Just a little tidbit history of concrete.
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Cool site, Christopher. 
From site:
Young cement built using a Roman recipe would probably not have the compressive strength to handle modern use — at least not initially.
But that doesn’t mean concocting a concrete mix using Roman engineering savvy wouldn’t be useful. The concrete could potentially be used to replace other corrodible building materials — like steel and modern concrete — in newly constructed tidal lagoons, for instance, and other sea or sea-adjacent structures.
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I noted that. Hopefully some day they will be able to mix the Old recipe with Modern technology to create a strong and more durable type of concrete.
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