The concept that Roman Concrete was somehow better is a strange idea.
First: 99% of Roman concrete has long since turned to dust. Through no intent of it's creators, that stuff did not last.
But the 1% that did last has two important qualities: it's incredibly thick, overbuilt; and through some fluke of chemistry, they unintentionally built it with some input chemicals that actually helped it be stronger.
But it wasn't intentional and it isn't some kind of magic.
First: 99% of Roman concrete has long since turned to dust. Through no intent of it's creators, that stuff did not last.
But the 1% that did last has two important qualities: it's incredibly thick, overbuilt; and through some fluke of chemistry, they unintentionally built it with some input chemicals that actually helped it be stronger.
But it wasn't intentional and it isn't some kind of magic.