A soil sample is tested for its plasticity index and the obtained value of plasticity index is 21. In such case, the soil sample can be described as:

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  1. non plastic
  2. low plastic
  3. highly plastic
  4. medium plastic

Answer (Detailed Solution Below)

Option 3 : highly plastic
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Explanation:

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Liquid limit (WL): The water content at which soil changes its consistency from plastic to a liquid state.

Plastic limit (WP): The water content at which soil changes its consistency from brittle/crumbly to a plastic state.

Shrinkage limit (WS): A state when the decrease in moisture content leads to solid-state, no change in volume of soil mass is observed, the consistency of soil changes from semi to solid-state. The boundary water content is called shrinkage limit.

Plasticity index (IP) = WL - WP

Where, WL = Liquid limit, WP = Plastic limit, WN = Natural water content

Based on the plasticity index, the soil may be classified as followed:

Plasticity Index

Soil Description

Soil Type

0

Non-plastic

Sand

1 – 7

Low plastic

Silt

7 - 17

Medium plastic

Silty clay

> 17

Highly plastic

Clay
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