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Philip Brune, a research scientist at DuPont Pioneer who has studied the engineering properties of Roman monuments. “It's the most durable building material in human history, and I say that as an engineer not prone to hyperbole.” By contrast, modern concrete exposed to saltwater corrodes within decades.
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Roman concrete used 10 percent less binder that was produced at a temperature 1/3 lower than that needed for processing Portland cement, according to the researchers.