Question

Consider the following statements:
1. Illite the mineral largely responsible for the swelling and shrinkage behaviour of clayey soils.
2. A differential free swell value 55% indicates a soil with low degree of expansiveness.
3. Higher the plasticity index of a soil, greater its swelling potential.
4. A low shrinkage limit of a soil indicates possibility of swelling at low water content.

Which of the above statements are correct?

• A. 1 and 2
• B. 2 and 3
• C. 1 and 4
• D. 3 and 4

Answer 1

The correct option is D 3 and 4

(d)
$\bullet$ Montmorillonite is the mineral largely responsible for swelling and shrinkage. Activity of montmorillonite is 1 to 7 and activity of lllite is 0.5-1
$\bullet$ Differential free swell value more then 50 indicates highly expansiveness.