Soil Mechanics and Foundation
For better strength and stability, the fine grained soils and coarse grained soils are compacted respectively as

wet of OMC and wet of OMC
wet of OMC and dry of OMC
dry of OMC and wet of OMC
dry of OMC and dry of OMC where OMC is optimum moisture content

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

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

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