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A clay which contains Kaolinite has an activity value of: _____.
1. 1
2. 0
3. 0.4
4. 0.8

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Correct Answer - Option 3 : 0.4

Explanation:

  • The behavior or plasticity of soil depends on the type of mineral (Kaolinite, Illite, Montmorillonite), amount of mineral, and amount of adsorbed water present in the soil.
  • Skempton defined a parameter termed as an activity that represents the compressibility or volume change in soil with a change in water content.
  • Activity defined as the ratio of plasticity index of soil to the percentage of particles in it having a size less than 2μ (clay size).

The activity of clay,

 \({A_t} = \frac{{{I_p}}}{{\% C}}\)

Where,

Ip = plasticity index

%C = % of clay size particle 

Mineral

Activity

Na – Montmorillonite

4 - 7

Ca – Montmorillonite

1.5

Na – iIIite

0.5 – 1.3

Na – Kaolinite

0.3 – 0.5

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