Laboratory Evaluation of Complex Modulus and Fatigue Resistance of Asphalt Mixtures with RAP

The evaluation of the performance of recycled asphalt mixtures is a priority for the asphalt materials community. The results of the investigation dealing with the linear viscoelastic properties and fatigue resistance on RAP mixtures are presented. Complex modulus and fatigue properties of recycled asphalt mixtures are investigated on tension-compression tests (T-C). Four asphalt mixtures including four RAP contents (0, 15, 25, 40 %), one virgin aggregate, and one asphalt binder (PG 64-28) were investigated in this study. In general, the results of this study indicate that: 1) the asphalt mixtures containing RAP have higher or similar stiffness with the control mixture containing no RAP, 2) the asphalt mixtures containing 25 % RAP have the highest stiffness at lower temperatures or high frequencies, and 3) no general trend was found between the amount of RAP and the number of cycles to reach fatigue failure. In addition, high fatigue resistance was observed in mixtures containing 40 % RAP.