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Bituminous Pavement Stripping Research Findings <br />City of Ramsey January 16, 2020 <br />Findings and Practices of other Cities <br />• Andover <br />o Moving away from sealcoating streets <br />o Collects funds for first crackseal of new streets from developers <br />• Anoka <br />o Sealcoating AND fog sealing all streets <br />o Cracksealing streets one year before sealcoating/fog sealing <br />• Brooklyn Park <br />o Significant stripping issues since early 2010's <br />o More input will be obtained January 17 <br />• Coon Rapids <br />o Administers Northwest Metro Pavement Management Group (JPA) <br />o Planning to try faster curing fog seal emulsion offered by FHR this year (CQS-1hd50) <br />o Crack filling only applied to collector streets (no sealcoats) <br />o Sealcoating only applied to local streets <br />o Fog sealing only applied to cul-de-sacs <br />• Saint Michael <br />o Stripping issues experienced since mid-2010's. <br />o Stopped sealcoating streets 4 years ago. <br />o Applying Reclamite to streets with wear course (new and overlays) < 2 years old. <br />• Woodbury <br />o Stripping issues first experienced in late 2000's. <br />o Stopped sealcoating streets around 2009. <br />o Replaced around 85 miles of residential street pavement since 2014 <br />o Adopted new mix design per MnDOT Tech Memo 17-sa-01 <br />o Applying Reclamite to all new pavement within 1 year <br />General Comments and Observations <br />• Stripping issues are observed more often after the second sealcoat. <br />• Once stripping is observed it continues to expand. <br />• Freeze thaw cycles accelerate stripping. <br />• Based on weather trends, northern climates should expect to experience increased; <br />o Rain events each winter, resulting in greater saturation of pavements <br />o Freeze -thaw events each winter <br />• Mill and infill is effective to repair stripping damage if done before stripping progresses into <br />pavement base course. <br />• Pavement rejuvenators (Reclamite, Replay, etc.); <br />o Penetrate into pavements roughly 3/8-inch <br />o Replace maltenes in oxidized pavements <br />o Effectively seal pavement surfaces <br />o Numerous U.S. cities have used for decades, including Chicago <br />Local Road Research Board (LRRB) Pavement Stripping Research Conclusions and Recommendations <br />• 2013-08 Stripping of Hot -Mix Asphalt Pavements under Chip Seals (Wood & Cole, MnDOT) <br />o Conclusions: Stripping of HMA pavement after application of chip seal caused by areas <br />of high air voids or low density. <br />Page 1 of 2 <br />