this post was submitted on 25 Jun 2025
299 points (81.1% liked)

Technology

72425 readers
2709 users here now

This is a most excellent place for technology news and articles.

Our Rules

  1. Follow the lemmy.world rules.
  2. Only tech related news or articles.
  3. Be excellent to each other!
  4. Mod approved content bots can post up to 10 articles per day.
  5. Threads asking for personal tech support may be deleted.
  6. Politics threads may be removed.
  7. No memes allowed as posts, OK to post as comments.
  8. Only approved bots from the list below, this includes using AI responses and summaries. To ask if your bot can be added please contact a mod.
  9. Check for duplicates before posting, duplicates may be removed
  10. Accounts 7 days and younger will have their posts automatically removed.

Approved Bots

founded 2 years ago
MODERATORS
L3s@lemmy.world
enu@lemmy.world
technopagan@lemmy.world
L4s@lemmy.world
L3s@hackingne.ws
L4s@hackingne.ws
299
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
103 comments fedilink hide all child comments
 

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.”

you are viewing a single comment's thread
view the rest of the comments
[–] MangoCats@feddit.it 2 points 1 week ago (9 children)

You triggered a thought: what if those bunker busters carried a payload of corrosive material, something that the explosive event could deeply embed into the concrete, slowly degrading its strength - possibly until total failure?

[–] FaceDeer@fedia.io 9 points 1 week ago (4 children)

What material would that be? Corrosives have limits, they can't just keep dissolving stuff forever.

And what would "total failure" look like? It's a mountain, it's not going to just collapse into goo.

[–] EndlessNightmare@reddthat.com 1 points 1 week ago (1 children)

Blood of xenomorphs from the Alien movies

[–] FaceDeer@fedia.io 2 points 1 week ago

That's a work of fiction. You might as well suggest dropping lightsabres on the bunker.

load more comments (2 replies)
load more comments (6 replies)