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.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1968/239/239-004.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Flexible Pavement Design and presented at the 47th Annual Meeting Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved..
• 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:
  • Highway Research Record
  • Issue Number: 239
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Age; Asphalt concrete; Bearing capacity; Benkelman beam; Building materials; Construction management; Deflection; Deflection tests; Design; Environmental impacts; Equations; Pavement design; Pavement performance; Pavements; Rebound; Stiffness; Subgrade (Pavements); Thickness; Traffic
• Identifier Terms: AASHO Road Test
• Uncontrolled Terms: Design criteria
• Old TRIS Terms: Pavement deflection; Soil support value; Thickness design
• Subject Areas: Construction; Design; Environment; Highways; Operations and Traffic Management; Pavements;

Filing Info

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