A 4" slab of standard 3,000 psi concrete thickened at load-bearing walls (or with concrete piers for columns / posts) should be sufficient. Of course, a thicker slab may be needed where a heavy piece of equipment or heavy stored items are located. Be sure the soil where you plan to pour the slab is properly compacted before pouring concrete.
Is a building permit required in your area? If so, you will need to specify things like concrete slab thickness and minimum strength before getting a permit.
We did a 6" with a lot of rebar in case we wanted to use the skid steer inside, which we have had to do. We had to pull our honey sump out of the floor to replace the heating element. It was nice not to worry about the floor.
i poured mine 6", 5 1/2 sack mix. i put in 3 zones of radiant heat, sloped the floor to my drains, and hired people better than me to finish it. Just got the outdoor wood boiler hooked up to the floor last week. happy with everything so far.
Psi is not as critical, 3000 should be fine unless you are point loading something heavy on a very small footprint. Proper compacted base, so the slab is evenly supported, rebar and wire to spread the load, and proper thickness especially if using the edges as footings are the most important. Good finishing to consolidate the surface is also important, and don't rush to use it until it can cure. 75% strength in 7 days, most at 28 days, unless you pay more for high early strength mix.
This post reminds me of what my old boss used to say many years ago when I worked construction.."ya know there are two kinds of concrete...concrete that's cracked, and concrete that's gonna crack".. get a compaction test as the soil prep is very important. Even on all sand like in Florida..
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