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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

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bituminous roadways inc1
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
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
history of bri s shingle recycling
History of BRI’s shingle recycling


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

Two Maxigrinds and Finlay screen used for processing

  • 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
  • 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
  • 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
  • MNDOT changes the wording in their scrap shingle specification to be less restrictive (allow HMA producers discretion to use shingles)
2003 tear off demonstration
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”
2003 tear off demonstration cont d
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
current mn dot specification
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
processing and handling
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)
processing and handling1
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
  • Goal: The cost of processing = The disposal (tipping) fee
  • Offer a savings to our mix production
experience with use of ground shingles
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
specific projects
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
the future
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)
for more information contact
For more information, contact:
  • Dusty Ordorff, Bituminous Roadways(612)
  • Dan Krivit(6510
summary of past research
Summary of Past Research

Mn/DOT & RMRC April 10, 2003 Forum: