The plasticity index of a soil is
Choose the correct answer
liquid limit minus plastic limit
plastic limit minus shrinkage limit only
liquid limit plus water content
void ratio divided by porosity
Correct Answer
A. liquid limit minus plastic limit
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Plasticity Index PI = Liquid Limit (LL) − Plastic Limit (PL). PI measures the range of water content over which a soil behaves plastically. PI > 17 → highly plastic clay; PI 7–17 → medium plasticity; PI < 7 → low plasticity silt/sand. PI is used in Casagrande's plasticity chart to classify fine-grained soils.
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