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Task 4

Task 4. Beth Comes. Task 4-Development of FDR Mix Design Guide. The objective of this task is to develop a mix design procedure for the various types of FDR. Each type of FDR has separate mix design: Unstabilized Stabilized FDR with Portland Cement Stabilized FDR with Fly Ash

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Task 4

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  1. Task 4 Beth Comes

  2. Task 4-Development of FDR Mix Design Guide • The objective of this task is to develop a mix design procedure for the various types of FDR. • Each type of FDR has separate mix design: • Unstabilized • Stabilized FDR with Portland Cement • Stabilized FDR with Fly Ash • Stabilized FDR with Asphalt Emulsion • Stabilized FDR with Asphalt Emulsion with 1% Lime • Stabilized FDR with Foamed Asphalt with 1% Portland Cement

  3. Testing Material • For Unstabilized FDR, four levels: 25, 50, 75% virgin material and 100% virgin materials as the control • 5 - points moisture density curves for Unstabilized, Stabilized with PC, and Stabilized with Fly Ash • 5 levels of stabilizer (PC, Fly Ash, Emulsion, Emulsion + Lime, Foamed Asphalt + PC) • Lime content for Emulsion + Lime stabilizer is constant: 1.0 % Lime • PC content for Foamed Asphalt + PC stabilizer: 1.0 % (if failed given conditions, use 2.0% PC)

  4. Timeline • Foamed Asphalt with PC – approx November 1st • Asphalt Emulsion – approx December 1st • Emulsion with 1% Lime – approx January 1st

  5. CBR

  6. Sample Moisture Density Curve

  7. SPT Machine

  8. Resilient Modulus • Similar to Task 3 • Main Difference for Task 4 • A uniform section is used in the stress calculations for the resilient modulus

  9. Pavement Configuration for Stress Analysis

  10. Mr Results from SPT Machine

  11. Compressive Strength

  12. Sample Compressive Strength 302 psi

  13. Split Tensile Passing: Strength ≥ 40 psi

  14. Moisture Sensitivity

  15. Sample Tube Suction

  16. Pass/Fail Criteria Moisture Sensitivity • Tube Suction (passing) • Average dielectric reading for the last 3 days < 10 • Soaked Strength ≥ 75% Unsoaked Strength • Moisture Conditioning (passing) • Split tensile strength ≥ 25 psi

  17. Foamed Asphalt

  18. Gyratory Compactor

  19. Corelok (Bulk Density)

  20. Acknowledgements • Dr. Bang, Professor SDSM&T • Dr. Roberts, Assistant Professor SDSM&T • Dr. Sebaaly, UNR • Dan Johnston, SDDOT • Wade Lein, SDSM&T • Mike deStigter, SDSM&T • Leah Nehl, SDSM&T • Shaun Herrod, SDSM&T

  21. Questions?

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