World Trade Center Concrete

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The World Trade Center Twin Towers each had 110 floors covered with 4" of lightweight concrete. NCSTAR1_p60


Floor construction typically consisted of 4 inches of lightweight concrete on 1-1/2-inch, 22-gauge non-composite steel deck. In the core area, slab thickness was 5 inches. fema.gov

NCSTAR1-2_p228


Back of the napkin calculation:

4.35 in thick @ 36.5 pounds per square foot

each floor is 1 acre = 43530 ft^2

43530 ft^2 * 86.5 lb/ft^2 = 1,589,940 lbs/floor = 721,184 kg/floor = 795 short tons of lightweight concrete per floor * 110 = 87,446 short tons per building.


Most of the concrete from the WTC site was pulverized into dust in the Sept. 11 attacks. But huge amounts of structural steel remained scattered in tangled heaps, says Allen Morse, USACE chief debris expert and FEMA technical advisor. wasteage.com


We found out what a powerful force gravity is. Everything was completely pulverized. You saw gray dirt, which was pulverized concrete, and you saw beams and you saw pipes, basically, with a lot of wires around. You didn't see anything identifiable beyond those three things, and pieces of paper every place. You didn't see a chair, a desk, a computer screen. I never saw a piece of glass the whole time I was there. —Firefighter-special-operations panel member rand.org


WE RUN IN FEAR OF OUR LIVES THE ENTIRE NORTH TOWER COLLAPSES AND WE ARE NOT GOING TO OUTRUN THE TREMENDOUS CLOUD OF ASH AND DEBRIS THAT IS TOPPLING DOWN AND BULGING OUTWARDS KEVIN AND DIVE UNDER FIRE TRUCK WHILE LIEUTENANT BOREGA HARRY AND STEVE TAKE REFUGE BEHIND OR UNDER OTHER PARKED APPARATUS HUG THE GROUND IN FETAL POSITION PROTECTING MY EYES AND FACE FROM PELLETS OF CONCRETE THAT ARE BOUNCING OFF MY FIRE HELMET AND BODY -Hugh Mettham FDNY nytimes.com


A variety of concrete spectra are available:

http://pubs.usgs.gov/of/2005/1165/table_1.html

CONCRETE-06-IMAGE.jpg

NCSTAR_1-1A_Figure_2-3.png

1-1A_noPW.pdf NISTNCSTAR_1-1A_p43

4.35 in thick @ 36.5 pounds per square foot

each floor is 1 acre = 43530 ft^2

43530 ft^2 * 86.5 lb/ft^2 = 1,589,940 lbs/floor = 721,184 kg/floor = 795 short tons of lightweight concrete per floor * 110 = 87,446 short tons per building.

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http://911research.wtc7.net/papers/dustvolume/volumev3_1.html

I just waited and the smoke caught up with me and I could hear the beams and the rocks, you know, pieces of rock would hit me on the helmet and I just hid behind the ambulance. It seemed like forever. -Fire Marshal Michael Cain nytimes.com

I TURNED AROUND TO LOOK TO SEE WHAT WAS HAPPENING AND THE CLOUD HAD JUST ENVELOPED ME AND I GOT CLOCKED IN THE HEAD WITH A PIECE OF CONCRETE WHICH HAD KNOCKED ME TO THE GROUND -CAPTAIN WILLIAM MCLAUGHLIN FDNY ENGINE 312 nytimes.com

http://911research.wtc7.net/wtc/analysis/collapses/concrete.html

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