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 ⁨2⁩ ⁨months⁩ ago

• shalafi@lemmy.world ⁨2⁩ ⁨months⁩ ago

  Hardly. Did you read the article?

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  • unexposedhazard@discuss.tchncs.de ⁨2⁩ ⁨months⁩ 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 ⁨2⁩ ⁨months⁩ 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 ⁨2⁩ ⁨months⁩ ago

        Thats fair yeah

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  • Fondots@lemmy.world ⁨2⁩ ⁨months⁩ 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 ⁨2⁩ ⁨months⁩ ago

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

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  • Bonus@slrpnk.net ⁨2⁩ ⁨months⁩ 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 ⁨2⁩ ⁨months⁩ ago

      And this tech goes way beyond merely “reinforced”.

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• Saleh@feddit.org ⁨2⁩ ⁨months⁩ ago

  Arguably letting a big weight fall down after being brought into the air somehow is also pyramid age tech.

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  • 3abas@lemm.ee ⁨2⁩ ⁨months⁩ ago

    These bombs are not just dead weights. These bunker busters are equipped with precision guidance and fly to and hit a person on the head if they desired. It’s also designed to deliver a huge explosion AFTER it penetrates with the kinetic impact.

    It can also be set to explode right before impact, like Israel really likes to do when attaching residential high-rises, to deliver maximum destruction and death.

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