BITUMINOUS OVERLAY POLICY - A PERFORMANCE EVALUATION. FINAL REPORT

To address an increasing backlog of roadways in need of rehabilitation, the Illinois Department of Transportation (IDOT) began use of a standard overlay thickness policy in the early 1980s. On the non-interstate, or primary, system, first resurfacings or overlays over pavements being widened and resurfaced were allowed 2.5 in. (6.35 cm). Subsequent resurfacings were limited to 2 in. (5.08 cm). A provision in the policy allowed for exceptions. This report presents the results of an evaluation of the performance of bituminous overlays constructed on the primary system in accordance with IDOT's overlay policy. Twelve projects were selected for monitoring. The results of visual surveys, deflection testing, and Condition Rating Survey (CRS) histories were analyzed. The standard overlay thickness policy met the FHWA-required minimum 5-year performance period for Federal-aid rehabilitation projects on the primary system. Subsequent overlays were found to have shorter life spans than first overlays. Records of requests for exceptions to the standard overlay thickness policy were also reviewed. Information gathered from the records review was incorporated into the policy and used to create a more efficient process for reviewing requests for exceptions.

• Record URL:
  • https://ntlrepository.blob.core.windows.net/lib/5000/5700/5774/bop.pdf
• 
• Supplemental Notes:
  • Study title: Evaluation of Bituminous Overlay Performance.
• Corporate Authors:

  Illinois Department of Transportation

  Bureau of Materials and Physical Research
  126 East Ash Street
  Springfield, IL  United States  62704-4766

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Schutzbach, A M
• Publication Date: 1995-2

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 50 p.

Subject/Index Terms

• TRT Terms: Bituminous overlays; Condition surveys; Deflection tests; Durability; Overlays (Pavements); Performance evaluations; Policy; Primary highways; State departments of transportation; Surveying; Thickness
• Uncontrolled Terms: Visual surveys
• Geographic Terms: Illinois
• Subject Areas: Design; Highways; Pavements; Policy; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00682778
• Record Type: Publication
• Report/Paper Numbers: FHWA/IL/PR-116
• Contract Numbers: IHR-530
• Files: NTL, TRIS, USDOT, STATEDOT
• Created Date: Aug 8 1995 12:00AM