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Identify the given joint in Concrete Structures. (a)Partial contraction joint

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Identify the given joint in Concrete Structures.

(a) Partial contraction joint

(b) Complete Contraction Joint

(c) Horizontal construction joint

(d) Dummy joint

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The above asked question is from Joints in Concrete Structures in portion Cement Concrete Construction of Construction & Building Materials

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Correct option is (d) Dummy joint

The best explanation: Above figure shows another form of contraction joint. It is also known as a dummy joint and in this case, a groove of 3 mm width is created in the concrete member to act as a joint. The groove is filled with the joint filler and its depth is about 1/3 to 1/5 of the total thickness of the member.

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