Being a onetime proponent of concrete cores, I no longer buy that story.
There is no record of the concrete cores in any of the construction photos, save for the lower core columns.
In fact, there is no record of fleets of concrete trucks, or of concrete mixing taking place on site, or of shipping in the acres of sand, gravel and
cement required to mix it on site. The logistics required to pump concrete to such heights is further not considered, and there would be ample
photographic evidence to support it. Concrete contractors love to take photographs of their work; all contractors do; it is how they sell future
jobs.
To my knowledge, no photographs exist; not one concrete bucket, save for one short video and a few shots of one floor being poured. There are no
other photographs of the 10 million sq feet of floor space being poured or finished, nor any other photographs of the core columns as well. Nothing
from any of the proud contractors who would undoubtedly have poster-sized glossies of their fine finished concrete which helped hold up the tallest
buildings in New York City.
Furthermore, when considering the flex of these towers (they would twist and flex so much that on really windy days the freight elevators couldn't run
because the cables would slap against the elevator shaft), how well would poured concrete survive that kind of flex?
Here's a more thorough discussion:
letsrollforums.com...
edit on 19-12-2011 by septic because: (no reason given)