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4.
THIS IS ONLY A TEST
Through
their years of experience, most blasters are very good at
estimating the amount of explosives needed to eliminate
a specific type of concrete column or steel beam. But it
helps to make absolutely sure.
DID YOU KNOW that on most major explosive
demolition projects, the blaster initiates a 'test blast'
several days before the actual demolition?
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This usually
involves selecting a few columns of varying size and width, then
destroying them with slightly varying amounts of explosives. The
resulting fragmentation will enable the blaster to calculate the
smallest amount of explosive necessary to cause the failure of
any given column. Finding this 'failure threshold' is critical
because it helps to minimize the amount of flying debris, which
in turn minimizes the possibility of damage to adjacent structures.
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