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

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

Right Answer is:

Highly plastic

SOLUTION

The plastic index is defined as the difference between the liquid limit and the plastic limit.

I= wL – wP

Where,

wL = Liquid Limit

wP = Plastic limit

IP

Plasticity

0

Non-Plastic

1 to 5

Slight Plastic

5 to 10

Low Plastic

10 to 20

Medium Plastic

20 to 40

Highly Plastic

>40

Very High Plastic

Given plastic limit 21%, therefore, soil sample is Highly plastic

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