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Free swell of a soil can be defined as ____________

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Free swell of a soil can be defined as ____________

(a) Swelling of soil without shrinkage

(b) Increase in volume without any constrains

(c) Limited swelling on rewetting

(d) Swelling on submergence in water

The question was asked in an online interview.

This intriguing question comes from Shrinkage and Swelling of Soil in portion Soil Water Effective and Neutral Stresses of Geotechnical Engineering I

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Correct answer is (b) Increase in volume without any constrains

Easy explanation: As per IS: 2720-part 40, free swell of a soil is defined as increase in volume of a soil without any constrains, on submergence in water.

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