That's an estimate of the weight of my concrete slab. And that's not counting a few tons of base material underneath. It used 7.5 cubic yards of concrete, minus a little waste, plus a considerable amount of heavy gauge rebar, 4 #6 bars in each beam, and a matrix of #3 on top.
Each cuyd of concrete weighs 3915 pounds, about 2 tons. With a few hundred pounds of rebar, that brings the total to nearly 15 tons.
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