While the density of crushed limestone will vary, 2,700#/yard can be used to estimate. That's about 20 cubic feet per ton, or 40 square feet per ton at 6" thick.
Good bedding for a slab will vary based on actual soil conditions under your slab. Talk to a local contractor at least to get some advice. If you really want it right, you need to get soil borings and have a soil engineer recommend a foundation. That's what industrial firms do, and they don't do it just to spend money. The engineer will also recommend rebar spacing, which will be less than you expect. I had an engineer design a slab for a shop with a 6" floor. He specified #3 four ft on center. We just couldn't go that light.
I always float a slab on sand with a vapor barrier on top of the sand. Sand self compacts when you wet it down, rock needs to be rolled to compact or you may see future settling. Sand is also generally cheaper but it needs to be clean fill sand as clay in it will cause swelling and shrinking.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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