Soil Mechanics and Foundation
Highway Research Board (HRB) classification of soils is based on

plasticity characteristics
particle size composition
both particle size composition and plasticity characteristics
None of these

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

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