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Title: Prediction of resilient modulus of compacted saprolitic soils by CBR approach for road pavement subgrade : a re-examination
Authors: Leung, GLM
Wong, AWG
Wang, YH 
Keywords: California Bearing Ratio
completely decomposed granite
moisture ratio
resilient modulus
saprolitic subgrade soils
unconfined compressive strength
Issue Date: 2013
Publisher: Taylor & Francis Ltd
Source: International journal of pavement engineering, 2013, v. 14, no. 4, p. 403-417 How to cite?
Journal: International Journal of Pavement Engineering 
Abstract: The scope of the study as presented in this paper is to re-examine the prediction of resilient modulus (M r) by the classical California Bearing Ratio (CBR) approach, specifically for compacted saprolitic subgrade soils. Through the extensive experiments carried out for this research, a more precise model yielded to estimate M r based on CBR values and the relative degrees of soil compaction. Likewise, comments are also made critically for the suitability of using the well-known models which were developed during the past decades. In addition to the core results, this study has produced a number of other important findings: (1) the influence of soil compaction densities on CBR and M r is relatively significant when soil is relatively dry, whereas saturation ratio becomes a dominant factor while the soil is in wetter condition; (2) when the saturation ratio becomes dominant, the soil material could rarely reach a CBR of 5% or above, which was often regarded as competent materials by many design standards; (3) the moisture ratio (R m) of the saprolitic subgrade materials is one of the useful parameters in estimating M r and (4) the distinctive behaviours of saprolitic subgrade soils under CBR, unconfined compressive strength and repeated load tests are considered to be related to the degree of freedom of volume change for soil samples during the tests.
ISSN: 1029-8436
DOI: 10.1080/10298436.2012.727993
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