Validation of Guidelines for Evaluating the Moisture Susceptibility of WMA Technologies

National Cooperative Highway Research Project (NCHRP) 9-49, which was completed in 2013, developed guidelines for warm mix asphalt (WMA) mix design and quality control to identify and minimize any possibility of moisture susceptibility. The objective of the current project, NCHRP Project 9-49B, was to validate and revise, if necessary, the thresholds in the guidelines developed in NCHRP Project 9-49. The research was based on a survey of the state departments of transportation (DOTs) and paving contractors to identify WMA mixtures with available field performance, mix design, and quality assurance data, including wet indirect tensile (IDT) strengths and tensile strength ratios, wet resilient moduli and ratios, and Hamburg wheel tracking parameters. The survey identified 89 field projects with either IDT or Hamburg wheel tracking results. These results were analyzed to validate the thresholds established for the tests in NCHRP Project 9-49. The key practical outcome of the research is a flowchart presented in this report for conditioning and testing WMA laboratory specimens in the mix design process that incorporates the validated thresholds.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 43p
  • Serial:
    • NCHRP Report
    • Issue Number: 817
    • Publisher: Transportation Research Board
    • ISSN: 0077-5614
  • Publication flags:

    Open Access (libre)

Subject/Index Terms

Filing Info

  • Accession Number: 01593961
  • Record Type: Publication
  • ISBN: 9780309375061
  • Report/Paper Numbers: Project 09-49B
  • Files: TRIS, TRB, ATRI
  • Created Date: Mar 21 2016 11:07AM