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Title: ROADWAY PERFORMANCE IN AN EXPANSIVE CLAY
Accession Number: 00470964
Record Type: Component
Availability: Find a library where document is available Abstract: The performance of three pavement designs with expansive clay subgrade is presented. The pavements have been subjected to extensive warping attributed to differential swelling of the underlying soil. The purpose of this paper is to evaluate the effectiveness of the three designs in reducing warping, and to provide suggested alternative designs. The study focuses on pavements west of Dallas, Texas, situated over weathered shale of the Eagle Ford geologic formation. The weathered shale is highly expansive with heaving in excess of 12 in. being recorded. Postconstruction heave is attributed to increase in the soil moisture regime over time. Pavement warp occurs primarily in deep cut areas where the finished grade lies near or below the original zone at which soil moisture was stable and was not influenced by seasonal fluctuations. Data indicate that the overall movement of the pavements studied was upward. Differential vertical movements caused warping. The differential movement is attributed to the influence of: (a) underground utilities; (b) micro and macro soil structure features; (c) drainage; (d) patterns of water migration; and (e) stress release. The study evaluates the performance of three specific pavements. Subgrade treatments used to minimize potential movements included removal and replacement with lime stabilized soils and inert fills, and maintaining positive drainage. Alternative subgrade treatment by preswelling is discussed. Modification of pavement shoulders and base to account for shrinkage and loss of bearing support is a necessary component of preswelling design. Preswelling and suggested base and shoulder modifications are compared to current design techniques used in the area on an economical basis.
Supplemental Notes: Publication of this paper sponsored by Committee on Environmental Factors Except Frost. 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 #: 01418180
Authors: Reed, Ronald FPagination: pp 36-41
Publication Date: 1987
Serial: ISBN: 0309045134
Media Type: Print
Features: Figures
(7)
; Photos
(1)
; References
(11)
; Tables
(2)
TRT Terms:
Alternatives analysis; Benefit cost analysis; Calcium oxide; Drainage; Expansive clays; Fills; Measures of effectiveness; Pavement design; Pavement performance; Public utilities; Reduction (Chemistry); Soil stabilization; Soil structure; Soil water; Subgrade (Pavements); Swelling; Swelling soils; Warpage
Uncontrolled Terms: Old TRIS Terms: Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology; Pavements; I42: Soil Mechanics
Files: TRIS, TRB, ATRI
Created Date: Aug 31 1988 12:00AM
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