this post was submitted on 10 Jun 2026
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[–] teyrnon@sh.itjust.works 4 points 3 weeks ago (1 children)

Concrete doesn't last, stone does. Brick to a lesser extent.

[–] currycourier@lemmy.world 7 points 3 weeks ago (1 children)

*Concrete with rebar. Roman concrete has lasted plenty long. Though the lime in it helps.

[–] teyrnon@sh.itjust.works 2 points 3 weeks ago

That is true. Roman Concrete is still standing 2k years on. Ours lasts decades, maybe a century if well done.

They used ash from Mount Aetna in Sicily to make some of it. I forget the thing with the lime, how that was different than what we use?