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Reinforcing Steel Mechanical Splices

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What is the standard practice for concrete cover over reinforcing steel
mechanical splices?  Since the mechanical splices have a larger diameter
than the reinforcing steel, the cover over the splice is less than the cover
over the rebar.

If the cover is specified as 3", should the nominal cover be increased to
perhaps 3.5" to maintain the 3" cover over the mechanical splice?  Or is the
reduced cover at the splice considered acceptable?

David Finley, P.E.