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Just ran into this same situation but took a little different approach.  We have a 14" SOG and reinforced it to eliminate the contraction joints and placed construction joints with dowels at the concrete pour limits.  We have significant forklift traffic and wanted to minimize joints.  We also didn't know if the contractor can cut the contraction joints to a 1/3 or 1/4 depth.
Phoenix, AZ

On 3/8/07, Rich Lewis <seaint04(--nospam--at)> wrote:

I have a 12" thick slab on ground.  I'm wondering how deep the saw cut joints should be.  ACI 302.1R-04 "Guide to Concrete Floor & Slab Construction" does not have a recommended saw cut depth.  I have a 1989 version of the same standard where the recommended cut depth is 1/4 the slab thickness.  In this case the cut is 3" deep.  The joint then needs to be filled with a semi-rigid joint filler.  The tables I see for joint filler only go up to a joint depth of 1.75 inches.   Is anyone aware of other recommendations for shrinkage control joint depth for thick slab?   

Thanks for your help.