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

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

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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 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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