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Engineers Just Made Concrete 30% Stronger. The Secret Ingredient? Coffee.
(www.popularmechanics.com)
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this post was submitted on 25 Aug 2023
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That's just because right now used coffee is trash and sand isn't. If you remember back when bio diesel started getting popular, all of a sudden people were stealing fryer oil from restaurants. If you see a smelly looking black dumpster behind a restaurant, that is the used fry oil.