9th ICAP-2002-Copenhagen, Denmark

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Materials Design

New Methods, Guid.

Thermal Cracking

Contact Stress

Back calculation

Fatigue Cracking

Guidelines

Linear Elastic

Finite Element

Rehabilitation

Pavement Design

Models

Rutting, Plastic

Design

Pavements

Topic

Number of Papers on Topic

TOPICS USED IN 122 PAPERS:

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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

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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 > 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

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CAPTIF-NZ- DYNAMIC LOADS

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“Shake-down” theory

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Better use if WIM data- Belgium

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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

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SEMI-RIGID-EFFECTIVE FATIGUE –

Belgium

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CAPTIF-NZ- DYNAMIC LOADS & “4TH Power Law”

F = (Actual Load/Reference Load) exp

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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@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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Courtesy of: http://www.Goodyear.com

Tyre/Pavement Contact Stresses

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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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UNIFORM SIM-1

SIM-2 SIM-3

Finite Element Analysis (CSIR Defencetek)

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ROUGNESS MODELS- Lenngren-Sweden

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THE END- Thank you !

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