Full-scale and Laboratory Fatigue Cracking Performance of Combined High-Recycle and Warm Mix Asphalt Pavements

The Federal Highway Administration’s Office of Infrastructure Research and Development has initiated a full-scale accelerated pavement testing experiment to evaluate the fatigue cracking performance of sustainable asphalt materials and mix designs. Recycled asphalt pavement (RAP) contents providing up to 40% asphalt binder replaced (ABR) by 44% by RAP by weight have been incorporated in hot mix asphalt (HMA) production as well as reduced-temperature warm mix asphalt (WMA) that was produced with water foaming and chemical additive. Recycled asphalt shingles (RAS) have been incorporated to provide 20% ABR in HMA. The objective of the experiment is to establish realistic boundaries for high-RAP & RAS mixtures employing WMA technologies based on percent binder replacement and binder grade changes when combined together. This paper will document the construction, the as-built engineering properties of the 10 different test sections characterized in the laboratory, and the full scale fatigue cracking performance.