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 () can then be determined, and M- 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 , similar to MR- 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.
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