Question

A fine grained soil has 60% (by weight) silt content. The soil behaves as semi-solid when water content is between 15% and 28%. The soil behaves fluid-like when the water content is more than 40% .The 'Activity' of the soil is

• A. 3.33
• B. 0.42
• C. 0.30
• D. 0.20

Answer 1

The correct option is C 0.30

$Activity=\frac{l_p}{percentageclayfraction}$

$=\frac{40-28}{40}=0.3$