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The consolidation between Ro and Rc is called   ______________

(a) initial consolidation

(b) corrected zero reading

(c) secondary consolidation

(d) initial zero reading

I had been asked this question in an interview.

The question is from Determination of Coefficient of Consolidation in division One Dimensional Consolidation of Geotechnical Engineering I

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The correct answer is (a) initial consolidation

For explanation: The consolidation between Ro and Rc is called initial consolidation. Iinitial consolidation is when a load is applied to a partially saturated soil, a decrease in volume occurs due to expulsion and compression of air in the voids. A small decrease in volume occurs due to compression of solid particles.

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