Prevention of Stripping Under Chipseals - Phase II

Summary:

This multi-phased project investigates the stripping of asphalt pavement under chip seals that has been identified as a major concern for Minnesota cities and counties. Researchers studied stripping under chip seals: the loss of bond between binder and aggregate under chip seals in asphalt pavements. After conducting extensive field testing at 18 locations in Minnesota and performing laboratory tests on 280 asphalt cores, researchers found that air voids, asphalt mix design and construction practices are not the direct causes of this pavement distress. They concluded that stripping under chip seals is a complex phenomenon that cannot be addressed with a simple mix design or a construction practice. This study's extensive field and laboratory data will be valuable in future investigations. Further research is being planned to examine whether chip sealing is counterproductive as a maintenance practice.

Final Deliverables:

• Prevention of Stripping Under Chip Seals (Report #2017-35)
• Examining Possible Causes of Stripping in Asphalt Pavement Under Chip Seals (Research Summary)

Related Materials:

Related Research:

Project Personnel:

Principal Investigator:  Dave Rettner

Co-Principal Investigator:  Derek Tompkins

Technical Liaison:  Klayton Eckles, Tony Kutzke

Project Coordinator:  Bruce Holdhusen

Panel Members: 
Allen Hartleib - AET Engineering
Brandon Brever - Colorado Asphalt Paving Association
Dave Hanson - Bolton & Menk
Jennifer Levitt - City of Cottage Grove
Jill Thomas - MN Asphalt Pavement Association (MAPA)
Joel Ulring - Materials & Road Research
John Garrity - Materials & Road Research
John Gorder - City of Eagan
Marc Buelow - Commercial Asphalt
Marcus Culver - City of Brooklyn Park
Paul Oehme - City of Lakeville
Tim Becker - Sibley County
Zhanping You - Michigan Technological University