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<br />Technical Report Documentation Page <br />1. Report No. 2. 3. Recipients Accession No. <br />MN/RC 2017-35 <br />4. Title and Subtitle 5. Report Date <br />Prevention of Stripping under Chip SealsSeptember2017 <br />6. <br />7. Author(s)8. Performing Organization Report No. <br />David L. Rettner and Derek Tompkins <br />9. Performing Organization Name and Address 10. Project/Task/Work Unit No. <br />American Engineering Testing, Inc. <br /> <br />550 Cleveland Ave N <br />11. Contract (C) or Grant (G) No. <br />St Paul, Minnesota 55114 <br />(C) 1027053 <br />12. Sponsoring Organization Name and Address 13. Type of Report and Period Covered <br />Minnesota Local Road Research Board Final Report <br />Minnesota Department of Transportation <br />14. Sponsoring Agency Code <br />Research Services & Library <br /> <br />395 John Ireland Boulevard, MS 330 <br />St. Paul, Minnesota 55155-1899 <br />15. Supplementary Notes <br />http:// mndot.gov/research/reports/2017/201735.pdf <br />16. Abstract (Limit: 250 words) <br />Eighteen chip-sealed roadways in eight cities and counties in Minnesota were evaluated both in the field (for <br />condition surveys and density tests) and in the laboratory (for permeability, stripping, tensile-strength ratio, <br />asphalt film thickness, and mix properties) to evaluate factors associated with stripping in asphalt pavements <br />under chip-seal treatments. Analysis of the test data did not support an earlier MnDOT finding that high air voids <br />were a cause of stripping under chip seals. For those locations that did exhibit stripping, the test data did not <br />support a direct relationship between asphalt pavement density and stripping. In addition, the research did not <br />determine a direct relationship between incidence of stripping and site/supplier data (e.g., bituminous mixture, <br />contractor, geographic location, or year of construction). This observation agreed with observations made by <br />Minnesota city/county engineers. An additional outcome of the research is the large amount of testing data <br />developed, which is documented fully in appendices to the final report. <br />17. Document Analysis/Descriptors18. Availability Statement <br />asphalt pavements, seal coating, chip seals, stripping No restrictions. Document available from: <br />(pavements), pavement maintenance National Technical Information Services, <br />Alexandria, Virginia 22312 <br />19. Security Class (this report) 20. Security Class (this page) 21. No. of Pages 22. Price <br />Unclassified Unclassified 165 <br /> <br />