HMA Longitudinal Joint Deterioration Investigation

Quarterly Reports Other Documents Final Report
Final Report

Primary Investigator

Awad Hanna
1415 Engineering Drive
2314 EH
Madison, WI 53706


In 2005, WisDOT adopted a notch-wedge type joint as the standard method of constructing longitudinal joints in HMA pavements. This change was based on an internal WisDOT research project that determined that these joints performed best on a 10-year study. During the past few years, WisDOT has observed an increase in the occurrence of deterioration of the longitudinal joints on HMA pavements, especially during the first 3 years of the pavements’ service life. This deterioration is leading to increased maintenance on these pavements and potentially a shortened service life.

WisDOT would like to initiate a study to determine if construction methods are contributing to the increased deterioration, and if so, are there changes that can be made to the current specifications to eliminate, or reduce, the occurrence of the deterioration.


The objective of this project is to review both good and poor performing notch-wedge longitudinal joints constructed in HMA pavements, determine if any conclusions can be made as to the possible causes of the deterioration and make recommendations for changes to the current WisDOT specifications to eliminate or reduce the deterioration.


  1. Literature search.
  2. Survey WisDOT regions to obtain a list of projects
  3. Survey development
  4. Examine PIF and do limited pavement condition reviews
  5. Analyze data
  6. Develop recommendations
  7. Prepare final report

Project Information

  • Duration: 17 months
  • Dates: January 1, 2010 – June 1, 2011
  • Budget: $35,490
  • Student Involvement: One graduate student
  • Modal Orientation: Highway
  • Project ID: CFIRE 04-26
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