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
With the increase in the amount of compaction energy

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

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