What About Overlays?

Concrete overlays increasingly are being used to rehabilitate and preserve existing pavements. Leaving the original pavement in place allows agencies to save money while making the pavement more sustainable. Concrete overlays come in two primary categories: bonded and unbonded. With bonded overlays, the new structure depends on the underlying pavement to act together with the overlay. The new pavement depends heavily on the strength of the underlying structure. Bonded overlays require that the existing pavement be in fair to good structural condition. They are generally thinner than unbonded overlays. Unbonded overlays treat the old pavement as a stable base for the new overlay. Unbonded concrete overlays are often placed to rehabilitate asphalt or concrete pavements that are in poor condition. Unbonded overlays do not require a bond between the new overlay and the existing pavement. They are generally thicker than bonded overlays. Both bonded and unbonded concrete overlays can be placed on concrete, asphalt, or composite pavements. Several projects that have successfully used concrete overlays are briefly described. To help promote the use of overlays, the American Concrete Pavement Association and the National Concrete Pavement Technology Center are providing training and technical support related to concrete overlays.

• Record URL:
  • http://www.betterroads.com/acpa-section/
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/1519687
• Publication Date: 2011-10

Language

• English

Media Info

• Media Type: Print
• Features: Photos;
• Pagination: pp 22-23, 25
• Serial:
  • Better Roads
  • Volume: 81
  • Issue Number: 10
  • Publisher: James Informational Media, Incorporated
  • ISSN: 0006-0208
  • Serial URL: http://www.betterroads.com

Subject/Index Terms

• TRT Terms: Bonding; Concrete overlays; Pavement maintenance; Pavements; Rehabilitation; Technical assistance; Training
• Subject Areas: Highways; Maintenance and Preservation; Pavements; I52: Construction of Pavements and Surfacings; I60: Maintenance;

Filing Info

• Accession Number: 01359216
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 20 2011 10:38AM