In a First, America Dropped 30,000-Pound Bunker-Busters—But Iran’s Concrete May Be Unbreakable, Scientists Say
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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
schrieb am 26. Juni 2025, 13:17 zuletzt editiert vonLook up pykrete, it’s actually a really cool material
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Very much not.
Tactical means immediately useful. E.g. use against troops.
Strategical means mediately useful. E.g. use against infrastructure and production capacity. Also massively killing civilians. This is where most heinous war crimes live.schrieb am 26. Juni 2025, 13:18 zuletzt editiert von flightyhobler@lemmy.world -
immediately
mediately
schrieb am 26. Juni 2025, 13:24 zuletzt editiert vonOne means directly, one means by middle man. E.g. a president is elected mediatly by electing a law giving council that then votes on who becomes president. As opposed to the people electing said president directly.
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It is like a rifle vs. a cannon.
Yes it is functionally the same, but the "bullet" is much much larger.
schrieb am 26. Juni 2025, 13:29 zuletzt editiert vonNot really. More like a cannon and an artillery aimed at industrial capacity.
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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
schrieb am 26. Juni 2025, 15:58 zuletzt editiert vonI think that was kinda the idea - war production meant steel was in great demand, and this seemed like a really cheap way to make ships. I wouldn't want to try sailing one round the Caribbean, but they might have been okay in the north sea, for example. They didn't work out though, can't recall why but it's not impossible that melting may have been a factor!
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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.”
schrieb am 26. Juni 2025, 16:10 zuletzt editiert von"no, these missiles only bust the bunkers we tested them on."
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I think that was kinda the idea - war production meant steel was in great demand, and this seemed like a really cheap way to make ships. I wouldn't want to try sailing one round the Caribbean, but they might have been okay in the north sea, for example. They didn't work out though, can't recall why but it's not impossible that melting may have been a factor!
schrieb am 26. Juni 2025, 17:08 zuletzt editiert vonThe idea was to build giant floating barges in the mid North Atlantic for sub hunting escort aircraft to refuel halfway across. The escort aircraft at the time couldn’t stay with the convoys the whole way, leaving a stretch in the mid Atlantic where they were vulnerable. An ice runway would allow aircraft to cover the convoy for the entire passage, and in the North Atlantic would last months (if not longer) before melting.
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Unfortunately (?) HF is a gas.
inste-edit: I know I'm being pedantic and a reasonable concentration of hydroflouric acid is what you were talking about.
There was an article somewhere about a 1 tonne spill on chlorine triflourideschrieb am 26. Juni 2025, 17:52 zuletzt editiert vonThere was a "etch your VIN in your car window glass" campaign around here years back, they had a liquid solution of HF that they were wiping across printed stencils to do the glass etching. The fact that its natural state is a gas just makes it all the nastier to handle - and possibly even more effective at diffusing through the cracks to cause hydrogen embrittlement of any steel reinforcement it may come into contact with.
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They mean mixing in steel dust or nylon hair?
Hard to believe this is a recent enough thought.
schrieb am 26. Juni 2025, 18:42 zuletzt editiert vonFiberglass, carbon fibers, or small steel wires. They don't need to be long, the snippets are only a few centimeters in the video I have seen.
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rest of Tokio is mostly intact
and housing becomes much more accessible too when buildings are intact but their inhabitants have much shorter lives because of radiation
schrieb am 26. Juni 2025, 18:47 zuletzt editiert von deathbybigsad@sh.itjust.worksdeleted by creator
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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.”
schrieb am 26. Juni 2025, 18:55 zuletzt editiert vonIf it's reinforced steel concrete, it would be much harder to bunker bust.
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I suspect the world would be safer if everyone just let Trump think he won.
schrieb am 26. Juni 2025, 19:13 zuletzt editiert von x00z@lemmy.worldThat's impossible. "Make America Great Again" is a slogan that he can only abuse as long as there are problems. If he wants to stay in power it's in his best interest to create problems. It's what fascists dictators have been doing since forever. Even if there are no problems they will point towards something and make you think it is a problem, so they can market themselves as the solution. If he would "win" he would lose his power, which is obviously the opposite of what somebody like Trump wants.
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They mean mixing in steel dust or nylon hair?
Hard to believe this is a recent enough thought.
schrieb am 26. Juni 2025, 19:35 zuletzt editiert von -
I doubt it's a recent thought, knowing civil engineers, they're absolute perverts when it comes to concrete.
schrieb am 26. Juni 2025, 20:29 zuletzt editiert vonIt 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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I think that was kinda the idea - war production meant steel was in great demand, and this seemed like a really cheap way to make ships. I wouldn't want to try sailing one round the Caribbean, but they might have been okay in the north sea, for example. They didn't work out though, can't recall why but it's not impossible that melting may have been a factor!
schrieb am 26. Juni 2025, 20:33 zuletzt editiert vonFuel requirements could get to astounding levels, even with ambient air and water temperatures below 0C any "hot stuff" onboard (engines, lights, radios, people) would have to be offset with some kind of refrigeration system, which requires: more fuel to be burned. I'm sure you can "stay ahead of things" in some environments, but it won't be cheap on the fuel side of things.
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I never really got why tactical and strategic nukes are so wildly different. Aren't those words more or less synonyms?
schrieb am 26. Juni 2025, 20:35 zuletzt editiert vonIn 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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That's impossible. "Make America Great Again" is a slogan that he can only abuse as long as there are problems. If he wants to stay in power it's in his best interest to create problems. It's what fascists dictators have been doing since forever. Even if there are no problems they will point towards something and make you think it is a problem, so they can market themselves as the solution. If he would "win" he would lose his power, which is obviously the opposite of what somebody like Trump wants.
schrieb am 27. Juni 2025, 10:35 zuletzt editiert vonThat is depressingly insightful. See also: the internal war on everyone who isn't a middle-aged white cis het man (and even some of them, too). Just negativity all around.
What really brings me down it's the certainty that even if that is guy was suddenly not there anymore, there is a whole gaggle of like folk ready to continue that same rhetoric. How do you even dig yourselves out of that?
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That is depressingly insightful. See also: the internal war on everyone who isn't a middle-aged white cis het man (and even some of them, too). Just negativity all around.
What really brings me down it's the certainty that even if that is guy was suddenly not there anymore, there is a whole gaggle of like folk ready to continue that same rhetoric. How do you even dig yourselves out of that?
schrieb am 27. Juni 2025, 18:45 zuletzt editiert vonThat is depressingly insightful. See also: the internal war on everyone who isn’t a middle-aged white cis het man (and even some of them, too). Just negativity all around.
Yes. Separating the people is an extremely strong tool in the authoritarian handbook. It is such a strong tool that the things it accomplishes are too much to list here. There are a lot of books on the matter. I think it's even explained in some of the CIA books.
What really brings me down it’s the certainty that even if that is guy was suddenly not there anymore, there is a whole gaggle of like folk ready to continue that same rhetoric. How do you even dig yourselves out of that?
This is not completely correct. People fighting back against their oppressors sends an extremely strong message. And it even goes both way. For example, the attack on the USA Capitol of January 6th gave these Magazis a lot of power because they saw unity in their oppression.
The good thing is that there's always more good people than bad.
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deleted by creator
schrieb am 30. Juni 2025, 11:38 zuletzt editiert von"Eventually" might be a long time with radiation.
20 years after the Chernobyl disaster the level of radiation was still high enough to give you a good chance of cancer if you went to live there for a few years.
Radiation levels now | The Chernobyl Gallery
Radiation levels in the Chernobyl exclusion zone and the effect of the nuclear disaster on visitors today.
The Chernobyl Gallery (www.chernobylgallery.com)
I don't know how much radiation these "tactical" weapons release, but if it's comparable to Chernobyl, even if the buildings were not originally damaged, I don't know how fit they would be for living after being abandoned for 30 or 40 years.
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"Eventually" might be a long time with radiation.
20 years after the Chernobyl disaster the level of radiation was still high enough to give you a good chance of cancer if you went to live there for a few years.
Radiation levels now | The Chernobyl Gallery
Radiation levels in the Chernobyl exclusion zone and the effect of the nuclear disaster on visitors today.
The Chernobyl Gallery (www.chernobylgallery.com)
I don't know how much radiation these "tactical" weapons release, but if it's comparable to Chernobyl, even if the buildings were not originally damaged, I don't know how fit they would be for living after being abandoned for 30 or 40 years.
schrieb am 30. Juni 2025, 19:19 zuletzt editiert von deathbybigsad@sh.itjust.worksdeleted by creator
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