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Shingles Recycling: Quality Assurance / Quality Control PowerPoint Presentation
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Shingles Recycling: Quality Assurance / Quality Control

Shingles Recycling: Quality Assurance / Quality Control

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Shingles Recycling: Quality Assurance / Quality Control

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  1. Shingles Recycling:Quality Assurance / Quality Control A Presentation at theSacramento RMRC Workshop on Tuesday, April 11, 2006 Presenter: Dan KrivitDan Krivit and Associates

  2. Recycled MaterialsResource Center www.rmrc.unh.edu

  3. Presentation Outline [Modified from presentation already in your big books! Make sure to get all additional inserts: • AASHTO spec • Bibliography • SWMCB packet

  4. Material Introduction

  5. Definitions • Manufacturers’ Asphalt Shingle Scrap • Tear-Off Asphalt Shingle Scrap • Recycled Asphalt Shingles (RAS)(Crushed & screened)

  6. History • 15 years + • Multiple research studies in lab and field • Manufacturer shingle scrap in hot-mix asphalt best known, most accepted practice • Still relatively new application

  7. Engineering Properties

  8. Composition of Residential Asphalt Shingles

  9. Recent Composition Weight Ranges of Typical Asphalt Shingles • 32 to 42% Coating filler (limestone or fly ash) • 28 to 42% Granules (painted rocks & coal slag) • 16 to 25% Asphalt • 3 to 6% Back dust (limestone or silica sand) • 2 to 15% Mat (fiberglass, paper, cotton rags) • 0.2 to 2% Adhesives (modified asphalt based)

  10. Applications and Performance

  11. Multiple Applications [Most Proven] • HMA • Aggregate (gravel) • Dust control • Cold patch • Ground cover • Fuel • New shingles

  12. Factors Affecting HMA Performance • Aggregate gradation of RAS • Properties of final blended binder content within the HMA as affected by: • RAS asphalt binder • Virgin binder

  13. Factors AffectingHMA Performance(continued) • Location RAS is incorporated into HMA • Temperature • Moisture content of RAS and other aggregates • Retention time in HMA drum

  14. Engineering Performance Advantages • Reduce need for virgin binder • Add fibrous reinforcement • Modify PG grade binder High temp performance • Reduce landfill needs 3-11

  15. Potential Benefits *(* Manufacturers’ RAS) • Cracking resistance • Rutting resistance • Conservation of landfill space Source: Paul Lum, Lafarge Construction Materials Ltd., April 13, 2003.

  16. Challenges • Need for improved grinding and handling • Blending and storage • Continued research into engineering effects of RAP and RAS on AC binder content • Quality control and quality assurance

  17. BarrierstoShingleRecycling • Economic reasons • Policy and regulatory compliance • Environmental concerns • Technical reasons • Public sentiment ----------- (Note: These barriers may be real or perceived!)

  18. Engineering Performance Disadvantages • Hotter mix requirements • Stiffer mix • Possible contamination (Justus, September 2004) 3-12

  19. Asphalt Shingles in HMAMissouri DOT Experience Joe Schroer, PE Construction and Materials Division March 30, 2005

  20. In The Beginning • Approached by Pace Construction and Peerless Landfill • MoDOT Not Using RAP in Mixtures • Deleterious Material • Stiffness of Asphalt in Shingles

  21. Why Should We Pursue Shingles? • High Asphalt Content • Granules Are Hard and Durable • Recycling CO$T

  22. Concerns • How Will Deleterious Material Affect the Mixture • Can the Low Temperature Grading be Maintained at Various Blending Ratios

  23. Asphalt After Blending with Shingle Asphalt • Resist Rutting • Resist Fatigue Cracking • Resist Cold-Weather Cracking

  24. Asphalt Grades • High Temperature for Rut Resistance • Low Temperature for Fatigue and Cold Weather Performance Performance Graded = PG PG 64-22 (PG Sixty-four Minus Twenty-two) High Temp 64°C (147°F) Low Temp –22°C (-8°F)

  25. Asphalt Modifications Require PG 64-22 • Stiffer at High Temperature – OK • Stiffer at Low Temperature • Use Lower Percentage of Shingles • Use Softer Roadway Asphalt

  26. Deleterious Evaluation • Specification for Aggregate • 0.5% “Other Foreign Material” • Sticks, mud balls, deer fur, etc. • Shingle “OFM” • Approximately 3% Total

  27. Nails Wood Plastic Cellophane Paper Fiber Board Deleterious Material

  28. No Difference • Visually • Standard Mixture Tests • Placement

  29. Can Tear-Off Shingles be Used? • Allowance in OFM Due to Small Percentage of Shingles and Trial Mixture • Start with Softer Roadway Asphalt

  30. Where Are We?The “Ex” Factor 2 • Extrinsic Material Allowance Raised • 3.0% Total • 1.5% Wood • Expect PG 64-22 met w/ PG 58-28 • Extra grades optional w/ testing • Examining various proportions and asphalts • Exuberant Contractors

  31. U of M Lab Data:Missouri Samples • Prof. Mihai Marasteanu,U of M Dept. of Civil Engineering • Preliminary results as of 4-6-2006 • Report with Mn/DOT lab data to be released soon

  32. MO: Mix Stiffness @ 100sec. (PG 64-22)

  33. MO: Mix Stiffness @ 100sec. (PG 58-28)

  34. MO: Mix Stiffness @ 500sec. (PG 58-28)

  35. MO: Tensile Strength (PG 64-22)

  36. MO: Tensile Strength (PG 58-28)

  37. Mn/DOT lab data • Jim McGraw, Director of Mn/DOT’s Chemical Lab, Maplewood, MN • Preliminary lab data as of Thursday, April 6, 2006 • Report with U of M lab data, including Mo/DOT samples, to be released soon

  38. New Minnesota Lab Study • Funded by OEA • Co-sponsored by Mn/DOT • Comparing manufacturer RAS to Tear-Off RAS • Mn/DOT to conduct PG extractions • U of M Civil Engineering to conductindirect tensile strength tests

  39. MN: Asphalt Content of RAS

  40. U of M Lab Data:Minnesota Samples • Prof. Mihai Marasteanu,U of M Dept. of Civil Engineering • Preliminary results as of Thursday, April 6, 2006 • Report with Mn/DOT lab data to be released soon

  41. MN: Mix Stiffness [GPa] @ 100 sec. 16 13.5 20% RAP 15% RAP + 5% Tear-off 12 15% RAP + 5% Manufactured 10.0 8.2 8 Stiffness [GPa] 5.5 5.0 4 2.7 0.5 0.2 0.2 0 0 -10 -20 o Temperature [ C]

  42. MN: Mix Stiffness [GPa] @ 500 sec.

  43. MN: Tensile Strength [MPa]

  44. MN vs. MO: Mix Stiffness [GPa] @ 100 sec.

  45. MN vs. MO: Mix Stiffness [GPa] @ 500 sec.

  46. States Using RAS

  47. (Justus, September 2004)

  48. Western States • California • Montana • Texas • Oregon

  49. Other States’ Specifications[and Experiences]

  50. Minnesota • Manufacturing Shingle Waste Only • 100% passing the ½ inch Sieve • Maximum of 5.0% RAS permitted • Gradation meet the requirements of the mix design • Performance grade of virgin asphalt binder based on the properties of the shingle asphalt binder • No limits on deleterious materials or asbestos (Justus, September 2004)