APPLICATION OF EQUIVALENT-LAYER-THICKNESS CONCEPT IN A MECHANISTIC REHABILITATION DESIGN PROCEDURE
The South African mechanistic rehabilitation design procedure is well established and has been verified with the help of a fleet of heavy vehicle simulators. Surface deflection basins can be measured with the road surface deflectometer or the National Institute for Transport and Road Research deflectograph. Typical South African pavement structures were analyzed, and various deflection basin parameters were calculated. The equivalent-layer-thickness (ELT) concept was investigated for its applicability to this analysis procedure and was found to be useful in representing the structural capacity of a pavement. The basis for the calculation of the ELT is the effective elastic modulus of the subgrade. Deflection points measured on the extremes of the deflection basin are used to calculate the subgrade effective elastic modulus. Various deflection basin parameters can be used to calculate pavement ELT, which can be related to typical distress determinants or directly to remaining life in a design-curve approach.
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Availability:
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Supplemental Notes:
- This paper appears in Transportation Research Record No. 1207, Pavement Design. 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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Authors:
- Horak, Emile
- Publication Date: 1988
Media Info
- Features: Figures; References; Tables;
- Pagination: p. 69-75
- Monograph Title: Pavement design
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Serial:
- Transportation Research Record
- Issue Number: 1207
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Coefficient of subgrade reaction; Defects; Deflection; Design; Driver rehabilitation; Mechanical analysis; Mechanistic design; Pavement distress; Pavement layers; Pavements; Service life; Thickness; Traffic equivalence factor
- Uncontrolled Terms: Rehabilitation
- Geographic Terms: South Africa
- Old TRIS Terms: Pavement deflection; Pavement life
- Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;
Filing Info
- Accession Number: 00490202
- Record Type: Publication
- ISBN: 03090477730
- Files: TRIS, TRB, ATRI
- Created Date: Dec 31 1989 12:00AM