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Originally posted by bsbray11
NIST could not determine what actually caused the corrosion. They even said this themselves.
Originally posted by Seymour Butz
While it's true that NIST is unable to determine WHERE the sulfur came from, that doesn't mean that they don't undertand the process that thinned the steel.
One piece Dr. Astaneh-Asl saw was a charred horizontal I-beam from 7 World Trade Center, a 47-story skyscraper that collapsed from fire eight hours after the attacks. The beam, so named because its cross-section looks like a capital I, had clearly endured searing temperatures. Parts of the flat top of the I, once five-eighths of an inch thick, had vaporized.
Less clear was whether the beam had been charred after the collapse, as it lay in the pile of burning rubble, or whether it had been engulfed in the fire that led to the building's collapse, which would provide a more telling clue.
The answer lay in the beam's twisted shape. As weight pushed down, the center portion had buckled outward.
''This tells me it buckled while it was attached to the column,'' not as it fell, Dr. Astaneh-Asl said, adding, ''It had burned first, then buckled.''
Originally posted by gottago
Re: Freshkills, pure coincidence about the name, its the largest landfill near Manhattan, though ghoulish you're right there.