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Why Roman concrete is still stronger than RAAC (and other modern concretes)
(www.chemistryworld.com)
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The article suggests that the roman concrete gets it's properties due to using a certain kind of volcanic ash found around Naples, but not common everywhere else, so using their recipe wouldn't be sustainable with the amount of concrete we use these days.
On the other hand, these days it wouldn't be about that specific ash. You could take a look at it, say "oh, yeah, that's just florgium whateverthefuxide" and then there'd probably be readily available sources of it.
Got it.