Falling Concrete Experiment

Does Concrete Really Pulverize into Dust when it Falls?
YouTube Version

Principal Investigator: Professor R. Shaddock
Safety Checker and Independent Witness: R. Stone Esq.
Safety Checker and Camera person: D. McCarthy

Abstract: This experiment is to test the hypothesis that concrete pulverizes in to dust when it falls, as claimed by the official 9/11 Commission Report about the World Trade Centers.  If concrete turns to dust so easily, the world needs to find a stronger, non-exploding building material.  Blocks of concrete were purchased to fall from a 5th floor balcony.  It was found that the concrete cracked, but did not create a significant amount of concrete dust.  Thus, this ground breaking study is a Myth Buster, as well as a concrete buster. We need a new investigation commission, with scientists not politicians, to find out what really happened on September 11, 2001.

Purpose: To test the hypothesis that concrete pulverizes in to dust when falling on to other slabs of concrete, as it did at the World Trade Center sites on September 11, 2001.  A literature review did not locate a similar study, so we decided to do this ground breaking, or at least concrete breaking, study.

David Ray Griffin PhD, speaking at the University of Wisconsin, said:
"Try this. Get a piece of concrete and drop it, a little over 1000 feet, and see if it pulverizes in to very fine dust. It won't happen."  YouTube.com    21:00 minutes point

Materials: Balcony, video camera, 2 concrete blocks (top and bottom).  The original plan for the experiment was to use concrete blocks with nano-thermite explosives in it, as was found in the World Trade Center dust.  The Home Depot staff did not know of any in stock, nor when they might have any for sale.  So the experiment had to be done with regular standard concrete slabs.

Methodology:  A concrete landing block was placed at the bottom of a balcony at a condominium complex.  Another concrete block would be dropped on top of it, from a distance of 50 feet, or 15.24 meters.  The fall was recorded on video for the scientific community to review.

Safety Precautions:  For anyone who replicates this experiment, be sure to remember "safety first before science."  An orange safety cone was placed on the side walk to warn possible pedestrians.  A watchman was posted to make sure no one walked in the way during the experiment, especially the Condo Manager or Security.  A concrete block was dropped from the 5th floor balcony and the results were photographed.

Hypothesis: It was hypothesized that the concrete would completely pulverize in to clouds of dust, as was found on 9/11.  The contrary hypothesis of "Truthers" is that there should have been a stack of concrete floors, like the buildings that collapsed from an earth quake in Ahmedabad, India.

We would expect to find that dust will blanket the condo grounds, without any large chunks of concrete. Only a small broom, dust pan, and possibly a vacuum cleaner should be necessary for cleanup.  This experiment should replicate the events of 9/11, and confirm the conclusion of the official 9/11 Commission Report.

Huge billowing clouds of concrete dust
spread for miles from Ground Zero

A thick layer of concrete dust blankets
everything in lower Manhattan Island.

Red and gray layers of explosives in the dust
(AlFeO2) as seen under an electron microscope


Materials from wife's flower table are better
used for for the purpose of science.

Position the "target" landing block
on the grass, to protect the sidewalk

Position an orange landing cone for
safety first to warn any pedestrians.

Concrete block to be dropped

Position block to be dropped

Watch out for any pedestrians

Ready to drop

Just dropped

At the 4th floor

At the 2nd floor

Hits bottom. Crack!

Dropping the concrete block to the landing site, marked by the orange safety cone. (Click for AVI video)

View of the concrete smashed in to bits

Result of concrete dropped from above

Large chunks were intact.  No significant dust.

The hypothesis failed that there would only be dust to clean up.  There were large chunks.

Conclusion of experiment
shows concrete chunks on the ground.

Condo Maintenance man came by to remove
the concrete chunk experiment samples

Calculations: The concrete fell 5 floors, at 10 feet per floor, for a distance of 50 feet, or 15.24 meters.  The rate of fall was approximately 32 feet per second per second, or 9.8 meters per second squared.  The duration of the fall was timed at about 2.1 seconds.  At impact, the concrete slab was traveling at a rate of 64 feet per second, or 43.64 miles per hour, or 70.23 kilometers per hour.

There were large pieces of concrete, and only a small amount of concrete dust.

Conclusion: Despite the hypothesis, and the conclusions of the official 9/11 Commission, concrete does not crumble in to dust when falling on to concrete, at least from 50 feet.  A replication study should be done with the same thickness of concrete that the World Trade Center had. 

Therefore, we have "concrete evidence" that the Official Conspiracy Theory (OCT) of the 9/11 Commission was not scientific, and contained errors that can be shown by simple home experiments.  It indicates that the Government is covering up something from the American citizens.  The conclusion that concrete does not pulverize without explosives, based on an easily replicable study (simply drop a block of concrete and see for yourself), is on solid ground.

Some other explanation is needed to explain the voluminous clouds of concrete dust found at Ground Zero.  One explanation that explains it perfectly is controlled demolition, using pre-planted nano thermite explosives in the World Trade Center buildings, during the largest elevator modernization project in history done by ACE Elevator Company under the supervision of SecuriCom security services during the months up to 9/11/2001.  We verified at Home Depot that it is not easy for terrorists to buy this controlled explosive substance.  Further experiments and another formal 9/11 investigation should focus on that explanation.

Click for Video

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Demand a new scientific investigation of 9/11

"Only an alert, and knowledgeable citizenry can compel the proper meshing of the huge industrial and military machinery of defense with our peaceful methods and goals, so that security and liberty may prosper together."
President and General Dwight D. Eisenhower


Raise American Consciousness and Alertness

"The next sounds you hear will be hundreds of Americans around our country replicating this study for themselves.  Then next sounds should be citizens knocking at the doors of their Congressmen, demanding an end to the lies about concrete dust and other aspects of ground zero, and the start of a new, scientific 9/11 investigation."  - Robert Stone, Esq.

"The 'magic concrete dust' theory of 9/11 is about as stupid as the 'magic bullet' theory of the Kennedy assassination, anomalies of physics that the American public is supposed to swallow." - George K.

Sample letter demanding a new, scientific investigation

Experiments you can do at home to test the official story







 James Randi Critical Thinking Forum on 9/11