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I finally got why the Roman concrete at that Naples dig held up so well after watching a mason fix my mom's 90 year old brick steps
He packed in volcanic ash and lime the same way they did 2,000 years ago, and it hit me that we call it a lost art when it is really just a recipe nobody bothered to write down, so does anyone here know if the ash source or the seawater is the bigger factor in why theirs never cracks?
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hugo_nelson19d ago
Oh wow, I read somewhere the seawater was the real trick.
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