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Title: FIELD EVALUATION OF CONSTRUCTION ALTERNATIVES FOR ROADWAYS OVER SOFT SUBGRADE
Accession Number: 00930565
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: Alternative methods for providing a stable platform over soft subgrades were evaluated using a 1.4-km section along a Wisconsin State highway that incorporated 12 test sections to evaluate 9 different stabilization alternatives. A variety of industrial by-products and geosynthetics were evaluated for stabilization. The industrial by-products included foundry slag, foundry sand, bottom ash, and fly ash as subbase layer materials. The geosynthetics included geocells, a nonwoven geotextile, a woven geotextile, a drainage geocomposite, and a geogrid. The same pavement structure was used for all test sections except for the subbase layer, which varied depending on the properties of the alternative material being used. All test sections were designed to have approximately the same structural number as the conventional pavement structure used for the highway, which included a subbase of granular excavated rock. Observations made during and after construction indicated that all sections provided adequate support for the construction equipment and no distress was evident in any part of the highway. Each of the alternative stabilization methods, except a subbase prepared with foundry sand, appear to provide equivalent or greater stiffness than that provided by control sections constructed with excavated rock. However, the foundry sand subbase is providing adequate support. Analysis of leachate collected from the base of the test sections shows that the by-products discharge contaminants of concern at very low concentrations.
Supplemental Notes: This paper appears in Transportation Research Record No. 1786, Geology and Properties of Earth Materials 2002.
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Edil, T BBenson, C HBin-Shafique, M STanyu, B FKim, W-HSenol, APagination: p. 36-48
Publication Date: 2002
Serial: ISBN: 0309077117
Features: Figures
(12)
; Photos
(3)
; References
(11)
; Tables
(2)
TRT Terms: Uncontrolled Terms: Geographic Terms: Subject Areas: Geotechnology; Highways; I42: Soil Mechanics
Files: TRIS, TRB, ATRI
Created Date: Sep 17 2002 12:00AM
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