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this post was submitted on 04 Oct 2023
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I thought they figured this out already, and it was a combination of the lime chunks allowing the concrete to heal, and also mixing it hot somehow made a difference.
I've heard lots of reasons. One was that the Romans used volcanic ash, which has some kind of special structure that maked it durable. I've also heard that it had to do with using salt water. Obviously not using rebar is important to longevity. The article talks about the lime chunks in the Roman section. I'm kind of a sucker for any article about Roman history though.
Well then, eat your heart out!
I read a good chunk of that and I'm not going to lie the chemistry part went right over my head. My new favorite phrase is "post-pozzolanic reactivity."