Statewide implementation of very thin overlays.

Details

• Creators:
  Scullion, Tom ; Estakhri, Cindy ; Wilson, Bryan
• Corporate Creators:
  Texas A&M Transportation Institute
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Overlays (Pavements)
  • Thickness
  • Open graded aggregates
  • Gap graded aggregates
  • Dense graded aggregates
  • Performance tests
  • Rutting
  • Reflection cracking
  • Mix design
• Publication/ Report Number:
  FHWA/TX-14/5-5598-03-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Texas. Dept. of Transportation. Research and Technology Implementation Office
• Abstract:
  Very thin overlays are defined as overlays where the final lift thickness is 1 inch or less. These are designed ; to be high performance overlays in that they have to pass both a rutting (Hamburg Wheel tracking Test) and ; reflection cracking (Overlay Test) requirements. In this study three different types of thin overlay were ; designed and placed in the field; these being the open graded (fine Permeable Friction Course), gap graded ; (fine Stone matrix Asphalt) and fine dense graded mix. To meet the performance requirements, only high ; quality aggregates are recommended for these mixes, and for most applications the use of a PG 76-22 binder ; is recommended. Consequently these mixes cost approximately 30% more per ton than traditional Item 341 ; dense graded mixes. However, because of the thin placement temperatures a substantial savings per square ; yard has been reported when using these mixes. ; In this study, test sections were built in several districts around the state, and the performance to date has ; been excellent. Specifications were written, and many of the recommendations have been incorporated into ; the Construction Division’s current statewide specifications.
  More +
• Format:
  PDF
• Funding:
  Project 5-5598-03
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28344/dot_28344_DS1.pdf
• File Type:
  [PDF - 2.46 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:356b35fb26c93989bc8ac834923fefda29e966f94fddcfb71d10e65051f702a9