1 / 21

Bituminous Roadways, Inc.

Bituminous Roadways, Inc. Bituminous Roadways, Inc. Asphalt paving contractor Founded in 1946 Three permanent asphalt plants Serve the Minneapolis/St. Paul metro area. Eight Years of Shingle Recycling Experience. 800,000 tons of finished hot-mix asphalt produced with shingles added

kaden
Download Presentation

Bituminous Roadways, Inc.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Bituminous Roadways, Inc.

  2. Bituminous Roadways, Inc • Asphalt paving contractor • Founded in 1946 • Three permanent asphalt plants • Serve the Minneapolis/St. Paul metro area

  3. Eight Years of Shingle Recycling Experience • 800,000 tons of finished hot-mix asphalt produced with shingles added • About $500,000 in savings due to avoided raw material costs

  4. History of BRI’s shingle recycling 1996 • MNDOT specs first allow 5% ground shingles (manufacturer’s scrap), with project engineer’s approval • First contract with CertainTeed Corp. of Shakopee • Maxigrind and Finlay screen used for processing • First use of ground shingles in hot mix

  5. 1997 • First OEA market development grant • Shredder, hammermill, and Powerscreen used for processing • Maxigrind burns up

  6. 1998 Two Maxigrinds and Finlay screen used for processing

  7. 2000 • Two Maxigrinds and trommel screen used for processing • A series of cold-mixed field tests for lightweight pavement: • 100% ground shingles • Ground shingles + crushed concrete mix • Ground shingles + RAP mix

  8. 2001 • Second OEA market development grant • ‘The Beast’ grinder made by Bandit Industries and trommel screen used for processing • Field demonstration at SKB’s Rosemount landfill as dust control: • Ground shingle + RAP mix • Ground shingle + crushed concrete mix

  9. 2002 • Positive news media coverage for projects in Hennepin and Scott Counties • Air testing performed to evaluate potential risk of asbestos. No risks detected due to dust or fiber

  10. 2003 • MNDOT changes the wording in their scrap shingle specification to be less restrictive (allow HMA producers discretion to use shingles)

  11. 2003: “Tear-Off” demonstration • In City of St. Paul • 50 tons of ground, tear-off shingles in HMA • Certified sourcing of residential roofing scrap from: • Sela Roofing (roofing contractor) • Armor Waste (hauling, sorting and transfer) • Nails removed by magnet on “The Beast”

  12. 2003: “Tear-Off” demonstration (cont’d) • Side-by-side installation: • 5% tear-off vs. • 5% manufactured shingle scrap • No performance difference • Tear-offs seem easier to grind, but requires additional effort to remove nails and staples

  13. Current Mn/DOT Specification • Shingles used must be scrap from shingle manufacturers only  No tear-offs (yet). • Sources must be certified • Gradation of ground shingle scrap: • 100% passing the ¾” sieve, and • At least 95% passing the #4 sieve • Maximum of 5% by weight allowed

  14. Processing and Handling • Grinding has very high wear on equipment • Low production at about 20 tons per hour • Extended storage of ground shingles results in re-agglomeration (chunking) • Grind during the paving season (just-in-time for HMA production)

  15. Processing and Handling • Shingle scrap must be free from other debris to protect grinder • We grind to ½-inch minus gradation • Water helps with cooling and controlling dust • Shrouding equipment further helps with controlling dust • Feed ground shingles into our asphalt plants through standard recycle bins

  16. Economics • Goal: The cost of processing = The disposal (tipping) fee • Offer a savings to our mix production

  17. Experience With Use of Ground Shingles • Less than 50% of the asphalt in the shingles is effective in the mix • Use of ground shingles has not been detrimental to quality  Cannot yet prove that ground shingles offers improved quality to our mix

  18. Specific Projects • France Avenue – Hennepin County • County Road 42/83 – Scott County • 19th Avenue No. – City of South St. Paul • Highway 13 – Mn/DOT • Various residential street reconstruction projects – City of St. Paul

  19. The Future • Consider blending ground shingles with sand or RAP for storage • New wording in state specifications should allow for more use – set record in 2003 • Tear-offs • Other applications (dust control, additive to aggregate base)

  20. For more information, contact: • Dusty Ordorff, Bituminous Roadways(612) 366-2765DustyO@bitroads.com • Dan Krivit(6510 489-4990DKrivit@bitstream.net

  21. Summary of Past Research Mn/DOT & RMRC April 10, 2003 Forum: www.projects.dot.state.mn.us/uofm/shingles

More Related