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

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

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

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

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