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Flexible Pavement Design Methods Heuristic Methods (early 1900s) - PowerPoint PPT Presentation

Jun 14, 2023 •542 likes •822 views

Flexible Pavement Design Methods Heuristic Methods (early 1900s) Empirical Based on Soil Class (1920s) Empirical Based on Soil Strength (1930s) Limiting Shear Stress (1940s) Limiting Deflection (1950s) Regression-Based

  1. Flexible Pavement Design Methods • Heuristic Methods (early 1900s) • Empirical Based on Soil Class (1920s) • Empirical Based on Soil Strength (1930s) • Limiting Shear Stress (1940s) • Limiting Deflection (1950s) • Regression-Based (1960s) • Mechanistic-Empirical (21 st Century) Wednesday, August 29 1 CIVL 7166

  2. 7133 Earth Structures • Analysis, design, and construction of earth dams, levees, embankments and slopes; soil stabilization; seepage, drainage, and flow nets. Wednesday, August 29 2 CIVL 7166

  3. Rigid Pavement Design Methods • 1919 – Goldbeck’s Formula • 1926 – Westergaard’s Equations • 1951 – Pickett’s Equations • 1965 – Finite Element Methods • 1979 – ILLI-SLAB • 1981 – WESLIQUID & WESLAYER • 1985 – KENSLABS Wednesday, August 29 3 CIVL 7166

  4. Road Tests • Bates Road Test (rigid & flexible) • Maryland Road Test (rigid) • WASHO Road Test (flexible) • AASHO Road Test (flexible & rigid) • WesTrack (flexible) • NCAT Test Track (flexible) • SHRP LTPP (flexible & rigid) Wednesday, August 29 4 CIVL 7166

  5. AASHO Road Test Source: Highway Research Board Special Report 61A-G Wednesday, August 29 5 CIVL 7166

  6. CIVL 7166 AASHO Road Test 6 Wednesday, August 29

  7. AASHO Road Test Source: Highway Research Board Special Report 61A-G Wednesday, August 29 7 CIVL 7166

  8. AASHO Road Test Source: Highway Research Board Special Report 61A-G Wednesday, August 29 8 CIVL 7166

  9. AASHO Road Test Source: Highway Research Board Special Report 61A-G Wednesday, August 29 9 CIVL 7166

  10. AASHO Road Test Source: Highway Research Board Special Report 61A-G Wednesday, August 29 10 CIVL 7166

  11. AASHO Road Test Source: Highway Research Board Special Report 61A-G Wednesday, August 29 11 CIVL 7166

  12. AASHO Road Test Source: Highway Research Board Special Report 61A-G Wednesday, August 29 12 CIVL 7166

  13. CIVL 7166 WesTrack 13 Wednesday, August 29

  14. CIVL 7166 WesTrack 14 Wednesday, August 29

  15. CIVL 7166 WesTrack 15 Wednesday, August 29

  16. CIVL 7166 NCAT Test Track 16 Wednesday, August 29

  17. NCAT Test Track Source: Better Roads , November 2006 Wednesday, August 29 17 CIVL 7166

  18. CIVL 7166 NCAT Test Track 18 Wednesday, August 29

  19. CIVL 7166 SHRP LTPP 19 Wednesday, August 29

  20. Pavement Design Factors • Traffic • Materials – Axle Loads – Elastic Modulus – Contact Pressure – Poisson’s Ratio – Load Repetitions – Resilient Modulus – Vehicle Speed – Creep Compliance – Fatigue Life • Environment – Subgrade Reaction – Temperature – Modulus of Rupture – Moisture – Strength – Freeze/Thaw Wednesday, August 29 20 CIVL 7166

  21. Failure Criteria • Flexible Pavements – Fatigue Cracking in Asphalt – Rutting in Asphalt and Base – Permanent Strain in Subgrade – Thermal Cracking in Asphalt • Rigid Pavements – Fatigue Cracking in Slab – Permanent Strain in Subgrade Wednesday, August 29 21 CIVL 7166

  22. Highway vs. Airport • Load Magnitudes • Load Durations • Contact Pressures • Traffic Volume • Tracking / Wander • Gear Configurations • Edge Effects Wednesday, August 29 22 CIVL 7166

  23. CIVL 7166 Highway Wander 23 Wednesday, August 29

  24. CIVL 7166 Airport Wander 24 Wednesday, August 29

  25. Gear Configurations Wednesday, August 29 25 CIVL 7166

  26. Dual Wheel – Single Axle Wednesday, August 29 26 CIVL 7166

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