It is important to determine the best procedures for constructing recycled bases and whether the current methods are contributing to random cracking or structural failure. Also, there are questions concerning the tendency of the recycled blend to compact into a section which performs more like asphalt concrete rather than granular material. When the recycled blend is placed immediately below the new asphalt concrete both layers may be acting more as a single full depth asphalt pavement rather than separate layers. On the other hand, when a virgin layer is placed between the recycled blend and the new asphalt concrete the impermeability of the underlying recycled blend may adversely affect pavement performance.
The purpose of this research is to optimize the use of recycled asphalt concrete and base materials and develop recommendations for changes to our current construction practices which will achieve an improvement in the quality and performance of these bases.