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Politics : Bush-The Mastermind behind 9/11? -- Ignore unavailable to you. Want to Upgrade?

To: Orcastraiter who wrote (15448)	9/11/2006 6:51:23 PM
From: TigerPaw	Read Replies (1) \| Respond to of 20039

WTC floors wtc.nist.gov

To: Orcastraiter who wrote (15448)	9/12/2006 12:25:11 AM
From: David Howe	Read Replies (1) \| Respond to of 20039

<<< High rise floors are generally made from normal concrete. In the case of the WTC I believe they were nearly 4 inches thick and they were reinforced with steel rebar and were poured over steel corregated B type decking. >>> Corregated type B steel decking. Agree 4 inches thick (when measured to the deep part of the decking). Agree Reinforced with steel rebar. Probably not, probably a layer of steel mesh which would have been fairly negligible in the collapse. Normal concrete. Agree, probably "normal". Definitely not the the high psi spec that the core areas were made of, but a lower psi mix. Maybe lightweight or standard, it doesn't make a big difference, neither have much in the way of tensile strength and would fall apart fairly easily except under even compression.