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oh they might have used quicklime

>During the hot mixing process, the lime clasts develop a characteristically brittle nanoparticulate architecture, creating an easily fractured and reactive calcium source, which, as the team proposed, could provide a critical self-healing functionality. As soon as tiny cracks start to form within the concrete, they can preferentially travel through the high-surface-area lime clasts. This material can then react with water, creating a calcium-saturated solution, which can recrystallize as calcium carbonate and quickly fill the crack, or react with pozzolanic materials to further strengthen the composite material. These reactions take place spontaneously and therefore automatically heal the cracks before they spread. Previous support for this hypothesis was found through the examination of other Roman concrete samples that exhibited calcite-filled cracks.

neat :#marseyneat:

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So is this better than the shit we use?

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TLDR: It's c*m

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as someone who has watched a lot of legitimate verified documentaries on the history channel, i already know the answer.

![](https://media.giphy.com/media/3oEjI789af0AVurF60/giphy.webp)

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Happy Birthday my nig :scoot:

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Mixed and poured by :marseyalien:s.

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Why did it take these stupid science bitches so long to figure this out? The concrete was just sitting there the entire time. They didn't think to break it apart and look at it with their microscopes or some shit?

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The US landed on the moon and CERN discovered multiple subatomic particles in less time than it took these people to determine what Roman concrete was made of, holy shit historians and archaeologists are useless :marseyxd:

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that's why ATLVNTVS-posting is based

:#marseyilluminati2::!#marseycapypharaoh::marseyschizoshaking::marseyschizoshaking:

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Cured concrete is chemically different from concrete that's still wet

It's still stupid, but you can't look at it after it sets and immediately know what it was made of

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We literally don't even understand why brains work or why we need to sleep. If you have no idea what to look for then it's really hard to figure out.

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Very nice, I hope they find commercial success :marmseylegionnaire:

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The little-known secret is the roman empire was built on construction funding. But the buildings were too durable. Nobody had to buy another one after a couple hundred years. The economy collapsed because the concrete was TOO good.

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They "solve" this riddle every few months

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Nope, it's tech lost to the ages

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glad those nerds solved that mystery within my lifetime

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Neat!

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This is old news. It's been known for a while that a specific chemical nature of ash was responsible for why roman concrete was so durable

:marseycheeky:

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