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Evaluating the Effect of Coarse Rubber Particles on Asphalt Concrete Mixtures

Evaluating the Effect of Coarse Rubber Particles on Asphalt Concrete Mixtures. James K. Laicovsky Laura C. Miller Amanda R. Zimmerman. The 18 th International Conference on Solid Waste Technology and Management Philadelphia, PA March 25, 2003. Outline of Presentation. The Tire Problem

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Evaluating the Effect of Coarse Rubber Particles on Asphalt Concrete Mixtures

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  1. Evaluating the Effect of Coarse Rubber Particles on Asphalt Concrete Mixtures James K. Laicovsky Laura C. Miller Amanda R. Zimmerman The 18th International Conference on Solid Waste Technology and Management Philadelphia, PA March 25, 2003

  2. Outline of Presentation • The Tire Problem • Superpave • Project Scope • Results

  3. Waste Tires Total ~ 300 Million Tires ~2.5 Million Tons

  4. Commercial & Industrial Residential Scrap Tires = 1.5% Solid Waste in the U.S.

  5. Solution

  6. Recent Projects Washington Northeast 85% of scrap tires are located in -- Connecticut, New York, Pennsylvania , Ohio, Michigan, Colorado, Virginia, Texas, and Alabama. Tennessee Arizona Texas

  7. Superpave • SUperior PERforming Asphalt PAVEments • Strategic Highway Research Program • New techniques to specify, test, and design

  8. Rubber Analysis Gradation Manipulation Rubber Substitution Specimen Fabrication Specimen Testing Fine-Tune Rubber Substitution Project Scope

  9. Good Mix Bad Mix Bad Mix Good Mix Gradation Manipulation Desired Superpave Gradation Curve Percent Passing Sieve Size.45

  10. Rubber Analysis ¾” Rubber Particles #4 Rubber Particles #12 Rubber Particles

  11. Substituted Rubber into Original Superpave Gradation 0.5% - 5.0% Rubber Substitution Rubber Particles

  12. Specimen Fabrication

  13. Gyratory Compactor 1.25° Specimen Fabrication

  14. GC Data Compaction Height, cm Gyration, N

  15. GC Data Analysis Area = ½(H1-H2)(log100-log1) H1 Slope = k k Air voids at 100 gyrations Lower the number, softer mix 1 H2 0 100 Log (Number of Gyrations)

  16. GC Data Plot Compaction Height, cm Log (Number of gyrations), N

  17. Results Area Under “k” Curve vs. Rubber Substitution Area Under “k” Curve Rubber Substitution, %

  18. Analysis • 4% rubber substitution uses: • 60 tons of GTR ~ 7,600 tires/lane mile • Rubber cost ~ $10,000/lane mile

  19. Analysis • 4% rubber substitution reduces: • 780 tons of aggregates ~ $156,000 savings/lane mile Savings of $146,000/lane mile

  20. Conclusions • Improved rutting performance. • Potentially useful with NJ aggregates. • Continued investigation to determine optimal substitution percentage.

  21. Web Site http://engineering.rowan.edu/~mill2633/rowan_rubber.htm

  22. QUESTIONS?

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