De-Bonding of Hot Mix Asphalt Pavements in Washington State: An Initial Investigation

Recent evidence in Washington State indicates that de-bonding of HMA surface layers may become a significant problem. “De-bonding” describes a condition where adjacent layers of HMA lose adhesion to one another and can become separated. Typically, design and construction practice is to build in a certain amount of bonding, however the appropriate amount, testing and techniques are still under debate. For WSDOT pavements, which are generally thick and long-lasting, this de-bonding is thought to be more prevalent between the surface layer (usually applied as a preservation overlay) and underlying layers. This de-bonding may contribute to early failure of the HMA pavement surface layer, which can increase pavement preservation costs. This study gathers initial evidence on de-bonding in Washington State and attempts to define the problem scope and potential performance impacts. Specifically it attempts to (1) determine if de-bonding occurs, (2) identify possible de-bonding mechanisms, (3) define the scope of de-bonding in WSDOT pavements, (4) determine de-bonding impacts on pavement performance, and (5) identify the role of tack coats in de-bonding.

• Record URL:
  http://www.wsdot.wa.gov/research/reports/fullreports/712.1.pdf
• 
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/17234
• Corporate Authors:

  University of Washington, Seattle

  Transportation Northwest Regional Center X (TransNow)
  Box 352700, More Hall
  Seattle, WA  United States  98195-2700

  Washington State Department of Transportation

  Transportation Building, 310 Maple Park Avenue SE, P.O. Box 47300
  Olympia, WA  United States  98504-7300
• Authors:
  • Muench, Stephen T
  • Moomaw, Tim
• Publication Date: 2008-11

Language

• English

Media Info

• Media Type: Web
• Edition: Final Technical Report
• Features: Figures; References;
• Pagination: 51p

Subject/Index Terms

• TRT Terms: Asphalt pavements; Bonding; Debonding; Hot mix asphalt; Pavement performance; Paving; Surface course (Pavements); Tack coats
• Geographic Terms: Washington (State)
• Subject Areas: Construction; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I52: Construction of Pavements and Surfacings;

Filing Info

• Accession Number: 01118077
• Record Type: Publication
• Report/Paper Numbers: WA-RD 712.1, TNW 2008-10
• Files: TRIS, ATRI, STATEDOT
• Created Date: Dec 30 2008 12:37PM