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When the Liquid limit of a soil is less than the plastic limit, then the plasticity index is reported as 

When the Liquid limit of a soil is less than the plastic limit, then the plasticity index is reported as  Correct Answer Zero

Plasticity index (PI) is the range of water content over which the soil remains in the plastic state.

Mathematically defined as,

Plasticity Index = Liquid Limit – Plastic Limit.

This parameter cannot be negative if plastic limit, in some exceptions, is larger than the liquid limit, it is considered to be zero and soil is considered non-plastic.

The plasticity of a soil is its ability to undergo deformation without cracking. It is an important index property of fine-grained soil, especially for clayey soils.

Generally, sands do not possess any plasticity and their plasticity index is assumed to be zero.

Related Questions

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