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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. 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

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  1. Iowa DOT Developmental Specifications for Recycled Asphalt Shingles Scott Schram, Ph.D., P.E. Iowa DOT Bituminous Engineer 5/26/2010

  2. Outline • Background • Specification Development • Upcoming Projects

  3. RAS Processing Models

  4. RAS Processing Models

  5. RAS Processing Models

  6. RAS Processing Models

  7. Jurisdiction DOT DNR IDED OSHA

  8. DOT Specification Development • Source requirements • Material requirements • End User requirements

  9. 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

  10. 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)

  11. 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

  12. 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.

  13. Other issues • Sampling and testing logistics • Timing • Mix Design volumetrics

  14. 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)

  15. QUESTIONS?

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