The utilization of recycled asphalt concrete with warm mix asphalt

The asphalt paving industry is facing two major challenges. These include increased demands for environmentally friendly paving mixtures and increasing costs of raw materials. Recycling of reclaimed asphalt pavement (RAP) is a critical necessity to save precious aggregates and to reduce the use of costly bitumen. Warm Mix Asphalt (WMA) technology provides the option of recycling asphalt pavement at a lower temperature than the temperature maintained in Hot Mix Asphalt (HMA) and hence provides recycling higher contents of RAP and saving energy and money.This study investigated the feasibility of utilizing three different WMA additives (Sasobit®, Rediset®, Advera®) at different doses by weight of the bitumen with different percentages of RAP. Following the determination of the bitumen content, the aggregate gradation of RAP materials, Marshall Stability tests and Indirect Tensile Strength tests were conducted to evaluate the mechanical properties of the mixtures. Besides, cost-benefit analysis was made to investigate the advantages and disadvantages of recycling methods compared to HMA and WMA.The results indicated that it is possible to produce mixes with RAP that exhibits similar stability values as virgin mixes. Moreover, it was found that samples prepared with RAP exhibits advantage in terms of cost compared to samples prepared with both HMA and WMA.