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 - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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