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 week 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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[–] rottingleaf@lemmy.world 7 points 1 week ago (14 children)

They mean mixing in steel dust or nylon hair?

Hard to believe this is a recent enough thought.

[–] BeardedGingerWonder@feddit.uk 19 points 1 week ago (8 children)

I doubt it's a recent thought, knowing civil engineers, they're absolute perverts when it comes to concrete.

[–] MangoCats@feddit.it 2 points 1 week ago

It has been around in some form since there has been manmade concrete.

Personally, I bought a box of chopped fibers for inclusion in a concrete project some 30 years ago - sold labeled for that specific use.

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