For the same soil, increasing the compactive effort generally causes the maximum dry unit weight to:
Correct answer: B. Rise while optimum moisture falls
- A. Decrease while optimum moisture rises
- B. Rise while optimum moisture falls
- C. Remain constant while saturation falls
- D. Rise while optimum moisture also rises
Explanation
Greater compactive effort usually produces a higher maximum dry unit weight and a lower optimum moisture content. The increased effort removes air more effectively, while less added water is needed to achieve the denser condition.
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About Soil Mechanics and Foundations
Soil mechanics examines index properties, phase relationships, classification, permeability, seepage, compaction, consolidation, shear strength and earth pressure. Foundations apply these principles to bearing capacity, settlement and shallow or deep foundation selection, with clear distinction between compaction, which expels air, and consolidation, which expels water over time.
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