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Why Roman concrete is still stronger than RAAC (and other modern concretes) (www.chemistryworld.com)

submitted 1 year ago by Bobo@lemm.ee to c/science

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The concrete dome of the Pantheon in Rome remains stable enough for visitors to walk beneath, and some Roman harbours have underwater concrete elements that have not been repaired for two millennia – even though they are in regions often shaken by earthquakes.

Whence this remarkable resilience of Roman concrete architecture? It’s all down to the chemistry.

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[–] zzzzz 15 points 1 year ago (19 children)

Is it that we don't know how to make concrete of equal/greater resilience? Or that modern concrete optimizes for something else (I'm guessing cost)? I didn't RTFA.

[–] CarbonIceDragon@pawb.social 9 points 1 year ago (2 children)

The article suggests that the roman concrete gets it's properties due to using a certain kind of volcanic ash found around Naples, but not common everywhere else, so using their recipe wouldn't be sustainable with the amount of concrete we use these days.

[–] zzzzz 1 points 1 year ago

Got it.

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