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Moisture Induced Stress Testing (MIST) to Evaluate Stripping Potential of HMA Pavements

Moisture Induced Stress Testing (MIST) to Evaluate Stripping Potential of HMA Pavements. AASHTO RAC/TRB 2013 Summer Meeting. Work completed by Rajib Mallick at WPI Prepared by Dale Peabody dale.peabody@maine.gov. Why was the research performed?.

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Moisture Induced Stress Testing (MIST) to Evaluate Stripping Potential of HMA Pavements

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  1. Moisture Induced Stress Testing (MIST) to Evaluate Stripping Potential of HMA Pavements AASHTO RAC/TRB 2013 Summer Meeting Work completed by Rajib Mallick at WPI Prepared by Dale Peabody dale.peabody@maine.gov

  2. Why was the research performed? • MaineDOT uses Hot Mix Asphalt pavement only – AND IT’S FALLING APART!!!

  3. Why was the research performed? • HMA pavements pass the Superpave criteria • Concerns with aggregate quality, excessive dust & liquid asphalt quality • Existing method for moisture susceptibility AASHTO T283, doesn’t catch our poor performers

  4. What We Did • Sampled Cores from one and two year old HMA projects • Condition core samples in MIST • Visual observations and testing on non-conditioned cores and conditioned cores

  5. What we found… MIST equipment provides a better tool for helping to ID poor performers.

  6. RESULTS

  7. RESULTS

  8. Hamburg Wheel Tester

  9. CONCLUSIONS AND RECOMMENDATIONS • 1. MIST conditioned samples can ID poor performers • 2. The effects of MIST conditioning should be studied further to develop standards • 3. Coupled with the newly acquired Hamburg Wheel Tracker Device, can identify poor performing mix designs

  10. Benefits • MIST equipment can be used immediately to help ID potential poor performers • MaineDOT to consider adopting MIST and save taxpayers $$$’s • Specification changes can be driven by test data

  11. The People Part of the Program • We assigned two relatively new Department employees to lead the research. They didn’t have preconceived ideas, yet!! • We had confidential meetings with paving contractors to ask why thought pavements were failing. They provided some thought provoking answers.

  12. The People Part of the Program • We shared our research with industry as we progressed. We asked for their input along the way. • We promised not to make major paving specification changes unless we could show results. • However, we expected industry to support changes to specifications if we documented issues.

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