Experience with PWL on Warranty Projects

Virginia Route 288, a design/build/warranty project, and Missouri Route 63, a design/bid/build/warranty project, were constructed using percent within limits (PWL) specifications for the hot mix asphalt and the asphalt cement. Approximately 650,000 tons of HMA were placed on these two projects between 2002 and 2005. The two projects represent contrasts in type; location, materials, and delivery methodology; however, both contain limited long-term pavement performance warranty contracts. Unique project characteristics including terrain, weather, and local materials affected selection and use of particular quality indicators (i.e. asphalt content, density, thickness). Incentive and disincentive PWL specifications were used for the HMA while only disincentive PWL specifications were used for liquid asphalt on both projects. The warranty contract terms, performance criteria, in conjunction with performance risk factors were incorporated in the pavement design and subsequent selection of PWL quality properties to build the projects. Quality data, use, analysis, and administration of the PWL specifications are described in the paper to demonstrate both the success and limitations of PWL specifications within the context of long term pavement performance expectations as required by 15 and 20 year performance warranties. Issues and challenges related to implementation of PWL specifications on these projects are discussed briefly as well as recommendations outlined for future use and consideration.

Language

  • English

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Filing Info

  • Accession Number: 01041384
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 30 2007 1:29PM