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Re: Effect of Two Grade of Concrete on Flexural Reinforcement

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        I've never done this or seen it done.
        That said I expect you could make it work.  After all, they repair bridge decks subjected to salt damage by removing the top concrete and top layer of reinforcing and replace these with new steel and new concrete bonded to the old.
        I expect one problem area would be a potential plain of failure (in shear) along the joint.  My personal inclination would be to over design the shear reinforcement; but, as I said above, I don't have any experience to know whether this is necessary or not.
H. Daryl Richardson
----- Original Message -----
Sent: Tuesday, May 23, 2006 1:09 AM
Subject: Effect of Two Grade of Concrete on Flexural Reinforcement

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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