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Re: minimum fc for Residential slab on grade

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Sect. 1701.5.2 does not require inspection for f'c not greater than 2,500 psi.  So what's the problem w/ spec'ing it?  It's awfully tough anyway to get concrete as low as 2,000 psi.  Most suppliers will go higher regardless of such a low strength specified.

Ephraim G. Hirsch, SE