Of course it's viable. Just not very practical when we are talking about several thousand tons. Gravity will do it for you.
But what do you think?
Modern Uses of Thermite for Demolition and their applicability to the WTC
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Of course it's viable. Just not very practical when we are talking about several thousand tons. Gravity will do it for you.
But what do you think?
Alienentity
Active Member
Nobody's seen an LTC used on a structural steel-type column, so nobody can claim that it would be viable. It's unknown and unproven.
Viable way to crush concrete is mechanical thru gravity. Fire can't do it, neither can explosives. The idea of destroying all that concrete with LTC's is not viable.
Viable way to crush concrete is mechanical thru gravity. Fire can't do it, neither can explosives. The idea of destroying all that concrete with LTC's is not viable.
So you have an example of gravity doing this on such a scale? Please provide it.
Otherwise that's just another bare assertion.
Let's keep on topic please. Thermite demolition devices and their applicability. There are plenty of threads discussing gravity and suchlike.
Alienentity
Active Member
The first step towards linking the LTC concept with large building demolition would be to find a documented example of it.
Or at least show the requirements for cutting a large column - you'd need to know the weight of thermite required and the burn time to do the job.
Nobody has that data here so far.
Or at least show the requirements for cutting a large column - you'd need to know the weight of thermite required and the burn time to do the job.
Nobody has that data here so far.
Alienentity
Active Member
A thermite LTC can cut a hole in concrete. So can a drill. But you don't use a drill to make sawdust anymore than you could use a thermite cutting device to render (and why would you even want to!) masses of concrete into rubble.
I think it was you who brought the topic of gravity into it Mick, in post #41.
LLNL have been researching the use of thermitics on behalf of the US govt for years before 911. I suggest you take a look at their work before you continue.
1.5 - 3 lbs per cut, already mentioned on this thread. Less for bottom up made nano material.
Could you link me to some that they say is applicable to demolition?
Wasn't that for 0.5" steel? How much for 3"? Has cutting 3" steel even been demonstrated with such a charge?
And why exactly would the "nano" material require less mass?
This demonstrates a lack of understanding of what LLNL and other chemists do. The application of the material is not their concern. The manufacture of it is.
The thread is about modern uses of thermite for demolition.
"Monomolecular materials such as TNT work fast and thus have greater power than composites, but they have only moderate energy densities-commonly half those of composites. "Greater energy densities versus greater power—that's been the traditional trade-off," says Simpson. "With our new process, however, we're mixing at molecular scales, using grains the size of tens to hundreds of molecules. That can give us the best of both worlds-higher energy densities and high power as well." ~ Randy Simpson, director of the Energetic Materials Center;
Yes, and you have to manufacture the material, and then you have to configure a device to use it in. Both these things are relevant, and have been demonstrated on this thread.
But you are simply hypothesising. Has there ever been an actual use of "nano" thermite for cutting something? How thick was the steel it cut?
Not hypothesising at all. I showed you a US govt expert saying that such nano composites are far more powerful that a standard top down composite and you have seen an example on this thread of the latter cutting steel. Are you saying that the bottom up nano material could not do what a less efficient material demonstrably can and has done?
I think this sub-discussion deserves a separate thread. There are some fundamental questions it would be good to air.
I've created a new thread for discussing how much better nanothermite would be than thermite for cutting thick steel:
https://www.metabunk.org/threads/nanothermite-vs-thermite-thermate-for-cutting-thick-steel.2873/
https://www.metabunk.org/threads/nanothermite-vs-thermite-thermate-for-cutting-thick-steel.2873/
Alienentity
Active Member
I've been looking to see if there are any building demolitions which have utilized LTC technology. Here is another patent application '
If you read carefully the invention is designed for cutting efficiently by the use of casings and nozzles, and must be firmly attached by use of bolts to the material to be cut. This type of device would also require a steel column, for example, to be completely exposed so the device could clamp around it. It is clear that any structure which is to be affected would require a great deal of careful preparation, but one can imagine it would be a safe and useful tool when dismantling a large ship, for example, in a scrap yard.
As expected, a LTC is not as fast as a high-explosive cutting charge, but is safer because there is no ultra-high velocity shockwave which could endanger workers. The ultimate speed is not important for metal scrapping or dismantling, and one section of a structure can be safely addressed at a time. For this reason it is fairly obvious that this type of device has no known application in terms of replacing high explosives for large building implosions.
Taking something apart piece by piece? Yes, it's designed for that.
'
a) key structure out of the way exactly when needed
b) a desired sequence and direction of building implosion so as not to damage surrounding urban environments
There's no indication that LTC was designed for or has been used for implosions. Annoyingly when one attempts to search for such applications one just runs into dozens of 9/11 conspiracy websites postulating the use of thermite.... doh! Lots of chaff but no wheat so far..
The page is hereU.S. Provisional Application No. 60/659,677 filed Mar. 8, 2005.
If you read carefully the invention is designed for cutting efficiently by the use of casings and nozzles, and must be firmly attached by use of bolts to the material to be cut. This type of device would also require a steel column, for example, to be completely exposed so the device could clamp around it. It is clear that any structure which is to be affected would require a great deal of careful preparation, but one can imagine it would be a safe and useful tool when dismantling a large ship, for example, in a scrap yard.
As expected, a LTC is not as fast as a high-explosive cutting charge, but is safer because there is no ultra-high velocity shockwave which could endanger workers. The ultimate speed is not important for metal scrapping or dismantling, and one section of a structure can be safely addressed at a time. For this reason it is fairly obvious that this type of device has no known application in terms of replacing high explosives for large building implosions.
Taking something apart piece by piece? Yes, it's designed for that.
'
A typical building implosion requires sometimes dozens of carefully timed cutter charges in order to getWhile the projected thermite charge particle stream is a slower reaction than that of an explosively driven jet, it is very fast from the perspective of the operator. The anticipated timing for material penetration is typically on the order of hundreds of milliseconds.'
a) key structure out of the way exactly when needed
b) a desired sequence and direction of building implosion so as not to damage surrounding urban environments
There's no indication that LTC was designed for or has been used for implosions. Annoyingly when one attempts to search for such applications one just runs into dozens of 9/11 conspiracy websites postulating the use of thermite.... doh! Lots of chaff but no wheat so far..
Alienentity
Active Member
Further to my last post, one should also note that at the time of the 2005 application the cutting of thick steel was 'anticipated', but it seems this is a proposed use, not an actual tested practice.
It's worth keeping in mind that implosions also require 'kicker charges' to get the columns to move. Again the LTC is not designed to do this. It's certainly a very interesting an clever invention and no doubt has lots of practical uses.After deployment of the anchors, the initiation system will ignite the thermite and other energetics present in the system. It is anticipated that the jet will penetrate a ½ inch thick steel target in less than 1 second. This will allow for swift deployment through the breach into the area of interest for rescue or rapid entry applications, and timeframes conducive to commercial demolition applications
Here's one patent for a thermitic device to destroy concrete
"The present invention relates to an improvement in method and apparatus for demolishing concrete structures. In a specific aspect, the invention relates to method and apparatus for melting concrete." http://www.patentstorm.us/patents/5532449/description.html
How much concrete do you think was destroyed with thermite in the WTC? Do you think it was done with devices like this?
Alienentity
Active Member
I've also seen concrete broken up with a hydraulic pick. But nobody imagines that's what happened to the WTC concrete.
Using plasma ARC and thermite to demolish concrete
US 5532449 A
https://www.google.com/patents/US5532449
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