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The study discusses using coffee to replace some of the sand. It would lower the amount of sand needed and that would be significant.
https://www.engr.psu.edu/ce/courses/ce584/concrete/library/materials/History/DevelopementofPC-main.html
That's dumb and it is patently incorrect.
The study discusses using coffee to replace some of the sand. It would lower the amount of sand needed and that would be significant.