Abstract
In this paper, a staged compression-immersion-direct shear test was conducted on compacted samples of crushed mudstone aggregates and its compressive and shear behavior are discussed with a focus on cementation effects. Compression behavior of the compacted samples was influenced significantly by the compaction degree as expected, as were shear behavior and shear strength. Immersion caused an additional compression and a reduction in mobilized shear stress and in the dilatant nature during shear at low applied pressure levels. Moreover, immersion significantly reduced the peak shear strength parameter c with only a little change in phi. The compression and critical state lines of the nonimmersed and immersed specimens seem to parallel each other, and the compression line of the nonimmersed and the critical state line of the immersed form the upper and lower bounds, respectively. A gap between shear stress-void ratio lines of the specimens with and without immersion is considered to represent a combined effect of cementation retained in a crushed mudstone aggregate itself and an interlocking effect of aggregates.
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