Summary of 3rd Asphalt Shingles Recycling ForumAs of 12-18-2007
The stiffness results indicate that the addition of tear-off RAS material increases the stiffness of the mixtures at all test temperatures.
The strength results indicate that the strength properties were not significantly affected by the addition of shingles.
U of MN, Dept. of Civil Engineering asphalt lab tests on HMA sample, gyratory “pucks” as provided by Pace Construction, St. Louis, Missouri
20% reclaimed asphalt pavement (RAP), and
15% RAP + 5% Tear-off recycled asphalt shingles (RAS)
(Note: Both mixtures contained the same virgin asphalt binder PG 54-22.)
Dr. Tuncer Edil, University of Wisconsin – Madison 608-262-3552,
Implications of particle size characteristics
Strength, stiffness and compactibility
Strength enhancements of aggregate-RAS mixtures using cementitious fly ash
Develop guidelines regarding the use of RAS in roadway construction (pavement, aggregate base, aggregate subbase, embankment fill and subgrade)
Roger Olson, Minnesota Department of Transportation 651-366-5517,
Mn/DOT has completed several field and laboratory studies over the last 15 years using RAS in HMA applications.
Current specification allows use of up to 5% manufacturers’ shingle scrap
Use of tear-off RAS is being reviewed on a project by project basis and requires approval by the engineer.
Next Steps: examine feasibility of using tear-off shingle scrap in HMA applications
Tom Shanahan, National Roofing Contractors Association 847-299-9070,
Impediments to roofing contractors recycling shingles:
Location of recycling facility
Requirements for “clean” tear-off shingles
Homeowners continue to inquire about recycling
Area’s reporting improvement over last few years (WI,OR,SC,NC)
NRCA can help
Promote recycling chain
Encourage recycling efforts in legislative arenas
Partner with manufacturers, recyclers and others
Vince Brulinski, GAF-ELK Corporation 410-935-3664;
The median age of the U.S. housing stock is 34+ years
Prepared by ShingleRecycling.org and DKAPage 5 of 11