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
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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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[–] tyler@programming.dev 6 points 1 day ago (1 children)

I thought we do know the depth of the bunkers though. And that American bombs can’t go that deep, even multiple of them

[–] Darrell_Winfield@lemmy.world -4 points 1 day ago (3 children)

I can't speak to that aspect. But I firmly believe that if our military planned and carried out this strike, then we had very good evidence that their bunkers were at a depth these ordinance could reach.

[–] Coyote_sly@lemmy.world 19 points 22 hours ago* (last edited 22 hours ago)

Consider who actually makes this decision, in this case. It's highly likely our intelligence assessment here is very accurate orr flat out denied by the dipshits actually making the call if it's not what they want to hear.

Like they did publicly. On this conflict. To the press.

[–] Saleh@feddit.org 9 points 15 hours ago

The US intelligence community kept asserting that Iran is not pursuing a nuclear weapon as late as Spring 2025.

Nothing of this was based on consistent intelligence.

[–] surewhynotlem@lemmy.world 1 points 22 hours ago

Why would we bother with that level of analysis just to distract people from ICE raids?