ABSTRACT
Katsabanis et al. (2006) made small scale blast tests to investigate the effect of short delays on fragmentation. The tests were performed on a small scale granodiorite block. The drilling pattern composes an equilateral triangular spacing of 102 mm giving a burden of 8.8 cm. The tested delays were 0, 10, 20, 40, 80, 100, 1000, 2000 and 4000 μs. The purpose of the very short delays was to investigate the fragmentation under shock wave interactions. The blocks were free (four free faces) trapping all the produced stress waves within the block body. The findings of these tests were in agreement with previous tests (Stagg & Rholl 1987), indicating the delay time for optimum fragmentation to lay in the range of 3.3-13 ms/m of burden.
