Subject: Roman Concrete...
And why was it so durable?

Snippet:
An unexpected ancient manufacturing strategy may hold the key to designing concrete that lasts for millennia.

Ancient Romans were masters of engineering, constructing vast networks of roads, aqueducts, ports, and massive buildings, whose remains have survived for two millennia. Researchers have spent decades trying to figure out the secret of this ultra durable ancient construction material, particularly in structures that endured especially harsh conditions, such as docks, sewers, and seawalls, or those constructed in seismically active locations.

https://www.sciencedaily.com/r...