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The environmental and economic benefits of recycling asphalt pavements havereceived much attention in recent years. Because of the increase in the cost ofraw materials and energy carriers, the reuse of large portions of reclaimedasphalt pavement (RAP) is critical in reducing both the cost and environmentalfootprint of asphalt pavements. High-RAP mixtures are more prone to lowtemperature cracking and poor mixture workability because of the higherstiffness of RAP binder. Recycling agents are one of the additives which areused to improve these deficiencies. However, there is some ambiguity about theoptimum content of recycling agent to assure proper performance of recycledasphalt pavement during its service life. The current study used 60% and 100%fractionated RAP with waste cooking oil as a recycling agent and crumb rubberto alleviate the aforementioned problems. Laboratory evaluation showed thatincreasing the amount of recycling agent in the high-RAP mixtures improvedtheir workability and low temperature performance while decreasing moisturedamage and rutting resistance. The long-term susceptibility to aging ofrecycled binder with the organically-based recycling agent was alsoinvestigated. A procedure to obtain the optimum percentage of recycling agentwas devised to strike a balance between the performance characteristics ofmixtures with a high-RAP content.

Investigating Short-term and Long-term Binder Performance of High-RAP Mixtures Containing Waste Cooking Oil