Plasticity Index from Atterberg Limits
EasyAtterberg limitsplasticity index
A fine-grained soil has LL = 55 and PL = 25. Its plasticity index is:
- A20
- B25
- C30
- D80
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Answer: C. 30
PI = LL − PL = 55 − 25 = 30. Adding the limits gives 80, which is meaningless.
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