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Title: AN IMPROVED CALIFORNIA BEARING RATIO TEST PROCEDURE
Accession Number: 00468621
Record Type: Component
Availability: Find a library where document is available Abstract: The California bearing ratio (CBR) test is one of the most common strength tests conducted to evaluate subgrade quality of soils and the suitability of soils for subbase and base courses in pavements. Yet there are variations in the procedures used by various transportation agencies; this results in confusion among highway engineers. To improve the existing CBR procedures, an alternative method has been employed successfully to obtain CBR-values of soil and to evaluate the moisture susceptibility of soils. This method is not only easier to perform but also requires less effort because only four samples need be compacted and tested. There are also fewer sources of error in that obtaining the "correct" optimum moisture content for compaction is not required because the test is considered an extension of the compaction tests (i.e., AASHTO T99 and T180). This method has been used successfully on various soil types as well as on soil-cement mixtures. The possibilities of, and the potential for obtaining additional data by, this improved procedure should make it an attractive alternative option and possibly the standard method for determining CBR. Finally, it could be used as a tool in evaluating the frost susceptibility of subgrade soils and subbase and base course materials, studies of which are presently being pursued by the authors.
Supplemental Notes: Publication of this paper sponsored by Committee on Exploration and Classification of Earth Materials. 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 #: 01418086
Authors: Pagination: pp 91-97
Publication Date: 1987
Serial: ISBN: 0309044723
Media Type: Print
Features: Figures
(4)
; References
(7)
; Tables
(4)
TRT Terms: Uncontrolled Terms: Subject Areas: Geotechnology; Highways; I42: Soil Mechanics
Files: TRIS, TRB, ATRI
Created Date: May 31 1988 12:00AM
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0000-0002-5204-9493