Agenda - Council - 02/24/2020 - Laserfiche WebLink

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Bituminous Pavement Stripping Research Findings City of Ramsey February 20, 2020 Findings and Practices of other Cities • Andover o Moving away from sealcoating streets. o Collects funds for first crackseal of new streets from developers. • Anoka o Sealcoat AND fog seal all streets. o Crackseal streets one year before applying sealcoat/fog seal. • Brooklyn Park o Streets constructed before 1990's did not experience pavement stripping. o Mill and overlay improvements completed in mid-1990's to early-2000's. Pavement stripping was observed after. o Stripping often starts at intersections, but once it starts it will continue to progress. o Don't do spot repairs. Mill and overlay entire streets to repair. o Quit sealcoating streets 2 years ago. o Do not rejuvenate streets. • Coon Rapids o Administers Northwest Metro Pavement Management Group (JPA). o Planning to try faster curing fog seal emulsion offered by FHR this year (CQS-1hd50). o Crack fill only applied to MSA streets. o Crack fill and fog seal only applied to local streets. o No sealcoating in 2020. • Saint Michael o Stripping under sealcoats observed since early 2010's. o Stopped sealcoating streets in 2014. o Applying Reclamite to wear course (new and overlays) < 3 years old since 2017. • Woodbury o Stripping under sealcoats observed since late 2000's. o Stopped sealcoating streets around 2009. o Replaced around 85 miles of residential street pavement since 2014. o Adopted new mix design per MnDOTTech Memo 17-sa-01. o Applying Reclamite to new wear course within 1 year. General Comments and Observations • Stripping issues observed more often after the second sealcoat. • Once stripping is observed it continues to expand. • Freeze thaw cycles accelerate stripping. • Based on weather trends, northern climates should expect to experience increased; o Rain events each winter, resulting in greater saturation of pavements o Freeze -thaw events each winter • Mill and infill effectively repairs stripping damage if done before progressing into base course. • Pavement rejuvenators (Reclamite, Replay, Fahrner, etc.); o Penetrate into pavements roughly 3/8-inch o Replaces maltenes in oxidized pavements o Effectively seals pavement surfaces o Numerous U.S. cities have used for decades, including Chicago Page 1 of 2