Why the twin towers collapsed? Response is received. http://mignews.com/news/technology/world/210911_205844_27086.html
21.09 21:13 MIGnews.com
The combination of fire suppression systems (water spray), and the molten aluminum from the airframe, probably caused the explosions that hit the twin towers in New York on 11 September 2001. This was reported by an expert on the technical conference held on Wednesday, September 21.
"If my theory is correct, per tonne of aluminum flowed down the tower, where the melt came in contact with several hundred gallons of water," - said Christian Siemens, a scientist at SINTEF, the independent technology research institute, based in Norway.
"On the basis of other accidents, and scientific experiments carried out in the aluminum industry, we know that reactions of this kind lead to spontaneous explosions" - he added.
The official report into the twin towers collapse blamed overheating and failure of structural steel beams in the center of the building. Siemens rejects these explanations.
Given the amount of molten metal explosions were powerful enough to destroy the inner section of each building, he said. This, in turn, led to the upper part of each tower fell on the lower section.
Net weight of the upper floors was enough to crush the lower part of the building as a house of cards.
"Aluminum-water scenario" also explains the explosions inside the building shortly before the fall, but then there was "conspiracy theory" - assumed that the inside of the towers were booby-trapped.
Siemens not only presented his theory at the International Conference on Materials Technology, San Diego, California, but detailed calculations presented in an article published in the journal Aluminium International Today.
"The aluminum industry since 1980, officially registered more than 250 explosions due to contact with water, straightened aluminum" - said the speaker.
In a controlled experiment conducted by Alcoa Aluminium, 20 kg of molten aluminum reacted with 20 liters of water in the presence of small amounts of rust. As a result, the explosion destroyed the entire lab and left a crater 30 meters.
For comparison: the aircraft, according to calculations of Siemens, "delivered" in each tower to 30 tons of aluminum, not less.
Siemens assumes that the two jets were immediately trapped inside the towers of the insulating layer of debris.
Garbage - especially plaster, which blocks the transfer of heat - as though to create a defense for the rest of the building.
But at the same time, it appeared the aircraft around a super-hot area like the furnace, which was further heated by the combustion of fuel.
Aluminum alloy, which in the corps jets also contains magnesium, melts at 660 degrees Celsius (1220 degrees Fahrenheit). When heated to 750 C (1382 F), alloy "is as fluid as water," - said Siemens.
This molten aluminum can drip down the stairs and through the cracks in the floor, causing a chemical reaction with water from the sprinklers, including at lower levels.
Melting period - from 30 to 45 minutes - meets (since the attacks), the time of explosions and the subsequent collapse of both buildings.
As noted by Siemens, if his theory is correct, then we can draw lessons that can help prevent such disasters, if another big plane falls on a skyscraper.
"We could develop mechanisms for rapid emptying of splashing water on the floors below the impact point," - he said.
Or, for example, to install automatic fire back with a rocket flame retardant content, which would cover the body and help prevent the plane of the metal melting.