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The compressibility of clays may also be caused by the following factor.

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The compressibility of clays may also be caused by the following factor.

(a) changes in salinity

(b) ion exchange

(c) expulsion of double layer water from between the grains

(d) swelling of clay

I got this question in an interview for internship.

Origin of the question is Consolidation Process topic in section One Dimensional Consolidation of Geotechnical Engineering I

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Correct choice is (c) expulsion of double layer water from between the grains

Explanation: The compressibility of clays may also be caused by the three factors:

I. expulsion of double layer water from between the grains

II. slipping of particles to new positions of greater density

III. bending of particles as elastic sheets

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