Thanks to everyone who's replied. Let me offer more information. The slab will be inside a church, exposed (no flooring), jointed and saw-cut in a decorative pattern, stained and sealed. It will be constructed on a site in Orange, CA (i.e. doesn't freeze), on soils that the geotech says are...
I'm designing an exposed slab for a church and I'd like to minimize cracks as much as possible. I'm using expansion joints and saw-cut joints throughout the slab in a decorative pattern. The soils engineer recommends the slab be 4" thick with #3 bars 12" oc ew over 4" crushed...
