Backcalculation Procedure for Bonded Concrete Overlays of Asphalt Pavement

Bonded concrete overlays of asphalt (BCOA), previously known as ultrathin whitetopping, have become increasingly common in Illinois in the past 15 years. No methods exist for assessing in situ properties under loading for this type of overlay. A procedure to backcalculate layer properties from falling weight deflectometer tests does exist for concrete slabs on grade with infinite dimensions, but this method is not applicable to finite-sized BCOA slabs with multiple layers and interfaces. Based on two-dimensional finite element modeling of BCOA pavements, a backcalculation procedure was derived for a range of expected slab sizes, effective concrete pavement thicknesses, joint load transfer efficiencies, and foundation layer stiffnesses. The backcalculated effective concrete thickness quantifies the load-carrying capacity of the BCOA pavement, variation of the structural capacity as a function of distance along the roadway, and potentially the condition of the concrete–asphalt bond interface and the underlying asphalt concrete layer. Application of the BCOA backcalculation procedure to falling weight deflectometer data collected from several projects in Illinois confirmed the reasonableness of the procedure through observed performance and estimated layer thicknesses from construction.

• Record URL:
  • https://doi.org/10.3141/2457-08
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780309295444
• Authors:
  • King, Daniel
  • Roesler, Jeffery R
• Publication Date: 2014

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 72–79
• Monograph Title: Pavement Management 2014, Volume 3
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Issue Number: 2457
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Asphalt pavements; Backcalculation; Concrete overlays; Falling weight deflectometers; Finite element method; Thickness
• Uncontrolled Terms: Bonded concrete overlays; Ultra-thin whitetopping
• Geographic Terms: Illinois
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 01518445
• Record Type: Publication
• ISBN: 9780309295444
• Report/Paper Numbers: 14-4476
• Files: PRP, TRIS, TRB, ATRI
• Created Date: Mar 19 2014 11:04AM