Synthesis of Information Related to Highway Practices. Topic 51-07. Practices for Assessing and Mitigating the Moisture Susceptibility of Asphalt Pavements

Moisture-induced damage of asphalt pavements is a national problem; millions of dollars are spent each year on maintenance of flexible pavements. In general, moisture damage involves physical, chemical, mechanical, and thermodynamic processes, all occurring within the asphalt mixture at different magnitudes and rates. Some of the mechanisms of moisture damage include adhesion failure between asphalt and aggregate, cohesion failure within the asphalt binder, emulsification of the asphalt, freezing of entrapped water, and cohesion degradation within the aggregate. Different agencies and research groups are continually searching for methods that can be used to identify and prevent potential moisture damage in asphalt pavements. Most of the methods adopted by state departments of transportation (DOT) focus on testing asphalt mixtures and the adhesive bond between the aggregate and the asphalt binders. Some agencies use prescriptive methods, such as requiring the use of liquid additives, hydrated lime, or materials-based specifications. Agencies are also looking into other practices to help assess moisture damage, such as the MIST device, surface free energy analyses, and asphalt chemical analyses. The objective of this synthesis is to document current practices used by DOTs to assess and mitigate the potential for moisture-induced damage in asphalt pavements. The study will focus on asphalt mix design and acceptance. Information will be gathered through literature review, a survey of DOTs, and interviews with selected agencies for the development of case examples. The survey should be directed to DOT voting members of the AASHTO Committee on Materials and Pavements. Knowledge gaps and suggestions for research to address those gaps will be identified.

• Record URL:
  http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=4720

Language

• English

Project

• Status: Active
• Funding: $45000
• Contract Numbers:

  Project 20-05, Topic 51-07

• Sponsor Organizations:

  National Cooperative Highway Research Program

  Transportation Research Board
  500 Fifth Street, NW
  Washington, DC  United States  20001

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  American Association of State Highway and Transportation Officials (AASHTO)

  444 North Capitol Street, NW
  Washington, DC  United States  20001
• Project Managers:

  Gause, Jo

• Performing Organizations:

  Purdue University

  1040 South River Road
  West Lafayette, IN  United States  47907
• Principal Investigators:

  McDaniel, Rebecca

• Start Date: 20190924
• Expected Completion Date: 0
• Actual Completion Date: 0

Subject/Index Terms

• TRT Terms: Asphalt pavements; Evaluation and assessment; Guidelines; Literature reviews; Mix design; Moisture damage; State departments of transportation; State of the practice; Surveys; Test procedures
• Subject Areas: Highways; Maintenance and Preservation; Pavements;

Filing Info

• Accession Number: 01704610
• Record Type: Research project
• Source Agency: Transportation Research Board
• Contract Numbers: Project 20-05, Topic 51-07
• Files: TRB, RIP
• Created Date: May 13 2019 3:09PM