Rut Resistance of Foamed Warm Mix Asphalt Containing RAP

This paper evaluated the stiffness characteristic and rutting resistance of warm-mix asphalt (WMA) mixtures containing different percentages of reclaimed asphalt pavement (RAP) through laboratory performance tests. The WMA mixtures were plant-produced with a commonly-used foaming technology in the U.S. RAP content ranged from 15% up to 40%. Laboratory performance tests included resilient modulus test, dynamic modulus test, and asphalt pavement analyzer (APA) rutting test. For comparison purpose, hot mix asphalt (HMA) mixtures containing 15% and 30% RAP were also evaluated and compared to WMA. Based on the laboratory test results, WMA mixtures with RAP showed high rut resistance and were expected to perform satisfactorily in terms of rutting.