How ancient Romans made stronger concrete than today

YouTube description:

Many structures built by ancient Romans around 2,000 years ago are still standing, and some are still in excellent condition. Over the last decade, researchers have come discover the Romans' secret concrete recipe that has maintained so many of its now-ancient buildings.
oritteroposays...

They actually mention that it could be used as-is where we would need to use steel reinforced concrete.

Where it really wins out is marine applications, which get stronger from reacting with seawater rather than weakening over time.

cloudballoonsaid:

Isn't the title misleading/wrong? It should be longer-lasting, not stronger, than today's concrete

Paybacksays...

Imagine waiting 6 months for a single highrise floor pour to set.

That's why modern concrete isn't as strong. It has to set a Hell of a lot quicker to be cost effective.

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