared to those with conventional Marshall blends. In addition, adding carbon fibers and lime to the blends decreases the strain mixture. It is additionally seen that the Superpave Gyratory compactor is equipped for accomplishing lower air void contents than the Marshall hammer. Furthermore, the Superpave mix reflects better resistance against permanent deformation. Finally, the present study recognizes the importance of using the Superpave system for design asphalt mix instead of the Marshall method in Iraq.