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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 month 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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[-] Regrettable_incident@lemmy.world 1 points 1 month ago

IIRC this type of thing isn't new - there was research into the possibility of making ships out of ice mixed with sawdust in WWII.

[-] OrteilGenou@lemmy.world 1 points 1 month ago* (last edited 1 month ago)

How is the fleet holding up?

We almost made it this time!

Oh well, let's freeze another fleet, wait for January and try again

this post was submitted on 25 Jun 2025
71 points (78.9% liked)

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