USCS Class of a Fine-Grained Soil
MediumUSCSsoil classification
A soil has 65% passing the No. 200 sieve, LL = 45 and PL = 25. The soil is inorganic. Its USCS classification is most nearly:
- AML
- BCH
- CMH
- DCL
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Answer: D. CL
More than 50% passes the No. 200 sieve, so the soil is fine-grained. LL = 45 < 50 gives a low-plasticity symbol. PI = 45 − 25 = 20, and the A-line is 0.73(45 − 20) = 18.3. The PI plots above the A-line, so the soil is CL. ML would require PI below the A-line.
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