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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[–] Rivalarrival@lemmy.today 62 points 1 week ago (15 children)

Sounds to me like someone is trying to justify actually using a tactical, atomic bunker buster.

[–] DeathByBigSad@sh.itjust.works 24 points 1 week ago (14 children)

tactical

Lol, they're gonna do the strategic one next

[–] Rubanski@lemm.ee 4 points 1 week ago (13 children)

I never really got why tactical and strategic nukes are so wildly different. Aren't those words more or less synonyms?

[–] MangoCats@feddit.it 5 points 1 week ago

In common usage they're equivalent to small and big. In practical terms, all nukes are strategic - use of a nuke has profound global diplomatic repercussions.

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