MOISTURE SUSCEPTIBILITY OF HMA MIXES: IDENTIFICATION OF PROBLEM AND RECOMMENDED SOLUTIONS

Stripping of hot mix asphalt (HMA) pavements appears to have become a major problem in recent years. More and more states are specifying the use of antistripping agents. There is a need to identify the problem properly so that decisions are not made based on visual observations of some isolated distressed areas. External factors and/or in-place properties of the HMA pavements can induce premature stripping in HMA pavements. This paper describes these factors such as inadequate pavement drainage, inadequate compaction of HMA pavement, excessive dust coating on aggregate, inadequate drying of aggregates, and overlays on concrete pavements. Suggestions for alleviating the problems associated with these factors have been given. An investigative methodology based on forensic experience has been recommended for use by the specifying agencies and industry to establish stripping as a problem on a specific project or statewide. The current practices of specifying moisture susceptibility tests across the United States have been reviewed. AASHTO T283 (Modified Lottman) test method has been recommended to determine moisture susceptibility of HMA mixes until more suitable and reliable tests are developed and validated by SHRP or other agencies.

• 
• Corporate Authors:

  National Center for Asphalt Technology

  Auburn University, 277 Technology Parkway
  Auburn, AL  United States  36830
• Authors:
  • Kandhal, P S
• Publication Date: 1992-5

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: 61 p.

Subject/Index Terms

• TRT Terms: Asphalt pavements; Compaction; Drainage; Dust; Forensic medicine; Hot mix asphalt; Moisture content; Problem identification; Problem solving; Stripping (Pavements); Test procedures; Tests
• Identifier Terms: American Association of State Highway and Transportation Officials
• Uncontrolled Terms: Moisture susceptibility
• Old TRIS Terms: Moisture susceptibility tests
• Subject Areas: Highways; Hydraulics and Hydrology; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00625361
• Record Type: Publication
• Report/Paper Numbers: NCAT 92-1,, QIP-119
• Files: TRIS, ATRI
• Created Date: Nov 19 2001 12:00AM