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Scientists strengthen concrete by 30 percent with used coffee grounds::Researchers in Australia have found a new use for old coffee grounds: concrete doping!.
Well, not really. They only mentioned compressive strength, so other important qualities and measures could be worse in unacceptable ways.
Or maybe it’s great. https://www.concretecentre.com/Specification/Innovative-concrete/Charcoal-Concrete.aspx