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Identify the given type of joint in Concrete Structures.

(a) L beam construction joint

(b) T beam construction joint

(c) Expansion joint

(d) Contraction Joint

I had been asked this question during a job interview.

This intriguing question comes from Joints in Concrete Structures topic in portion Cement Concrete Construction of Construction & Building Materials

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The correct choice is (b) T beam construction joint

Easiest explanation: In case of T-beams, the ribs should be filled with concrete first and in the slabs forming the flanges can be filled up to the centre of the ribs. If a construction joint between slab and beam becomes unavoidable especially as in the case of long and deep beams, that T beams are used.

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