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RE: Minimum Slab on Grade Steel

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Keith,
 
    I would have to agree with Stan (he's a smart guy).  I designed a restaurant slab here in the "BOOT" (Louisiana) about five (5) years ago with no rebar.  The building official questioned it, and I pointed to him that it was non structural and there were no minimums.  I further copied portions of ACI 302 for his review.  The building had about 5' of select fill under the slab and a very tight saw cut pattern in the slab to meet the architectural program.  I have yet to see a single non-sawn crack appear in the slab.
    I must say that this slab was atypical; as I typicall use #3's @ 12" or 4's @ 16".
 
 
Brian K. Smith, P.E.
-----Original Message-----
From: Caldwell, Stan [mailto:scaldwell(--nospam--at)halff.com]
Sent: Thursday, May 20, 2004 5:10 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Minimum Slab on Grade Steel

Keith:
 
I don't believe that there is an accepted minimum reinforcing ratio for slabs on grade.  I have occasionally designed industrial slabs with no (zero, nil, nada) reinforcement and had good success.  Of course, this requires frequent jointing and excellent curing.  
 
Stan R. Caldwell, P.E.
Dallas, Texas
 
-----Original Message-----
From: Keith De Lapp [mailto:keith(--nospam--at)kdlengineering.com]
Sent: Thursday, May 20, 2004 4:33 PM
To: seaint(--nospam--at)seaint.org
Subject: Minimum Slab on Grade Steel

It has always been my opinion that ACI 7.12.2.1 (0.0018 minimum temperature and shrinkage reinforcing) applies to elevated slabs and not slabs on grade.  I have always designed my sog reinforcing to ACI 7.12.2.1.
 
Is there a code or industry recommendation for sog minimum steel?  I find myself in a situation where a contractor has made an error and I am trying to substantiate my design/specification with code/industry reference while the contractor tries to politely challenge me.
 
Thanks in advance for your prompt response.
 
Keith De Lapp, P.E.
KDL ENGINEERING