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

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Soil Mechanics and Foundation
Effective stress on soil

Increases voids ratio and decreases permeability
Increases both voids ratio and permeability
Decreases voids ratio and increases permeability
Decreases both voids ratio and permeability

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