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Title: EVALUATION OF VARIABLES AFFECTING FLEXIBLE PAVEMENT THAWING FOR TIMING SPRING LOAD RESTRICTIONS
Accession Number: 00607742
Record Type: Component
Availability: Find a library where document is available Abstract: A finite element analysis of pavement freezing and thawing was performed on four flexible pavement structures developed to represent typical pavements that receive spring load restrictions because of thaw weakening. The pavement structures consisted of 2- and 4-in.-thick asphalt concrete surface courses, 6- and 12-in.-thick granular base courses and fine- and coarse-grained subgrade materials. TDHC, a two-dimensional finite element heat transfer model, was used for the analysis. Air temperatures, short- and longwave radiation, and convection were included as the external variables driving the pavement thermal response. Latent heat caused by the phase change of water during freezing and thawing, is included in the model. The results suggest that average daily pavement surface-air temperature differences vary from 2 deg F in February to 11 deg F in May. These data suggest that pavement thawing will be initiated during this time for average daily air temperatures of 30 deg F or less. In addition, it was found for the pavements analyzed that thawing reached the top of the subgrade, after pavement surface temperatures reached 32 deg F, in 1 to 4 days in thin pavements and in 4 to 9 days in thick pavements. The duration of thawing for total thawing to occur was correlated with the freezing index for all subgrade types combined with satisfactory results.
Supplemental Notes: This paper appears in Transportation Research Record No. 1286, Design and Evaluation of Rigid and Flexible Pavements 1990. 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 #: 01411074
Authors: Rutherford, MaryPagination: p. 248-258
Publication Date: 1990
Serial: ISBN: 0309050707
Features: Figures
(7)
; References
(21)
; Tables
(5)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Design; Geotechnology; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I42: Soil Mechanics
Files: TRIS, TRB
Created Date: Apr 30 1991 12:00AM
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