Roadway deteriorate over time, resulting in raveling, cracking, and fatigue damage. Globally, over 750 million tons of RAP are generated annually. On an average, only less than 20 %, of RAP is recycled, the rest ships to landfills.
To accommodate growing needs, there is an need to expand the global network of roadways. This results in the increased depletion of natural resources, such as virgin bitumen and aggregates.
The industry is attempting to maximize RAP usage. It has been demonstrated that there is a reduction in Green House Gases (GHG) with increasing RAP usage. Increasing RAP from 0% to 60%, the total GHG emissions decreases from 72 to 51 Kg of CO2 [Courtesy: N Michel, AfPA Tech Talk, Nov 23, 2021].