HMA Warranties The Wisconsin Experience Presentation to the California Department of Transportation.

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Presentation transcript:

HMA Warranties The Wisconsin Experience Presentation to the California Department of Transportation

HMA Warranties Historical Perspective – What has been done so far The Benefits of Warranties Warranties in the 21 st Century - What the future holds for warranties

HMA Warranties Historical Perspective 1994 : WisDOT, FHWA and WAPA - Decided to pursue an innovative contracting method -Development of a warranty specification 1995 : 3 warranty projects constructed 1996: 3 warranty projects constructed

HMA Warranties Historical Perspective (cont.) 1997: 3 warranty projects constructed - Revised the original specification and included a provision for sealing all joints at the end of the third year. - Developed a specification for overlaying PCC pavements. - Constructed a PCC overlay warranty

HMA Warranties Historical Perspective (cont) 1998 : Constructed 4 projects –Minor revision changed the sealing of cracks from 3rd to 4th year 1999 : Constructed 5 projects - Warranties were expanded to include ancillary pavement 2000 : Constructed 6 projects - Original 3 projects, constructed in 95, reached warranty expiration in Year Total of 44 HMA Warranty Projects

Growth in Mileage

HMA Warranties The Benefits of Warranties One of the major benefits of warranties is a superior performing pavement. We measure pavement performance through Pavement Distress Index (PDI) and International Roughness Index (IRI). Warranties are performing better under both indices.

PDI Results

IRI Results

HMA Warranties Cost Analysis Using performance data we can do LCCA comparison between typical and warranty pavements. LCCA shows an economic benefit of warranted pavements (Break even point at 7% increase in initial cost.

HMA Warranties Other Benefits of Warranties Reduced WisDOT delivery costs Reduced maintenance expenditures Allows contractor innovation in researching and applying new technology Warranties are a tool. Manufacturer is responsible for their product

HMA Warranties What are the hurdles Change – Warranties are a wholesale change in the way we do business. There is a shift in responsibility from WisDOT to the contractor.

HMA Warranties The 21st Century Improvements made to the selection process/criteria All Asphalt Pavement projects will be “considered” for warranty Subgrade improvement initiative

HMA Warranties The 21st Century (cont) Extended Warranty Periods will be considered (ex: 7 year period) or tighter distress thresholds Incentive pay for exceptional performance

HMA Warranties Conclusion Warranties are a quality based initiative. Warranties are cost effective. Warranties are a tool. Steven Krebs 608/