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In __________ type of cofferdam consists of a mixture of sand and clay which is filled in a bag and placed instead of earth or rock to form a cofferdam.

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In __________ type of cofferdam consists of a mixture of sand and clay which is filled in a bag and placed instead of earth or rock to form a cofferdam.

(a) Cellular cofferdam

(b) Earth dikes

(c) Rock dikes

(d) Sand-bag dikes

I have been asked this question in an online quiz.

My question is taken from Cofferdam and Caisson in portion Deep Excavations, Pile Foundations and Caisson of Construction & Building Materials

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Right choice is (d) Sand-bag dikes

Explanation: The sand-bag dykes or Sand-bag cofferdams are useful for small depth of water. The individual bags are laid in courses as in case of masonry work and the joints are filled with puddle.

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