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Effect of Two Grade of Concrete on Flexural Reinforcement

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Hi all!
Has anyone of you accepted heterogeneous beam construction using two grades of concrete?  Part of the beam (about 2/3 of its height) is poured with C60 and the rest of the beam (about 1/3 of its height) is poured with the slab using C45.  This construction method is suggested to speed up construction of a 50-storey building.  The beams were designed using C60.

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