SSC JE Civil Engineering 23-Mar-2021 Shift 1 Paper

Question : 103 of 200

Marks: +1, -0

The determination of plasticity index and the percentage by weight of clay mineral finer than 2 μ present in the soil were done for two soil samples A and B. The ratio of plasticity index to the percentage of clay size particle for the samples A and Bare given in the table.

Soil Sample	Ratio of plasticity index to percentage of clay size particle
Sample A	Less than 0.75
Sample B	Greater than 1.25

Sample A: Normal; Sample B: Inactive
Sample A: Active; Sample B: Normal
Sample A: Active; Sample B: Inactive
Sample A: Inactive; Sample B: Active

Validate

Solution:

Explanation:
The Activity of the soil (A)
The activity of the soil is given by the ratio of the plasticity index ( $\I\p$ ) and the percentage of clay fraction (C) in the soil.
It indicates water absorption capacity or indicates swelling and shrinkage characteristics.
Activity

={{ \Plasticity \Index }}/{{ \Per \cent \of \clay \particles \finer \than } 2μ {\m}}

Activity-based classification of clays:

Activity	Classification
< 0.75	Inactive
0.75 - 1.25	Normal
> 1.25	Active

Hence, Sample A is inactive and Sample B is active.

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