And the real deal is modern https://en.m.wikipedia.org/wiki/Textile-reinforced_concrete https://en.m.wikipedia.org/wiki/Textile-reinforced_concrete. Especially

And the real deal is modern https://en.m.wikipedia.org/wiki/Textile-reinforced_concrete https://en.m.wikipedia.org/wiki/Textile-reinforced_concrete. Especially the combination of carbon fiber and concrete is a very promising solution, which is researched in Germany: https://de.m.wikipedia.org/wiki/Carbonbeton https://de.m.wikipedia.org/wiki/Carbonbeton This stuff is superior to anything the romans did in every aspect.