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tequila_slurry t1_ixf8pi8 wrote

Ocean sand naturally has microscopic small particles of shells/coral etc. which actually make up a great deal of it. These are an absolutely necessary component of concrete. That's why glass bottles ground into sand, granite sand, and desert sand are completely unsuitable in making concrete. I believe it's more about chemical makeup than grit size (which would be completely controllable when grinding glass and stone into sand).

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