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Title: A CRITICAL REVIEW OF PRESENT KNOWLEDGE OF THE PROBLEM OF RATIONAL THICKNESS DESIGN OF FLEXIBLE PAVEMENTS
Accession Number: 00205423
Record Type: Component
Abstract: THE HYPOTHESIS THAT FLEXIBLE PAVEMENTS ARE PERFECTLY ELASTIC APPEARS TO BE VALID FOR LIMITED NUMBERS OF SAFE LEADS OF SHORT DURATION. HOWEVER, FOR SLOW-MOVING OR STATIC LEADS LARGE ENOUGH NEARLY TO OVERSTRESS THE PAVEMENT, A RHEOLOGICAL MODEL IS MORE APPLICABLE. PAVEMENT LAYERS LACKING TENSILE STRENGTH MAY ACCOUNT FOR A LARGE PART OF THE DIFFERENCE BETWEEN CALCULATED AND MEASURED DEFLECTIONS AND STRESSES. THERE MAY BE MERIT IN USING AN EQUIVALENT MODULUS OF ELASTICITY FOR THE SYSTEM. ALTHOUGH POISSONS RATIO HAS LITTLE EFFECT ON CALCULATED STRESSES, A VALUE OF 0.5 SEEMS TO BE APPROPRIATE FOR SOILS AND PAVEMENTS. THE DEFLECTION FACTOR IS IMPORTANT IN RELATION TO THE EFFECT OF PAVEMENT RIGIDITY ON PAVEMENT DEFLECTIONS. THE LAYERED SYSTEM MODEL OF FLEXIBLE PAVEMENTS SHOULD INCLUDE THE CONDITION OF ZERO TENSILE MODULUS OF THE COMPONENT MATERIALS. /RRL/
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
Monograph Title: Monograph Accession #: 01410031
Authors: De Barros, S ThennPagination: pp 105-128
Publication Date: 1965
Serial: Media Type: Print
Features: Figures
(7)
; References
(35)
; Tables
(2)
TRT Terms: Old TRIS Terms: Subject Areas: Highways; Pavements
Files: TRIS, TRB
Created Date: Dec 12 1994 12:00AM
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