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Minimum Reinforcing for thick slab on ground

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I am designing a concrete mat, 3 ft. thick, which will serve as the top of slab as well.  My questions is do I need to provide the minimum top steel of 0.0018% of gross area for shrinkage control based on the overall depth?  Is there a reduction for this for extremely thick slabs?

 

 

 

Rich Lewis

Lewis Engineering