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 5 days 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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[–] DeathByBigSad@sh.itjust.works 1 points 6 hours ago* (last edited 5 hours ago)

Hiroshima and Nagasaki is currently livable because the bomb was detonated in the sky, the radiation disappates quickly.

In constrast, Chernobyl had much more fuel and since the power plant was on the ground, it contaminated a lot of the soil, therefore, it's gonna take much much longer before Chernobyl is ever livable again.

A tactical nuke is a bomb that will detonate in the air, and since its "tactical", its gonna have much less yield. Its gonna be become livable again even quickly than Hiroshima and Nagasaki.