HASTY DEMOLITION OF CONCRETE STRUCTURES
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 13, 1961
- Accession Number
- AD0253357
Entities
People
- Howard J. Vandersluis
Organizations
- United States Army Engineer Research and Development Laboratory