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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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