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Romans didn't use rebar. Everything they built was in compression which is limited by the compressability of the base rock. Pantheon with its ocular roof is prime example, used mostly continuous since built. Columns out front are made of solid marble which is probably the weakest thing of the structure.
Probably helps that Rome doesn't get much freezing
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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