9th ICAPCopenhagen

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9th ICAP-Copenhagen

• New Developments In
• Pavement Design
• Some Issues
• RPF-13,14 NOV 2002
• Morris De Beer
• CSIR Transportek

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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
  ( lt 25 mm to 15 mm)
• Back-Calculation - Rehab

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• 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.

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DESTINCT ELEMENT METHOD (DEM) FOR GRANULAR
MATERLS- 8TH / 9TH ICAP
Dr Per Ullidtz
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PERPETUAL Pavements lasting gt 50 years
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Macro-Model Differential heave-clay, ice
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Example Top Down Cracking Relevant to
SA/SADC ??.
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Cracking Top-Down-Bottom-Up ??- UK
10
CAPTIF-NZ- DYNAMIC LOADS
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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)
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FWD-Thailand-Denmark
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POOR CORRELATION BETWEEN BB (Rebound) and FWD
Ymax.(Thailand)
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Radius of Curvature (RoC)- HDM-IV (Greece/ ARRB).
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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)
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Full Scale Tests and Pressure Cells 72 km/h -
Virginia, USA
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Calibrating Subgrade Models during
Compaction-Using Pressure cells- Brazil
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Dr. Raj Siddharthan siddhart_at_unr.edu
UNIVERSITY OF RENO, NEVADA, SOFTWARE
3D-MOVE Strain VS speed
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Geo-synthetics in Soft Pavements- Design (NL)
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Equivalent Layer Thickness Approach New
Applications-Ullidtz
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Europe Amadeus-2000 (Francken, et al)
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Value of Deflection Coring
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VALUE OF DEFLECTION vs CORING- UK
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INTERFACE SHEAR- ROMANOSCHI, USA
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BORESCOPE FOR LAYER THICKNESS (Thailand)- view
layers in 22 mm dia hole, 650 mm deep
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NORWAY
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TWIN-LAYER FOR NOISE REDUCTION DENMARK
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FEM ILLI-PAVE (ILIPAV3C)-2002
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Tyre/Pavement Contact Stresses
Courtesy of http//www.Goodyear.com
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Non-Uniform Contact Pressure Sun Lijun, China
Simplified Modeling
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Non-Uniform Pressure Sun Lijun,
China. Simplified Modeling
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FEM EverFlex Seattle, Washington State, USA
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EverFlex Seattle, Washington State, USA
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FEM - BLAB/HARVEY-UCB, USA
FEAP CODE
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FEM - BLAB/HARVEY-UCB, USA AC Rutting
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FEM - RUTTING- HOSSIAN, USA
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FEM VISCO-ELASTIC-FRANCE
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FEM VISCO-ELASTIC- NETHERLANDS
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Finite Element Analysis (CSIR Defencetek)
UNIFORM

SIM-1
SIM-2
SIM-3

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ROUGNESS MODELS- Lenngren-Sweden
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THE END- Thank you !