[Tom Tetroxide]

Scientists recently found out that Roman concrete is self-healing.
https://www.scientificamerican.com/article/ancient-roman-concrete-has-self-healing-capabilities/

If we can emulate this property our concrete will not break down and have to be replaced so often.

[brownsfan]

“If we can emulate this property our concrete will not break down and have to be replaced so often.”

And that’s why it’s not used in my opinion. The same goes for asphalt. There is a way to make asphalt last longer, (I think it was a kind of infusion of rubber, not sure), but we don’t use it. I know it’s more expensive, but it would last, which probably explains why it’s not used.

[Yo-Yo]

If we can emulate this property our concrete will not break down and have to be replaced so often.

Where's the profit in that?