Title: AN IMPROVED CALIFORNIA BEARING RATIO TEST PROCEDURE
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.
Publication Year: 1987
Publication Date: 1987-01-01
Language: en
Type: article
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Cited By Count: 6
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