Correct Answer - Option 3 : Active
Explanation
The Activity of the soil (A)
The activity of the soil is given by the ratio of the plasticity index (Ip) and the percentage of clay fraction (C) in the soil.
It indicates water absorption capacity or indicates swelling and shrinkage characteristics
\({\bf{A}} = \frac{{{{\bf{I}}_{\bf{P}}}}}{{\bf{C}}}\)
Where,
C = percentage of clay particles less than a 2-micron size
IP = plasticity index = WL - WP
WL = liquid limit of the soil, WP = plastic limit of the soil
Here, Activity is given as 2 i.e. > 1.25. The soil is active.
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Activity number
|
Type of soil
|
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A < 0.75
|
Inactive
|
|
A = 0.75 to 1.25
|
Normal
|
|
A > 1.25
|
Active
|
