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Originally Posted by kalos72
Concrete/Cement/Mortar recycled? As in grind up a slab of concrete to dust add water and presto new concrete? Are we sure bout that? Cant be THAT easy...  |
IIRC you'd have to roast the concrete to get the limestone reactivated (quicklime), and that creates some very toxic fumes (old Medieval siege chemical warfare). Anyone with a better grasp of the chemistry, please chime in.
And just what is the hardness of rebar? Could it be forged into useful tools without resmelting? I envision rebar drills (as in "John Henry" sledgehammer-type chisel drills) that could be used to perforate concrete slabs so that they could be more easily split. Drill a hole/holes, wash out the rock dust, insert explosives, tamp, detonate. Shazam--split rock/concrete.
Sheetrock/wallboard is gypsum, right? Would this be a viable additive to supplement garden soil? Or are there reasons that it would be contraindicated?