Soil Mechanics and Foundation
With the increase in the amount of compaction energy

both optimum water content and maximum dry density decrease[ES 93]
optimum water content increases but maximum dry density decreases
both optimum water content and maximum dry density increase
optimum water content decreases but maximum dry density increases

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Soil Mechanics and Foundation
The admixture of coarser particles like sand or silt to clay causes

increase in both liquid limit and plasticity index
decrease in both liquid limit and plasticity index
decrease in liquid limit and increase in plasticity index
decrease in liquid limit and no change in plasticity index

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Soil Mechanics and Foundation
Within the consolidation process of a saturated clay

both neutral pressure and effective pressure increase
a gradual decrease in neutral pressure and a gradual increase in effective pressure takes place and sum of the two is constant
a gradual increase in neutral pressure and a gradual decrease in effective pressure takes place and sum of the two is constant
both neutral pressure and effective pressure decrease

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