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RE: Minimum Reinforcing for thick slab on ground

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I think it is a good idea to provide shrinkage reinforcement - but I typically limit the required reinforcement per the following: "Concrete sections that are at least 24 in. may have the minimum shrinkage and temperature reinforcement based on a 12 in. concrete layer at each face." Ref ACI 350-01, Section (ACI 350 has higher minimum percentages than ACI 318, but the concept seems that it would be the same.)
William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)

From: Rich Lewis [mailto:sea(--nospam--at)]
Sent: Thursday, December 23, 2004 8:21 AM
To: seaint(--nospam--at)
Subject: Minimum Reinforcing for thick slab on ground

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