Use of CBR mould for evaluation of constrained modulus-bulk stress relations of pavement structure materials
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Author list: Dararat S., Kongkitkul W.
Publication year: 2017
Journal: International Journal of GEOMATE (2186-2982)
Volume number: 12
Issue number: 32
Start page: 107
End page: 113
Number of pages: 7
ISSN: 2186-2982
Languages: English-Great Britain (EN-GB)
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Abstract
One of important parameters used in the mechanistic pavement engineering design is resilient modulus (MR) of pavement structure materials. In general, MR is evaluated in a complicated and thus expensive triaxial compression test in that a number of repeated loads are applied at various stress states. This research presents an alternative method to determine the constrained modulus (M) of a dried sand, a lateritic soil and a crushed rock, under one-dimensional compression. At various vertical stress levels, M values were determined by applying small strain-amplitude cyclic loadings to the compacted soil specimens prepared in a CBR mould. In the present study, the CBR mould was made special in that it can measure the lateral stress confining to the specimen during a test. Hence the bulk stress (θ) can then be determined, and M-θ relations for the tested materials were presented. In addition, an analytical method for eliminating the effects of bedding error was attempted so as to obtain the true M value. It is found that M is not constant but increases with θ, similar to MR-θ relations found with the resilient modulus test. In addition, the bedding error is important and can result in a significant underestimation of the true M value. © Int. J. of GEOMATE.
Keywords
Bedding error, Coefficient of lateral earth pressure, Constrained modulus, Pavement structure materials, resilient modulus
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