CONCRETE VS. STEEL
In the United States and Europe, support columns
in most buildings are constructed of either steel 'H-beams'
or concrete (with steel reinforcing bars). Some buildings actually
DID YOU KNOW that these two types of support columns
require two completely different types of explosives to cause
Concrete columns are generally easier to destroy, and usually
require a small amount of conventional dynamite packed into
specially drilled holes. Steel beams, however, require a very
high-velocity explosive to perform a 'cutting' action through
the steel. A specialized explosive called RDX, made famous by
NASA’s space program, is used to perform this task. This copper-encased
explosive is physically attached to the beam, and upon detonation
'slices' at an incredible 27,000 feet per second. A small amount
of conventional dynamite is also attached to the beam to 'kick'
it out of place so the structure will fall uniformly, in a direction
predesignated by the blaster.