According to IS classification (IS 1498), a soil with liquid limit 45% and plasticity index 20% is classified as:
Choose the correct answer
ML (Silt of low compressibility)
MI (Silt of intermediate compressibility)
CI (Clay of intermediate compressibility)
CH (Clay of high compressibility)
Correct Answer
C. CI (Clay of intermediate compressibility)
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For LL=45% (between 35-50% = I range) and PI=20%, the soil plots above the A-line on the plasticity chart (A-line: PI = 0.73(LL-20)). At LL=45%, A-line PI = 0.73×25=18.25. PI=20 > 18.25, so it plots above A-line → Clay. LL in I range → CI.
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