Crushing method utilizing thermite reaction has been known in Japan. This system is not defined as explosives in the Japanese Explosives Control Law, so it is used as non-explosives. Now, Kayaku Japan Co., Ltd. manufactures and sells utilizing thermite reaction agent ���ROCKRACK®���. USA DDT test was experimented. As a result, ROCKRACK® was not detonated. In this time, ROCKRACK® was used for two patterns sinking crush, and we confirmed satisfactory crush. From these crush tests, it was found that diameter of crushed stone of ROCKRACK® was larger than that of explosives, and ROCKRACK® could be used in deck charge under appropriate conditions.
non-explosive, ROCKRACK®, thermite reaction, bedrock, fragmentation