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Used coffee grounds were charred at 350 degrees Celsius until they became a charcoal-like biochar. That material replaced 15 percent of the sand by volume in a concrete mix (scienceblog.com)
submitted 2 months ago by to c/environment@sh.itjust.works
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[–] 1 point 2 months ago (1 child)

but coffee isnt actually a good source, as growing it seems very problematic to begin with.

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