A fine-grained soil has 60% (by weight) silt content. The

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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

1. 3.33
2. 0.42
3. 0.30
4. 0.20

Correct Option: C

Activity =	I_p
	C

I_p = W_L – W_p
= 40 – 28 = 12

∴ Activity =	12	= 0.3
	100 - 60