Evaluating Percent Within Limits (PWL) Specifications, Volume 2: Portland Cement Concrete Pavements

The Oklahoma Department of Transportation (ODOT) let four paving projects where “percent within limits” (PWL) specifications were employed. The PWL Specifications are intended to be used as part of the Quality Assessment program to determine the statistical probability of conformance to specified material properties and construction details, and to base the Pay Factor (PF) off of the probability of conformance to specifications. The specifications are relatively new to the ODOT, as are the governing principles. In fact, the four paving jobs are the first to implement the PWL specifications to calculate the probability of conformance and associated pay factors. This project evaluates the performance of the PWL specifications and the suitability of PWL specifications for future jobs. The objectives of this project were to: (1) Assess the accuracy of the PWL specifications in estimating the probabilities and judging the overall quality of the installed pavements and materials employed. (2) Evaluate qualitatively the PWL specifications for their ability to produce cooperation between ODOT and its contractors and to lessen the requirements for sampling and testing by ODOT. (3) Assess the PWL specifications for their ability to properly reward contractors for the quality of their efforts.

• Record URL:
  http://www.okladot.state.ok.us/hqdiv/p-r-div/spr-rip/library/reports/fhwa-ok0605v2.pdf
• 
• Corporate Authors:

  Oklahoma State University, Stillwater

  College of Engineering, Architecture, and Technology, 207 Engineering South
  Stillwater, OK  United States  74078-5033

  Oklahoma Department of Transportation

  200 NE 21st Street
  Oklahoma City, OK  United States  73105

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Russell, Bruce W
  • Frantzen, Jeffrey A
• Publication Date: 2008-2

Language

• English

Media Info

• Media Type: Web
• Edition: Final Report (Draft)
• Features: Figures; References; Tables;
• Pagination: 39p

Subject/Index Terms

• TRT Terms: Acceptance tests; Pavement management systems; Performance based specifications; Portland cement concrete; Quality assurance; Quality control
• Identifier Terms: Oklahoma Department of Transportation
• Uncontrolled Terms: Pay factors; Percent within limits
• Subject Areas: Highways; Pavements; I52: Construction of Pavements and Surfacings;

Filing Info

• Accession Number: 01470010
• Record Type: Publication
• Report/Paper Numbers: FHWA/OK 06(05), ODOT Item Number 2172, OSU: AA-5-84595
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Jan 17 2013 1:56PM