Unconfined compressive strength of rocks is known to vary with changes in moisture content. However, previous studies report inconsistent results about this subject. The purpose of this study was to investigate the relationship between unconfined compressive strength and varying degrees of saturation for sandstone rocks and explain it in terms of index engineering properties and petrographic characteristics. Eighteen NX-size (2.125 inches or 5.4 cm in diameter) cores were prepared from each of the nine sandstones sampled from central Ohio through central Pennsylvania. Laboratory tests were conducted to determine absorption, dry density, specific gravity, and porosity values for each core. Cores were then tested for unconfined compressive strength at 0
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Shakoor et al. (2009) studied this question.
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