I've witnessed reinforced concrete “destroyed” two ways, extreme pressures such as hammers and penetrators that leave the concrete destroyed structurally but generally left as its components as the gravel and such...and explosively to induce the speed of sound though the concrete and particulate it which requires explosives with speeds over 3200 meters per second. That will turn concrete and all its components into a fine powder.
I can't comment on why the building fell down, but what happened during and after I can have my own poorly informed opinion about.
The metal floor pans on each building were filled with almost a ft/acre each of reinforced lightened concrete. Thats almost 110 acres of concrete, each building. How did the 500,000 ton building in the act of falling, create enough energy to grind to a particulate mostly all of this concrete so fine it founted like Vesuvius and coated the surrounding area with up to 6 inches of the material that once resided in the falling “pancakes” as solid concrete.
To accomplish this with explosives some have estimated it would require about 2-300,000 tons per building.
See my dilemma? Leaves the conspiracy guys with a real problem, too. My eyes and limited experience allows me to opine it was blown to kingdom come, from the top down, 10 or more floors at a time, yet it would take probably 2-300,000 “tons” of explosives to do so. What energy other than the force of gravity on a falling object was present to make that much material capable of blowing away on the wind?
Therein lies the rub. Hard to hide 300,000 tons of really high explosives in 500,000 ton buiding, isn't it?
There was not, nor could have been any explosive. The amount of explosive you say it would take would likely have blown chunks of the towers all over New York State.
I don’t understand why anyone thinks that the area was coated in 6 inches of particulate concrete. That just is not true. There is video that show huge slabs of concrete. I don’t know what is so hard to understand.
There is also zero evidence of any explosive being used.
The buildings were just poorly designed, and likely built with low grade techniques.