Iowa DOT Developmental Specifications for Recycled Asphalt Shingles

Iowa DOT Developmental Specifications for Recycled Asphalt Shingles

Outline �Background �Specification Development �Upcoming Projects

RAS Processing Models Recycling Facility Roof • Removal • Pre-Sorting • • Collection Pre-sorting (mixed loads) Asbestos Testing Grinding & Sizing End User • HMA Contractor

RAS Processing Models Roof • Removal • Pre-Sorting Transfer Station • Collection • Pre-sorting (mixed loads) • Asbestos Testing Recycling Facility • Grinding & Sizing End User • HMA Contractor

RAS Processing Models Roof • Removal • Pre-Sorting Transfer Station • Collection • Pre-sorting (mixed loads) • Asbestos Testing End User • Grinding & Sizing

RAS Processing Models Roof • Removal • Pre-Sorting • • End User Collection Pre-sorting (mixed loads) Asbestos Testing Grinding & Sizing

Jurisdiction Roof • Pre-Sorting Transfer Station • Collection • Pre-sorting (mixed loads) • Asbestos Testing Recycling Facility • Grinding & Sizing • QC Testing • Deleterious % • Moisture % • Gradation End User • HMA Contractor • Material Properties • HMA Requirements DOT DNR IDED OSHA

DOT Specification Development 1. Source requirements 2. Material requirements 3. End User requirements

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 �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 �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 � 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 �Sampling and testing logistics �Timing �Mix Design volumetrics

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)

HMA Contractors RAS Suppliers Agency

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