Comment on In a First, America Dropped 30,000-Pound Bunker-Busters—But Iran’s Concrete May Be Unbreakable, Scientists Say

• unexposedhazard@discuss.tchncs.de ⁨9⁩ ⁨hours⁩ ago

  The greater strength is achieved by turning concrete into a composite material with the addition of steel or other fibers.

  Fiber reinforcment is thousands of years old.

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  • deranger@sh.itjust.works ⁨9⁩ ⁨hours⁩ ago

    Calling that pyramid age I think is a little disingenuous, they didn’t have 40,000 psi concrete back in those days.

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    • unexposedhazard@discuss.tchncs.de ⁨59⁩ ⁨minutes⁩ ago

      Thats fair yeah

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• Fondots@lemmy.world ⁨9⁩ ⁨hours⁩ ago

  So I did not read the article because of a paywall I’m too lazy to circumvent right now

  But from OP’s summary, the main technology they’re talking about concrete reinforced with steel or other fibers.

  And that’s definitely more advanced than “pyramid age”

  But it’s also pretty much a direct descendant of mud brick reinforced with straw which humanity has been using since well before the pyramids. Same basic concept, different materials.

  So yes and no.

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  • Lost_My_Mind@lemmy.world ⁨9⁩ ⁨hours⁩ ago

    Yes…no…maybe? I don’t know. Can you repeat the question?

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• Bonus@slrpnk.net ⁨8⁩ ⁨hours⁩ ago

  Egyptians stacked blocks of stone to build the pyramids.

  Roman concrete was impressively strong.

  Neither of them had steel-reinforced concrete.

  Neither did Gothic cathedrals, which is why they needed flying buttresses.

  Reinforced concrete as we know it today is a 19th century innovation, as I understand it.

  en.wikipedia.org/wiki/Reinforced_concrete?wprov=s…

  Maybe the commenter was thinking of adobe.

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  • shalafi@lemmy.world ⁨5⁩ ⁨hours⁩ ago

    And this tech goes way beyond merely “reinforced”.

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