The plasticity index of a soil is equal to:
Correct answer: C. Liquid limit minus plastic limit
- A. Liquid limit plus plastic limit
- B. Plastic limit minus shrinkage limit
- C. Liquid limit minus plastic limit
- D. Liquid limit minus shrinkage limit
Explanation
Plasticity index is PI = LL minus PL, and it represents the range of water content over which the soil remains plastic. Shrinkage limit is not used in this calculation.
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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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