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Delamination of Chip Seals and Structural Damage

This presentation discusses the delamination of chip seals from roadways and the resulting structural damage in underlying layers. It highlights the problem, existing research, and current activities to address the issue. The discussion points include mechanisms, construction issues, guidance for prevention, and alternative treatments.

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Delamination of Chip Seals and Structural Damage

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  1. Delamination of Chip Seals and Structural Damage Andrew Hanz ETF Meeting The Center, Heritage Research Group June 12, 2019

  2. Problem • Numerous instances of delamination of chip seals from roadway after 1 to 5 years in service. • Structural damage observed in underlying layers. • Not a new problem • “Prevention of Stripping Under Chip Seals” MnDOT Research http://dot.state.mn.us/research/reports/2017/201735.pdf • Local agencies are following guidance to perform maintenance and not seeing expected results.

  3. STH 77 Between Danbury and MN/WI State Line • Observations: • Is this a construction issue? • Distress is midlane, possibly due to paver segregation.

  4. County Highways in Central WI • County was confident in underlying structure. Performed mill and fill or pulverize/relay ~2011 and chip sealed a few years later. • Based on issues with these two projects, suspended chip seal program for 2019.

  5. CTH F in NW WI • Picture on Left is indicative of stretches over the entire road. • (Poor) picture on right shows seal picking up from core. Underlying layer was stripped and unstable.

  6. Current Activities • Actively Monitoring and Researching Sections • Binder Properties of the seal and underlying layers. • Stability of underlying layers using mix performance test (IDEAL). • Intended Outcome • Agencies have recognized the problem and are asking two questions: • 1) What can be done to fix the current roadway. The answer is most likely mill & fill. • 2) How can this be prevented in the future?

  7. Discussion Points • Is this issue being observed in other areas? • What are the mechanisms? • Chip seals being applied to roads that shouldn’t be rehabilitated. • Issues with construction (i.e. segregation) or performance (cracking) that are introducing moisture into the pavement. Once sealed the moisture has nowhere to go. • What guidance can be given to agencies to prevent this problem? • What to look for? • Alternative treatments?

  8. Thank You! Andrew Hanz andrew.hanz@mteservices.com

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