The Roman Concrete That Outlasted Every Skyscraper We've Ever Built

Added: 2026-05-20

[00:00:00]Name one building material stronger at 2,000 years old than the day it was made. I'll wait.

[00:00:06]Modern concrete starts cracking within decades. Bridges, highways, parking garages, all degrading right now.

[00:00:14]>> [music] >> So, what did the Romans figure out that we somehow forgot? They mixed volcanic ash called pozzolana with seawater and lime. Most engineers thought seawater would destroy it, but it does the opposite. When seawater hits that [music] volcanic ash, it creates a rare mineral called tobermorite, and it actually grows stronger over time as it fills its own cracks.

[00:00:37]Roman harbor walls built in 37 BC are still intact underwater [music] today.

[00:00:42]We've known about this since 2017. We still don't use it at scale. Drop a comment if you got it right, and follow because we cover the breakthroughs that textbooks [music] leave out.