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nickff
on Aug 23, 2023
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Coffee grounds make concrete 30% stronger
I haven't seen any data, but coffee grounds seem more similar to straw, which has been used with some success.
https://iopscience.iop.org/article/10.1088/1757-899X/394/3/0...
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https://iopscience.iop.org/article/10.1088/1757-899X/394/3/0...