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9 th ICAP-Copenhagen

9 th ICAP-Copenhagen. New Developments In Pavement Design – Some Issues RPF-13,14 NOV 2002 Morris De Beer CSIR Transportek. 9th ICAP-2002-Copenhagen, Denmark. TOPICS USED IN 122 PAPERS:. Pavements. Design. Rutting, Plastic. Models. Pavement Design. Rehabilitation. Finite Element.

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9 th ICAP-Copenhagen

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  1. 9th ICAP-Copenhagen New Developments In Pavement Design – Some Issues RPF-13,14 NOV 2002 Morris De Beer CSIR Transportek

  2. 9th ICAP-2002-Copenhagen, Denmark TOPICS USED IN 122 PAPERS: Pavements Design Rutting, Plastic Models Pavement Design Rehabilitation Finite Element Topic Linear Elastic Guidelines Fatigue Cracking Back calculation Contact Stress Thermal Cracking New Methods, Guid. Materials Design 0 10 20 30 40 50 60 70 80 90 100 110 120 Number of Papers on Topic

  3. PRE-CONFERENCE TUTORIALS ON PAVEMENT DESIGN: • Mechanistic Pavement Design: • General move from pure empirical to Mechanistic-Empirical (ME); • AASHTO 1993 Guide to new AASHTO 2002 (ME); • Thin to Ultra-Thin Layer Technology ( < 25 mm to 15 mm) • Back-Calculation - Rehab

  4. Dr Per Ullidtz :delivered the Fourth ISAP Distinguished Lecture entitled: • “Analytical Tools for Design of Flexible Pavements.” • Analytical-Empirical; • Simulation models: • Deterioration over time (MMOPP)- Incremental-recursive-Spatial variation; • DEM2D: Particulate media: resilient, plastic and failure in one process.

  5. DESTINCT ELEMENT METHOD (DEM) FOR GRANULAR MATERLS- 8TH / 9TH ICAP Dr Per Ullidtz

  6. PERPETUAL Pavements: lasting > 50 years

  7. Macro-Model: Differential heave-clay, ice

  8. Example: Top Down Cracking – Relevant to SA/SADC ??.

  9. Cracking: Top-Down-Bottom-Up ??- UK

  10. CAPTIF-NZ- DYNAMIC LOADS

  11. “Shake-down” theory

  12. Better use if WIM data- Belgium

  13. VALUE OF DEFLECTION vs CORING- UK: FOUNDATION TESTING : FWD and Dynamic Plate Bearing Test (DPBT)

  14. FWD-Thailand-Denmark

  15. POOR CORRELATION BETWEEN BB (Rebound) and FWD Ymax.(Thailand)

  16. Radius of Curvature (RoC)- HDM-IV (Greece/ ARRB).

  17. MODIFIED CBR METHOD FOR AIRCRAFT LANDING STRIPS

  18. SEMI-RIGID-EFFECTIVE FATIGUE – Belgium

  19. CAPTIF-NZ- DYNAMIC LOADS & “4TH Power Law” exp F = (Actual Load/Reference Load)

  20. Full Scale Tests and Pressure Cells: 72 km/h - Virginia, USA

  21. Calibrating Subgrade Models during Compaction-Using Pressure cells- Brazil

  22. Dr. Raj Siddharthan siddhart@unr.eduUNIVERSITY OF RENO, NEVADA, SOFTWARE: “3D-MOVE” Strain VS speed:

  23. Geo-synthetics in Soft Pavements- Design (NL)

  24. Equivalent Layer Thickness Approach: New Applications-Ullidtz

  25. Europe: Amadeus-2000 (Francken, et al)

  26. Value of Deflection & Coring

  27. VALUE OF DEFLECTION vs CORING- UK

  28. INTERFACE SHEAR- ROMANOSCHI, USA

  29. BORESCOPE FOR LAYER THICKNESS (Thailand)- [view layers in 22 mm dia hole, 650 mm deep]

  30. NORWAY

  31. TWIN-LAYER FOR NOISE REDUCTION: DENMARK

  32. FEM: ILLI-PAVE (ILIPAV3C)-2002

  33. Tyre/Pavement Contact Stresses Courtesy of: http://www.Goodyear.com

  34. Non-Uniform Contact Pressure: Sun Lijun, China: Simplified Modeling:

  35. Non-Uniform Pressure: Sun Lijun, China. Simplified Modeling:

  36. FEM: EverFlex: Seattle, Washington State, USA

  37. EverFlex: Seattle, Washington State, USA

  38. FEM - BLAB/HARVEY-UCB, USA FEAP CODE

  39. FEM - BLAB/HARVEY-UCB, USA: AC Rutting

  40. FEM - RUTTING- HOSSIAN, USA

  41. FEM – VISCO-ELASTIC-FRANCE

  42. FEM – VISCO-ELASTIC- NETHERLANDS

  43. Finite Element Analysis (CSIR Defencetek) UNIFORM SIM-1 SIM-2 SIM-3

  44. ROUGNESS MODELS- Lenngren-Sweden

  45. THE END- Thank you !

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