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Science and Technology of Energetic Materials

Vol.64, No.5 (2003)

Research paper

Characteristics of ammonia gas generation controlled ANFO explosive and blasting system with ANFO explosive (*in Japanese)
Ko Kawano, Masayuki Suzuki, Masato Shinji, and Koji Nakagawa
p.208-216

Abstract

Ammonia gas produced by ammonium nitrate fuel oil (ANFO) explosive during tunnel excavation was a big issue for making a decision to adopt this ANFO explosive. In order to clarify the issue, we verified the effectiveness of organic acid added ANFO (ANFOOA) explosive developed to control ammonia gas generation, and blasting system with ANFO explosive.
The concentration of ammonia gas generation from ANFOOA explosive decreased to approximately one third to one tenth compared with the usual ANFO explosive. Since the ANFOOA explosive came into the market, ANFO explosive users have increased from 16 sites for 8 years to 43 sites for 4 years. Besides, it has been proved that blasting system with ANFO explosive is able to reduce the number of drilling holes approximately 15% to 20% in comparison with using Gelatin explosives.

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