Nabiullah,, M. and Singh, B. (1990) Influence of extraneous material on the impact sensitivity of explosives. Journal of Mines, Metals & Fuels, 38 (7&8). pp. 141-145. ISSN 0022-2755

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Abstract

Rock excavation engineers have a variety of explosives to choose from dynamite, water-gel, slurry, emulsion ANFO and Heavy ANFO for rock blasting. The important explosive properties which include velocity of detonation, gap, cap, shock and drop weight sensitivity and strength are normally considered for selection. The resistance of an explosive against impact energy gives an indication of its safety in handling, transportation and usage. While charging explosives in blast holes they mix with drill hole gummings and grits. Due to contamination its impact and frictional sensitivity increase. Impact sensitivity of opencast gelignite (NG based), slurry PETN, ANFO and liquid extrude materials from NG based explosive has been determined by the authors. The impact energy (kpm) at 50 per cent explosion point was compared from fresh PETN, NG based, ANFO, slurry and liquid extrude materials from old NG based explosives. NG based explosive exploded at 0.65 kpm, but on contamination with sand it exploded at 0.40 kpm. Liquid extrude material from NG based explosive exploded at 1.70 kpm and became sensitive when water was evaporated. Slurry explosive was less sensitive to impact even at 10.0 kpm, but on mixing with sand it exploded at 3.5 kpm fall impact energy.

Item Type:	Article
Subjects:	Explosive Research
Divisions:	UNSPECIFIED
Depositing User:	Dr. Satyendra Kumar Singh
Date Deposited:	03 Feb 2012 10:30
Last Modified:	03 Feb 2012 10:30
URI:	http://cimfr.csircentral.net/id/eprint/855

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