this post was submitted on 25 Jun 2025
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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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[–] [email protected] 27 points 22 hours ago (6 children)

From this article it sounds very likely that the bunker buster attack failed.

[–] [email protected] 9 points 17 hours ago (1 children)
[–] [email protected] 1 points 11 hours ago (1 children)

But the information still seems valid.

[–] [email protected] 2 points 9 hours ago

It's confirming your bias so you like it...

[–] [email protected] 19 points 21 hours ago (1 children)

And I read that the US used more than half of its stock of these bunker-buster bombs in this attack, the largest conventional bunker-busters in existence. So they can't simply try again.

[–] [email protected] 26 points 21 hours ago* (last edited 21 hours ago) (1 children)

By your math, they absolutely can simply try again: one more time.

By my math, the bunker-buster bomb makers just got a big new contract.

something something DOGE of WAR something...

[–] [email protected] 11 points 21 hours ago

They can try one more time but worse

[–] [email protected] 12 points 21 hours ago (2 children)

I mean they usually only do about 30 damage anyways.

Source

[–] [email protected] 3 points 11 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.

[–] [email protected] 3 points 19 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

[–] [email protected] 2 points 16 hours ago

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

[–] [email protected] 8 points 21 hours ago

My guess: that bunker buster attack was twice as successful as the missile attack on the the airfield in Qatar.

2 x 0 = 0.

Now accepting bets on when we will find out that Trump had a secret call with Ali Khamenei where they negotiated the whole thing ahead of time, thus explaining the movement of the Uranium out of the facility, the movement of our servicemen out of the airbase, etc. etc.

[–] [email protected] 7 points 21 hours ago

Why? The kinds of UHPC being discussed in the article weren't available even in the United States until the year 2000 but most of Iran's nuclear facilities were built between 1974 and 2005. Even their primary enrichment facility in Fordow, which was struck with MOPs, was started no earlier than the mid-2000s as it was still unfinished in 2009.

Basically the majority of Iran's facilities, even their major ones, are too old to have the kind of concrete being discussed in the article.

[–] [email protected] 4 points 21 hours ago

That's what they want you to think, but we have no evidence to either direction. And I doubt we will ever have a definitive answer.