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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 week ago by [email protected] to c/[email protected]

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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] 17 points 1 week ago* (last edited 1 week ago)

Basically they used pyramid age tech to outplay billions of dollars worth of weapons tech.

[-] [email protected] 9 points 1 week ago

Hardly. Did you read the article?

[-] [email protected] 6 points 1 week 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.

https://en.wikipedia.org/wiki/Reinforced_concrete?wprov=sfla1

Maybe the commenter was thinking of adobe.

[-] [email protected] 1 points 1 week ago

And this tech goes way beyond merely "reinforced".

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this post was submitted on 25 Jun 2025

309 points (81.2% liked)

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