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OK, since it was mentioned, I am also upset with the quantity of concrete dust (see http://www.civil.usyd.edu.au/wtc.htm#why or http://www.public-action.com/911/jmcm/usyd/index.htm#why ). No concrete that I have ever known pulverizes like that. It is unnerving. My experience with concrete has shown that it will crumble under stress, but rarely does it just give up the ghost and turn to powder. But look at the pictures — it is truly a fine dust in great billowing clouds spewing a hundred feet from the collapsing tower.
The University of Sydney — Department of Civil Engineering |
