Abstract
Recycling is the process of reusing the existing pavement materials that no longer serve the traffic effectively. In this work, the durability of reclaimed asphalt pavement after recycling was investigated in terms of rutting resistance and fatigue life. Three types of recycling agents (soft asphalt cement, soft asphalt cement blended with silica fumes and soft asphalt cement blended with fly ash) have been implemented in the construction of roller compacted asphalt pavement slab samples. Slab samples were subjected to wheel tracking test, and the rutting resistance was determined. Beam specimens were obtained from the slab samples after practicing the wheel tracking test at selected locations (wheel path, outside the wheel path), and subjected to fatigue resistance test under repeated loading. The evaluation of fatigue life was discussed through three selected parameters, the slope, intercept, and the Rut depth, which was measured at 5000 cycles. It was concluded that the control mixture has higher resistance to Rutting as compared with the recycled mixture, the Rut depth for recycled mixtures with Soft Ac, Soft Ac + Fly ash, Soft Ac + Silica Fume were ( 3.13, 2.76 and 2.53 )mm, respectively, while it was 0.99 mm for control mixture. The tensile strain at 2000 load repetition was selected as reference for fatigue life comparison. At the wheel path, the lowest tensile strain could be figured at the control mix, while the recycled mixes exhibits higher tensile strain. Recycled sample with Soft Ac + Fly ash exhibits the highest tensile strain.
