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What are the minerals, responsible for large volume decrease in soil on drying in clayey soils?

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+1 vote
in Geotechnical Engineering I by (102k points)
What are the minerals, responsible for large volume decrease in soil on drying in clayey soils?

(a) Ilite and Kaolinite

(b) Montmorillonite

(c) None of the mentioned

(d) All of the mentioned

This question was posed to me in exam.

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

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Best answer
Correct choice is (a) Ilite and Kaolinite

For explanation I would say: When illite and kaolinite minerals are present in clay soil, the soil exhibit large initial volume decrease on drying.

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