ASPHALTIC PAVEMENT WARRANTIES: INNOVATIVE CONTRACTING PRACTICES SPECIAL EXPERIMENTAL PROJECT #14. THREE-YEAR PROGRESS REPORT

In 1995, the Wisconsin Department of Transportation (WisDOT) and the Wisconsin Asphalt Pavement Association had developed and began constructing asphaltic pavements with a warranty specification. By the end of 1997 nine warranted pavements were constructed. The warranty period is five years and requires the contractor to perform remedial (corrective) work whenever a distress threshold is exceeded. The warranty specifications are based upon specific pavement distresses (rather than ride or any other factor). distress thresholds were established at levels which WisDOT's pavement management system indicated were typical for five-year old pavements. Based upon three years of experience, the warranted pavements are performing better than typical pavements (considering ride values and all distress factors). For example, the typical international roughneww index (in meters per kilometer) for a standard pavement at three years of age is 1.36, while the warranted at three years averages 0.80 - significantly better. The distress index is also lower for the warranted projects. Based upon limited data and considering all factors, it appears that warranted pavements also cost less per ton than standard projects. Warranties appear to have reduced State construction delivery costs. No distress thresholds have beenm which means no remedial work (warranted) has been performed.