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OGFC and GTR Trial Projects

OGFC and GTR Trial Projects . Melissa L. Campbell State Materials Engineer SCDOT Office of Materials & Research. Background. Currently SCDOT uses Open Graded Friction Course on our Interstate system PG 76-22 binder with SBS polymer modification

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OGFC and GTR Trial Projects

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  1. OGFC and GTR Trial Projects Melissa L. Campbell State Materials Engineer SCDOT Office of Materials & Research

  2. Background • Currently SCDOT uses Open Graded Friction Course on our Interstate system • PG 76-22 binder with SBS polymer modification • Fibers added to the mix to promote film thickness and lessen drain down of asphalt

  3. OGFC Concerns • OGFC • Construction Issues • Cold Joints • Bridge Tie-ins • Durability Issues • Raveling

  4. Current Condition I-20

  5. Reasons for Test Sections • GTR • Potential for use during SBS shortages • Cost Savings • Both GTR & Warm Mix • Ability to eliminate fibers • No Track tack • Improved raveling resistance

  6. Types of Trials • OGFC • Warm Mix without fibers • Using Evotherm 3G warm mix additive • Ground Tire Rubber Modified PG 76-22 • Also without Fibers • Conventional OGFC placed with trackless tack • Surface Type A • Ground Tire Rubber Modified PG 76-22

  7. Project Locations • I-20 Aiken County • One mile section using trackless tack • Reeves is Contractor • I-20 Kershaw County • 2 one mile sections using GTR • 2 one mile sections using Warm Mix • Sections will include: • A cold joint and a hot joint • A bridge tie in • Sloan is Contractor

  8. Project Locations • I-77 Fairfield & Chester Counties • GTR in Surface Type A and in OGFC • Contractor proposal • Boggs is contractor

  9. I-77 With GTR Surface Type A

  10. Surface Texture of GTR Surface Type A

  11. Questions?

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