DESIGN OF PAVEMENTS USING DEFLECTION EQUATIONS FROM AASHO ROAD TEST RESULTS

THE STRUCTURAL PERFORMANCE WAS INVESTIGATED OF SOME SATELLITE PAVEMENTS IN THE PIEDMONT REGION OF VIRGINIA AND THICKNESS EQUIVALENCY VALUES WERE EVALUATED OF MATERIALS USED ON THE BASIS OF AASHO ROAD TEST RESULTS. MODEL EQUATIONS SUGGESTED BY THE AASHO ROAD TEST COMMITTEE FOR DESIGNING PAVEMENTS INVOLVE VARIABLES WHICH COULD NOT BE APPLIED TO VIRGINIA BECAUSE OF DIFFERENCES IN: (1) CONSTRUCTION TECHNIQUES, (2) TYPE OF MATERIALS USED, (3) SUBGRADE PROPERTIES, (4) ENVIRONMENTAL CONDITIONS, (5) TYPE AND DURATION OF TRAFFIC, AND (6) AGE OF PAVEMENT. TWENTY PROJECTS WITH VARYING PAVEMENT STRUCTURES WERE CHOSEN FOR STUDY TO EVALUATE THE THICKNESS EQUIVALENCY VALUES OF THE DIFFERENT MATERIALS IN THE PAVEMENTS' SYSTEMS, AND TO CORRELATE THESE VALUES WITH THE PAVEMENT PERFORMANCE ALONG WITH THE VARIABLES OF SOIL SUPPORT, TRAFFIC, AND AGE. CONCLUSIONS OF THE INVESTIGATION INDICATE THAT: (1) THE STRUCTURAL PERFORMANCE OF THE PAVEMENTS CAN BE EVALUATED FROM REBOUND DEFLECTION OR CURVATURE, OR LONGITUDINAL CROSS- SECTIONAL AREA OF THE DEFLECTED BASIN, OBTAINED FROM THE BENKELMAN BEAM DATA, (2) SUBGRADE SOIL STRENGTH, WHEN DETERMINED BY THE VIRGINIA CBR METHOD CANNOT BE CORRELATED WITH SUBGRADE SOIL SUPPORT VALUES GIVEN BY THE AASHO COMMITTEE, (3) ASSUMING THICKNESS EQUIVALENCY VALUE OF ASPHALTIC CONCRETE AS EQUAL TO 1.0, THICKNESS EQUIVALENCY VALUES COULD BE CONSIDERED FOR DESIGN IN VIRGINIA WITH THE LAYERS PLACED IN THE ORDER DESCRIBED, (4) THE TOLERABLE DEFLECTION OF A PAVEMENT IS A FUNCTION OF ITS RIGIDITY, AND (5) THE METHOD USED IN VIRGINIA IS SUITABLE FOR DESIGN BUT COULD BE MADE MORE FLEXIBLE USING A NOMOGRAPH FOR THICKNESS INDEX DETERMINATION AND A DESIGN BASED ON THICKNESS EQUIVALENCY VALUES.

  • Digital Copy:
  • Supplemental Notes:
    • Paper sponsored by Committee on Flexible Pavement Design and presented at the 47th Annual Meeting.
  • Authors:
    • Vaswani, N K
  • Discussers:
    • Campen, W H
    • Erickson, L G
    • Vaswani, N K
  • Publication Date: 1968

Media Info

  • Media Type: Print
  • Features: Appendices; Figures; References; Tables;
  • Pagination: pp 76-94
  • Monograph Title: Design and performance of pavement systems
  • Serial:

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Filing Info

  • Accession Number: 00205731
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jan 31 1994 12:00AM