Originally Posted by
husaberg
You get more than three lines regardless as you raised about four topics.
With the dust from ChCH you missed the point, concrete when its crushed under pressure creates huge amounts of dust.
Due to the sand and cement particles that make up about 1/2 of the concrete when its cured.
off the top of my head Concrete sand is generally less than 4mm with an average partical size of 1.8-2.8mm to start with its doesn't turn into a different form, but it forms a composite.
Concrete is about 1/2 ag (Ie Gravel) which i either 13mm or 19mm max size. Plus 1/2 sand and various amounts of Cement. but around 200-250KG per 2.5 tons for GP stuff 400 kg plus for bridges etc./M3
the fine dust from breaking down concrete, actually kills thousand of people a year. this is due to the ultra fine silica content of most sands and also was often used in concrete as an ad mixture Mirco silica.
that's why when you crush it,As when you test it you keep it wet, same when you cut it, also why you wear masks when you cut it.
No need for nukes or earthquakes.
There was a shit load of energy concentrated when the buildings collapsed F=MA.
its a accumulated collapse with each floor adding to the mass and speeding up the collapse, therefor adding for and more energy as it collapses, this energy is concentrated over a small area,
The bomb blasts on the other hand dissipate energy in the open atmosphere. from memory one of the Japanese sites was chosen as it was in a basin to concentrate the effects of the blast. To maximize the damage.
No one has ever produced a single piece of conclusive evidence that the WTC attacks were anything other than plane crash related.
if you look at the videos i posted the dust was from the concrete simply falling and breaking.
here is dust from a building collapsing due to shoddy construction. Notice the dust and its only a small building.
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