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Iowa DOT Developmental Specifications for Recycled Asphalt Shingles. Scott Schram, Ph.D., P.E. Iowa DOT Bituminous Engineer 5/26/2010. Outline. Background Specification Development Upcoming Projects. RAS Processing Models. RAS Processing Models. RAS Processing Models.

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iowa dot developmental specifications for recycled asphalt shingles

Iowa DOT Developmental Specifications for Recycled Asphalt Shingles

Scott Schram, Ph.D., P.E.

Iowa DOT Bituminous Engineer

5/26/2010

outline
Outline
  • Background
  • Specification Development
  • Upcoming Projects
jurisdiction
Jurisdiction

DOT

DNR

IDED

OSHA

dot specification development
DOT Specification Development
  • Source requirements
  • Material requirements
  • End User requirements
source requirements ras suppliers
Source Requirements: RAS Suppliers
  • Treated like aggregate producers
  • RAS comes as a CERTIFIED product to End User
  • Approved List for RAS Suppliers (each site)
    • Obtained necessary permits
    • Submit Quality Control Plan
  • Documentation and record keeping
material requirements
Material Requirements
  • Raw Shingle Material
    • Pre-processing = sorting, removal of waste
    • Asbestos remediation (testing, rejection of loads)
  • Processed RAS
    • Gradation
    • Deleterious Content (<1.5%)
    • Moisture (for information only)
quality control of ras
Quality Control of RAS
  • Code of Federal Regulations 637.201-637.209
  • RAS cannot be self-certified
  • QC Program Required
    • Minimum 3 samples or 1/1000 tons
    • Gradation, deleterious, moisture
  • DOT may verify results
end user requirements
End User Requirements
  • 2-5% of RAS must be used when the DS is on the contract
  • Future…….Permissive specification allowing 5% max
  • We pay for 2/3 of the extracted binder content in the RAS
  • End Users may not collect or process shingles at portable facilities.
other issues
Other issues
  • Sampling and testing logistics
    • Timing
  • Mix Design volumetrics
2010 projects
2010 Projects
  • HWY 63
    • HMA: 4% + RAP = 25% binder replacement (PG 58-28)
    • HMA: 5% + RAP = 30% binder replacement (PG 58-28)
    • HMA: Control with RAP
  • HWY 10
    • HMA: 4%, 5%, 6% with NO RAP (PG 58-28)
    • HMA: control with NO RAP (PG 64-22)
  • HWY 61
    • WMA: 5% + RAP = 30% binder replacement (PG 58-28)
    • WMA: 7% + RAP = 30% binder replacement (PG 58-28)
    • WMA: control with RAP only (PG 58-28)