ABSTRACT
A b s t r a c t The M i n i s t r y of I n t e r n a t i o n a l T r a d e and I n d u s t r y of J a p a n h a s f o r e s e e n t h e i n c r e a s i n g demand of b l a s t i n g method c a p a b l e of d e m o l i s h i n g u r b a n c o n c r e t e s t r u c t u r e s e f f i c i e n t l y , and n e c e s s a r y t a s k s t o s e t t h e s e c u r i t y c r i t e r i a in t h e u s e of e x p l o s i v e s we re t h e n e n t r u s t e d t o Al l J a p a n A s s o c i a t i o n f o r S e c u r i t y of E x p l o s i v e s in 1 9 8 7 .
