In article <on2tq25s086q1g6j8m4r4hlv95sj041dbc@4ax.com>, Starfish <Starfish@somewhere.com> wrote: > >Why did the World Trade Centers create so >much powdered concrete? >http://www.911review.org/Wget/www.nerdcities.com/guardian/Hufschmid/CloudsOfConcrete_2. html > >If you are looking for the physics problem: >How much energy was needed to crumble the buildings? > >The World Trade Center buildings did not simply "fall down". >Rather, both towers and building #7 crumbled into concrete >powder and small pieces of steel. By evening lower Manhattan >was covered with concrete powder up to several inches thick, >as if a volcano has erupted nearby. Why all the powder? Why >didn't the buildings just fall down or break into large pieces? > Why, why, why. Why don't you ask someone that knows about concrte and fire. Any chemistry student does. Each WTC tower is reported to be 500,000 tons, mostly steel and concrete. Most of the concrete in the WTC was in the form of 4 inch thick, unreinforced floor slabs supported by metal truss. By my calcualtion, it was 100,000 tons of concrete. All 4 inches thick. If I had access to an edge of one of those floors I could bust chucks off, a bit at at time, with my sledge hammer. Much of the remaining 400,000 tons was heavy steel beams. When the floors fell, the concrete immediatly broke up into rubble when the sheet metal gave way and in the fall of hundreds of ft much of it got groud up into finer dust by the metal. Wind carries *only* dust. Anything that wasn't dust fell onto the pile. (16 acres and *many* times the size of each tower footprint) The smoldering fires in the pile dehydrated concrete into dust, a fact well know to chemistry students and demoliiton experts (who woutinely cut concrete with Oxy torches.) A friend of mine is a retired NYFD fireman. he worked on the pile from the afternoon of 9-11, on. He descried the dust and decomposed concrete and thought it completely routine as to the chemistry and physics. -- a d y k e s @ p a n i x . c o m Harrison for Congress in NY 13CD www.harrison06.com Don't blame me. I voted for Gore. A Proud signature since 2001