this post was submitted on 25 Jun 2025
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In a First, America Dropped 30,000-Pound Bunker-Busters—But Iran’s Concrete May Be Unbreakable, Scientists Say (www.popularmechanics.com)
submitted 1 day ago by NoSpotOfGround@lemmy.world to c/technology@lemmy.world
99 comments fedilink hide all child comments
 

Previously, a yield strength of 5,000 pounds per square inch (psi) was enough for concrete to be rated as “high strength,” with the best going up to 10,000 psi. The new UHPC can withstand 40,000 psi or more.

The greater strength is achieved by turning concrete into a composite material with the addition of steel or other fibers. These fibers hold the concrete together and prevent cracks from spreading throughout it, negating the brittleness. “Instead of getting a few large cracks in a concrete panel, you get lots of smaller cracks,” says Barnett. “The fibers give it more fracture energy.”

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[–] Zorque@lemmy.world 12 points 1 day ago (2 children)

I mean they usually only do about 30 damage anyways.

Source

[–] dalekcaan@lemm.ee 3 points 22 hours ago (1 children)

I love how unhinged random fan wikis sound without context. Here for instance: Bunker Buster, see also: Concrete Donkey and Buffalo of Lies

[–] JustinTheGM@ttrpg.network 2 points 19 hours ago

I hadn't clicked the link yet, but Concrete Donkey told me what it was immediately

[–] Buffalox@lemmy.world 3 points 15 hours ago

So Iran knew EXACTLY how strong they needed to make their defenses!
Pretty stupid of the American military to give that info to a game developer, that would obviously use it.