Why was Roman concrete so incredibly superior?

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The Romans are often unfairly accused of just copying others' inventions, but nothing could be further from the truth, as the impressive invention of Roman concrete demonstrates. Now why was this concrete so superior? Well, because of its extreme durability. The largest concrete dome on the planet is still the one of the Pantheon, built around 1900 years ago, having survived countless earthquakes. In fact roman concrete is much more durable than modern concrete, and can withstand water erosion much better. We can still find impressive remnants of roman underwater concrete construction in Caesarea Maritima, or in Baia, where it has withstood water erosion for 2000 years. Compare that to modern concrete, that can't even withstand seawater for 50 years. That's why more and more concrete companies are trying to imitate roman concrete. The reason why roman concrete is so superior, is that the Romans used an additional ingredient, namely pozzolanic ash, a volcanic ash, which prevents cracks from spreading in the concrete, thus rendering it very resilient to erosion of any kind.