The liquid limit and plastic limit of clay materials is 45% and 25% respectively, what is the activity of clay materials if 20% by weight of particles of size less than 2 microns?

Question

RRB Paper · Accepted Answer

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

Given

Liquid Limit = 45%
Plastic limit = 25%

Clay fraction = 20% = 0.2

Calculation:

Given,

LL = 45 %

PL = 25 %

PI = 45 − 25 = 20% = 0.20

Activity = PI/ clay fraction %

Activity = 0.2/0.2 = 1

The liquid limit and plastic limit of clay materials is 45% and 25% respectively, what is the activity of clay materials if 20% by weight of particles of size less than 2 microns?

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The correct answer is `No. 4: 1`

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The liquid limit and plastic limit of clay materials is 45% and 25% respectively, what is the activity of clay materials if 20% by weight of particles of size less than 2 microns?

0

3

2

1

The correct answer is No. 4: 1

The correct answer is `No. 4: 1`