DESIGNING FLEXIBLE PAVEMENTS (VIRGINIA)
THE DESIGN OF FLEXIBLE PAVEMENTS IN VIRGINIA IS BASED ON THE CALIFORNIA BEARING-RATIO METHOD (C.B.R.) WITH CERTAIN MODIFICATIONS. SINCE THE STATE SPECIFICATIONS REQUIRED THAT ALL FILLS AND SUBGRADES BE COMPACTED TO 95 PERCENT OF THEORETICAL DENSITY AS DETERMINED BY AASHO METHOD T-99, THE SPECIMENS WERE TESTED AT THIS DENSITY. THE TEST SPECIMENS WERE COMPACTED USING 45 BLOWS OF THE 5 1/2-LB. COMPACTION RAMMER. ALL SAMPLES WERE SOAKED FOR FOUR DAYS. ALONG WITH THE VALUES OBTAINED FROM THE MODIFIED TEST PROCEDURE, THE ANTICIPATED TRAFFIC LOADS ARE ALSO USED IN THE DESIGN DEPTH OF THE PAVEMENT. THIS METHOD OF DESIGN HAS BEEN USED FOR ALL TYPES OF CONSTRUCTION INCLUDING RECONDITIONING OF ALL PAVEMENTS, NEW LOCATIONS, AND ONES WHERE BOTH MINOR AND MAJOR CHANGES ARE MADE IN GRADES AND ALIGNMENT. ON MANY OF THE RECONDITIONING PROJECTS IT HAS BEEN FOUND THAT MANY SECTIONS OF THE OLD ROAD HAVE TO BE COMPLETELY RECONSTRUCTED, WHILE IN OTHER SECTIONS ONLY A NEW SURFACE WILL HAVE TO BE APPLIED. ON NEW LOCATIONS, IN MANY CASES, IT IS NECESSARY TO PLACE BETTER MATERIALS TO DEPTHS AS GREAT AS 24 INCHES BEFORE PLACING THE SUBBASE AND PAVEMENT. IN OTHER INSTANCES, WHERE CERTAIN GRADES HAVE TO BE MAINTAINED, IT HAS BEEN NECESSARY TO EXCAVATE TO DEPTHS AS GREAT AS 48 INCHES AND BACKFILL WITH SELECT MATERIAL OF A KNOWN C.B.R. VALUE BEFORE CONSTRUCTING THE PAVEMENT. THE IDEA BEHIND THE DESIGN METHOD IS TO PROVIDE A UNIFORM SUBGRADE ON WHICH TO PLACE A UNIFORM DEPTH OF PAVEMENT THAT WILL SUPPORT ANTICIPATED LOADS WITH A MINIMUM AMOUNT OF DEFLECTION IN THE PAVEMENT. RESULTS HAVE BEEN SATISFACTORY. /AUTHOR/
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Supplemental Notes:
- 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.
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Corporate Authors:
Highway Research Board (HRB)
Washington, DC -
Authors:
- Woodson, D D
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Conference:
- 33rd Annual Conference of the Highway Research Board
- Location: Washington District of Columbia, United States
- Date: 1954-1-12 to 1954-1-15
- Publication Date: 1954
Media Info
- Media Type: Digital/other
- Features: Figures;
- Pagination: 3p
- Monograph Title: Design of Flexible Pavements
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Serial:
- Highway Research Board Research Reports
- Issue Number: 16B
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Base course (Pavements); California bearing ratio; Compaction; Flexible pavements; Pavements; Subbase (Pavements); Thickness
- Uncontrolled Terms: Base; Pavement thickness; Subbase
- Subject Areas: Highways; Pavements;
Filing Info
- Accession Number: 00205967
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: May 22 1972 12:00AM