As part of the Long Term Pavement Performance (LTPP) Program, the Arizona Department of Transportation (ADOT) constructed 11 Specific Pavement Study?5 (SPS?5) test sections on Interstate 8 near Casa Grande. The SPS?5 project studied a variety of different rehabilitation methods for asphalt concrete pavements. The project was opened to traffic in 1990 and monitored at regular intervals until it was placed out of study in 2009. Surface distress, profile, and deflection data collected throughout the life of the pavement were used to evaluate the performance of rehabilitation methods using unique combinations of minimal and intensive surface preparation, virgin and recycled asphalt, and thick and thin overlay thicknesses. This report documents the analyses conducted as well as practical findings and lessons learned that will be of interest to ADOT.


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