New Developments in Pavement Desi

Document Sample
New Developments in Pavement Desi Powered By Docstoc
					  9th 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
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
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
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.
DESTINCT ELEMENT METHOD (DEM)
FOR GRANULAR MATERLS- 8TH / 9TH ICAP




     Dr Per Ullidtz
PERPETUAL Pavements: lasting > 50 years
Macro-Model: Differential heave-clay, ice
Example: Top Down Cracking –
   Relevant to SA/SADC ??.
Cracking: Top-Down-Bottom-Up ??- UK
CAPTIF-NZ- DYNAMIC LOADS
“Shake-down” theory
Better use if WIM data- Belgium
VALUE OF DEFLECTION vs CORING- UK:
  FOUNDATION TESTING : FWD and
   Dynamic Plate Bearing Test (DPBT)
FWD-Thailand-Denmark
POOR CORRELATION BETWEEN BB
 (Rebound) and FWD Ymax.(Thailand)
Radius of Curvature (RoC)- HDM-IV
          (Greece/ ARRB).
MODIFIED CBR METHOD FOR AIRCRAFT
          LANDING STRIPS
SEMI-RIGID-EFFECTIVE FATIGUE –
Belgium
CAPTIF-NZ- DYNAMIC LOADS & “4TH Power Law”




                                             exp
 F = (Actual Load/Reference Load)
Full Scale Tests and Pressure Cells: 72 km/h
              - Virginia, USA
 Calibrating Subgrade Models during
Compaction-Using Pressure cells- Brazil
Dr. Raj Siddharthan siddhart@unr.edu   UNIVERSITY OF RENO, NEVADA, SOFTWARE: “3D-MOVE”


Strain VS speed:
Geo-synthetics in Soft Pavements- Design (NL)
Equivalent Layer Thickness Approach:
      New Applications-Ullidtz
Europe: Amadeus-2000 (Francken, et al)
Value of Deflection & Coring
VALUE OF DEFLECTION vs CORING- UK
INTERFACE SHEAR- ROMANOSCHI, USA
        BORESCOPE FOR LAYER THICKNESS
(Thailand)- [view layers in 22 mm dia hole, 650 mm deep]
NORWAY
TWIN-LAYER FOR NOISE REDUCTION:
           DENMARK
FEM: ILLI-PAVE (ILIPAV3C)-2002
Tyre/Pavement Contact Stresses




         Courtesy of: http://www.Goodyear.com
Non-Uniform Contact Pressure: Sun Lijun,
     China: Simplified Modeling:
Non-Uniform Pressure: Sun Lijun, China.
        Simplified Modeling:
FEM: EverFlex: Seattle, Washington State, USA
EverFlex: Seattle, Washington State, USA
FEM - BLAB/HARVEY-UCB, USA


                             FEAP CODE
FEM - BLAB/HARVEY-UCB, USA:
         AC Rutting
FEM - RUTTING- HOSSIAN, USA
FEM – VISCO-ELASTIC-FRANCE
FEM – VISCO-ELASTIC- NETHERLANDS
Finite Element Analysis (CSIR Defencetek)

  UNIFORM                                   SIM-1




   SIM-2                                    SIM-3
ROUGNESS MODELS- Lenngren-Sweden
THE END- Thank you !

				
DOCUMENT INFO
Shared By:
Categories:
Stats:
views:22
posted:2/20/2010
language:English
pages:45