A COMPARISON OF THE PREDICTED PERFORMANCE OF VIRGIN AND RECYCLED MIXES

The Marshall design method is the most commonly used method for the de sign of virgin and recycled mixes. However, the Marshall design proced ure does not provide the field performance of the mix in terms of fati gue, rutting, thermal cracking, and moisture damage. The Asphalt Aggre gate Mixture Analysis System (AAMAS) and the program called SUPERPAVE, developed in Strategic Highway Research Program, are two performance- based mix design methods that can address most forms of pavement distr ess. Although the AAMAS program was developed using virgin mixes, the AAMAS design criterion for this study was applied to recycled mixes. S pecifically, the predicted performance of recycled mixes was compared with that of virgin mixes. In general, all of the mixes evaluated sati sfied the AAMAS criteria. However, the results indicated that the fati gue resistance decreased as the recycling percentage increased. The re cycled mixes had higher resistance to moisture damage when compared wi th virgin mixes.