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Minnesota’s Experience in Implementing the Use of

Shingles

Roger OlsonResearch Operations EngineerMinnesota Dept. of Transportation

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History in MN Based onManufacturers’ Shingle Scrap

• Mn/DOT and U of MN lab tests (Newcomb, 1993)

• Willard Munger Trail (1990)

• Hwy 25 south of Mayer, MN (1991)

• Scott County Hwy 17South of Shakopee, MN (1991)

• Hennepin County France Avenue (2002)

• U.S. Highway 10 – (2006)

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TH 25 Test Section

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First Mn/DOT SpecAdopted in 1996

• Allowed 5% recycled asphalt shingles (RAS)

• Allowed in wear and non-wear courses

• Job-by-job approval by Project Engineer required

• Added like recycled asphalt pavement (RAP)

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Mn/DOT Spec “Guidelines” (circa 2000)

• On file with Bituminous Office

• Contaminants must be removed

• Certification of supply required

• Manufactured waste only

• Mn/DOT to certify suppliers

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• Mn/DOT specification 2360/2350 – 5% manufacturers RAS allowed- approval now permissive (2004 spec change)

• Virgin asphalt binder must be70% or greater of total in HMA(2006 spec change)

Spec Implementation

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Tear-off Shingle Pilot Projects

• City of St. Paul (2003)

• Dakota County / OEA Lab Study (2005 – 2006)

• Hassan / Omann (2006)

• Ramsey County Lower Afton Trail (2007)

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Ramsey County LAT Project:Tear-off Shingle Spec

• Funded in part by Mn/DOT State Aid

• County approached Mn/DOT

• Specification was drafted by Mn/DOT with guidelines

• Ramsey County reviewed and approved specification

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On–Going Research

• Minnesota SWMCB – Mn/DOT“Technical Working Group”

• Research Grant from Mn/PCA ($50,000)

• Future Mn/DOT Participation inFederal / State Pooled Fund Study

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