1. Recycling Tear-Off Shingles: Shingles to Streets
Dan Krivit Shingles Recycling Presentation to SWANA on
5/19/2019
Recycling Tear-Off Shingles: Shingles to Streets
A Presentation to the
MPCA
Air, Water and Waste Conference
February 16, 2006
Jason Haus, Dem-Con Companies And Dan Krivit, Dan Krivit and Associates
Draft as of

2. The Problem / Opportunity
300,000 to 400,000 tons of a valuable resource is being landfilled each year
If incorporated at 5% into hot-mix asphalt, could help produce 8 million tons of HMA
At $0.50 per ton of HMA, the value could be as much as $4 million per year

3. Why Is It Not Recycled? No Mn/DOT spec (yet)
Need “best management practices” guidelines
Willing private investors

4. Key Strategies for Tear-Offs
Develop a Mn/DOT spec
Develop a “best practices” guideline
Continue to demonstrate demand
Encourage private investments

5. Summer 2005 Project Dem-Con worked with Dan Krivit
Agreed to supply 60 Tons of clean tear-off shingles

6. OEA Project 2005 demonstration and lab study
Mixed roofing waste sorted by Dem-Con into clean asphalt shingles
Tear-off shingles ground and screened by Bituminous Roadways, Inc. (BitRoads) into RAS
BitRoads recycled RAS into HMA for paving on Dakota County Hwy 26 (70th Street)

7. OEA Project Objectives
Conduct HMA strength tests at U of M Civil Engineering asphalt lab
Conduct HMA grading tests at Mn/DOT Maplewood lab
Develop a sampling and testing protocol for any future lab studies

8. Other Projects
SWMCB
EPA / CMRA
Missouri
AASHTO

9. Asphalt Shingle Composition

10. Source: Ayres, April 2003.

11. List of Roofing Waste Items Excluded for Recycling “NO” (Do NOT include):
Wood
Metal flashings, gutters, etc
Nails (best effort)
Plastic wrap, buckets
Paper waste
No other garbage or trash

12. Engineering Questions:
How does tear-off derived HMA differ from manufacturer HMA? From RAP only?
What are the key variables: shingle asphalt? Aging on the roof? Fiber content?
What is a tolerable amount of deleterious debris? How is deleterious defined?

13. Testing Questions:
Can mix design be better adjusted based on actual binder performance?
Relative impact of 20% vs. 5%?
Can shingles be pre-blended with RAP before entry into HMA plant?

14. Economic Questions:
Can tear-off suppliers meet the strict quality standards?
Will regular environmental testing be required?
How close can recyclers get to 100% removal of nails?
What is the true effective value of the RAS in HMA? Can RAS become a recognized HMA modifier?

15. OEA Project Status
Dem-Con sorted into clean asphalt shingles only in July
BitRoads processed shingles into RAS in September
BitRoads paved with tear-off derived HMA in October
U of M and Mn/DOT labs are currently conducting tests

16. Video Clips of OEA Project Operations
Dem-Con sorting
BitRoads processing into RAS
BitRoads recycling into HMA and paving
Bormann Construction - source separate tear-off shingles from roofing project site

17. Dan Krivit Shingles Recycling Presentation to SWANA on 12-7-05
5/19/2019
Strategic Questions:
Mn/DOT spec?
Role of State and counties?
Business model for tear-offs?
Role of MAPA?
Various depending on the player / role:
Mn/DOT spec: timing and content
Other government responsibilities: Regulation, R&D, policy. SWMCB lead?
Business model for tear-offs: HMA producer driven? C&D company driven? Aggregate / RAP producer driven? Independent?
Should MAPA play a role? Can MAPA play a role?
Draft as of

18. Summary
Tear-off shingles recycling is feasible from technical, economic and environmental perspectives
Still in research and development stage here in Minnesota
Has been implemented in several other states for many years

19. Summary (continued) Need to complete OEA project
Encourage Mn/DOT to proceed with a spec for tear-offs
Need to complete EPA project
Continue to strengthen an already strong public-private partnership

20. Construction Materials Recycling Association (CMRA)

21. Thanks to private partners:
Bituminous Roadways, Inc.
Pace Construction
Dem-Con
Peerless Resource Recovery
Bormann Brothers Construction
Total Home Maintenance

22. Thanks to agency partners:
Dakota County
OEA
Mn/DOT
U of M
MoDOT
SWMCB / Ramsey County