Abstract 2008

2008
#1

Analysis of the Geometry of Drilled Holes in Demolition ABSTRACT

Paul Vincent M. Abanador, Hykinel Bon D. Guarte, David Nathaniel P. Tan

Implosion is a last-ditch demolition method, used when no other method will work for the situation, in terms of safety and cost. Implosions are more expensive and take complex calculations in order to proceed properly. This research aims to find the most effective arrangement of drilled holes that provides the most destructive force in a given foundation. The effect of a non-explosive demolition agent on a given foundation using different geometric arrangements should vary. The most effective arrangement was determined by measuring the degree of cracking. Number of cracks and crack lengths were used for comparison purposes. The concrete slabs used were 37.5 centimeters wide, 37.5 centimeters long and 2.5 centimeters thick. The drilled holes were 10 millimeters in diameter and the non-explosive demolition agent used was Bentonamit-R. There are a total of 9 concrete slabs used for the experiment. Treatments consisting of three different geometric designs of drilled holes were used: square, triangle, and hexagon. Three replicates were provided for each treatment. NEDA was prepared using 620 milliliters of water and 1 kilogram of Bentonamit-R. The solution was poured into each hole and the slabs were left to settle after two days. Only the slabs with the hexagon arrangement showed cracks after the first day of observation while the other six slabs did not incur cracks even after the second day. This trial provides enough evidence to verify the negative support provided by the hexagon configuration. The project utilized small concrete slabs whereas NEDA is formulated for destroying large infrastructures and quarrying. The project could be improved by providing more accurate simulation of the effects of NEDA and geometric arrangement of holes using larger concrete slabs or other similar materials. #2

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