An inorganic fine-grained soil has a liquid limit of 45 percent and a plasticity index of 20 percent. Under the Unified Soil Classification System, its likely symbol is:
Correct answer: C. CL
- A. CH
- B. ML
- C. CL
- D. MH
Explanation
The liquid limit is below 50 percent, so the soil has low plasticity. Its plasticity index lies above the A-line, indicating clay rather than silt, giving the symbol CL.
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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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