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The expansion index is also known as ___________

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The expansion index is also known as ___________

(a) compressibility index

(b) compression index

(c) swelling index

(d) consolidation index

The question was asked in an interview for internship.

The question is from Consolidation Process in section One Dimensional Consolidation of Geotechnical Engineering I

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Correct choice is (c) swelling index

For explanation: The expansion index is also known as swelling index and is represented by Cs. The expansion curve is a fairly straight line on semi log plot. The expansion index is a measure of volume increase due to the removal of pressure.

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