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Brief Introduction of Australian Pavement Design

Brief Introduction of Australian Pavement Design. Design Philosophy. Distribute the loads to the subgrade Provide for smooth, safe and efficient movement of vehicles. Design Philosophy. Pavement design

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Brief Introduction of Australian Pavement Design

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  1. Brief Introduction of Australian Pavement Design

  2. Design Philosophy • Distribute the loads to the subgrade • Provide for smooth, safe and efficient movement of vehicles

  3. Design Philosophy • Pavement design • most economical pavement composition to provide reliable service for expected traffic loading and environmental conditions

  4. Types of Pavements • Flexible pavements

  5. Types of Pavements • Rigid pavements • Continuously Reinforced • Plain Jointed • Dowel Jointed • Jointed Reinforced • Etc…

  6. AUSTROADS

  7. Subgrade • Classified in terms of CBR • Poor:  3 • Fair: 4 – 9 • Good:  10 • Need to consider swell (can exceed 7%)

  8. Subgrade • Soaking requirements • Based on environment (1 – 10 day) • 4 day most common • 10 day where wet • Generally subgrades very poor • Require careful attention • Fills

  9. Subgrade • Drainage very important • Maintain moisture regime in pavement

  10. Pavement materials

  11. PAVEMENT DESIGN

  12. Traffic loading

  13. Traffic loading • Concept of ESA (E80) • Developed further • HVAG • Parameters for design • HVAG/HV • ESA/HVAG • Determine damage “coefficient” for each material type • < 100 000 ESA to more than 700 million ESA X 4 ≠

  14. Damage “coefficient” • Determined from ALF • “Relative”/”equivalent” damage to pavement material by a HVAG • E.g cemented layers more sensitive to heavy loads

  15. Design: Subgrade

  16. Design: Thickness • Empirical design method (< 10 million ESA) • Mechanistic-Empirical design method (> 10 million ESA)

  17. Empirical design method

  18. Mechanistic-Empirical design method • Assign stiffness to pavement layers • Asphalt: 3000MPa depending on: • Traffic speed • temperature • Cemented: 2000 – 5000 Mpa • Granular: 150 to 500 Mpa • Subgrade: E=10.CBR • Sublayering of granular layers

  19. Mechanistic-Empirical design method • Calculation of critical stresses and strains (LE software) (750kPa, 4 circular loads) • Using transfer functions to predict performance • Subgrade rutting: Vertical strain at top • Cemented fatigue: Horizontal strain at bottom • Asphalt fatigue: Horizontal strain at bottom • Granular: currently none

  20. Mechanistic-Empirical design transfer functions

  21. Typical examples (QLD) • 450 million ESA with speed > 80 km/hr • 85 million ESA with speed ≤ 80 km/hr • 37 million ESA with speed > 80 km/hr • 23 million ESA • 10 million ESA with speed ≤ 30 km/hr

  22. 450 million ESA (v > 80km/h)

  23. 85 million ESA (v ≤ 80km/h)

  24. 37 million ESA (v > 80km/h)

  25. 23 million ESA

  26. 10 million ESA (v ≤ 30km/h) (ramp)

  27. Thank you

  28. 3.5 million ESA (urban)

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