Evaluating percent within limits (PWL) specifications volume 1 : HMA specifications.

Details

• Creators:
  Cross, Stephen A. ; Frantzen, Jeffrey A.
• Corporate Creators:
  Oklahoma State University. School of Civil & Environmental Engineering
• Corporate Contributors:
  Oklahoma. Dept. of Transportation. Planning & Research Division
• Subject/TRT Terms:
  • Pavements
  • Asphalt pavements
  • Concrete pavements
  • Quality assurance
  • Quality control
  • Pavements--Oklahoma--Quality control
  • Pavements, Asphalt--Oklahoma--Quality control
  • Pavements, Concrete--Oklahoma--Quality control
  • Quality assurance--Oklahoma
• Publication/ Report Number:
  FHWA/OK 06(05)
• Resource Type:
  Tech Report
• Geographical Coverage:
  Oklahoma
• Edition:
  Final report.
• Corporate Publisher:
  Oklahoma State University
• Abstract:
  The Oklahoma Department of Transportation (ODOT) has let four paving jobs for construction 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 the probability of ; conformance to the specifications. There is a need to evaluate the performance of the PWL specifications ; and assess the suitability of the PWL specifications for future jobs. ; Two hot mix asphalt (HMA) projects were let for construction using the proposed HMA PWL ; specifications. In addition to the normal quality control, acceptance and assurance sampling and testing, ; the ODOT Materials Division performed more extensive sampling and testing on randomly selected lots ; from each pavement which were designated “super lots.” ; The data obtained were to analyzed 1) to determine whether the PWL specifications are working as ; intended, 2) to recommend changes to the PWL specification if necessary, including possible changes to ; the limits and ranges contained within the specifications, and 3) to recommend whether ODOT should ; continue to pursue PWL specifications as matter of policy in their overall QA/QC programs. ; The examination of the draft HMA PWL specification and analysis of the super lot data demonstrated that ; the specification concept is sound and will require very little additional work to develop fully. The F and ; t-test procedure for process verification is recommended for use.
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• Format:
  PDF
• Funding:
  Item 2172
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23101/dot_23101_DS1.pdf
• File Type:
  [PDF - 887.43 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:f1560b577634b2db5630bfbd53f96ae78cd7da4dcf4184926030c3048904f49e8ff77195106d2486fa6cfd1f2a2fdbafc09ab4f3d81935b3ffb7e51930f66689