Performance Comparison of Different Molding Methods of Sasobit Warm Mix Recycled Asphalt Mixture 

Shengchao LIANG

Chongqing Jiaotong University, Chongqing,400074, CHINA 

Abstract: The Super-pave design method was applied to optimize three synthetic gradations and the Marshall test was applied determined the optimum asphalt content which showed the selected synthetic grade II was the best synthesis of gradation, the optimum asphalt dosage is 4.5%. The Marshall hit and gyratory compaction were selected to analyze the performance of Sasobit warm mix recycled asphalt mixture based on the optimum gradation and the optimum asphalt content. It can be shown from the test that the dynamic stability of the rotating compacted specimens is 110% higher than that of the Marshall specimens, the failure strength modulus is 12.6%, the splitting tensile strength is 11.6%, and the TSR height is 5.1%.The VV of warm mix recycled mixture specimen formed by the rotating compaction method is smaller, the stress relaxation ability stronger, and the ability of resisting water erosion better, than that of the Marshall hit. The former can simulate the actual construction pavement compaction situation better with positive performance of high temperature, low temperature and stability of water, which could provide reference for future warm mix reclaimed asphalt pavement construction design and experiment method. 

Keywords: Warm mix recycled asphalt mixture; forming method; Superpave; High temperature stability; Low temperature crack resistance; Water stability