HASTY DEMOLITION OF CONCRETE STRUCTURES
ARMY ENGINEER RESEARCH AND DEVELOPMENT LABS FORT BELVOIR VA
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A test program is presented in which improved techniques for the use of explosives against reinforced concrete structures were developed and utilized to establish the minimum explosive necessary to breach piers 1 to 8 ft thick. A subordinate objective of the tests was to enhance understanding of the principles surrounding the destructive effect of explosives on a target, research which has been valuable not only in validating the conclusions of the tests but also in providing a framework for further studies of concrete. The report concludes that 1 explosive placed at least the thickness of the pier above the base of a pier is more effective than explosive placed at the base 2 the relationship of thickness of charge to contact area is critical a material change from the optimum will significantly decrease destructiveness of the charge 3 central initiation of a charge is as effective as corner initiation or two-corner, simultaneous initiation 4 plastic placed between explosive and a concrete target does not significantly alter destructiveness of the explosive 5 on 1-foot-thick walls, mud confinement of the explosive TAMPING makes possible a 30 reduction in the weight of explosive required to achieve equivalent results and 6 a square charge is more effective than a rectangular charge. Optimum practicable charge sizes are as shown.
- Structural Engineering and Building Technology