ABSTRACT
During the different blasting project works in India, the authors collected rebound hardness values of rocks from the various blasting sites using Schmidt hammer. It has been found that the hardness values of rocks could be correlated with explosive charge factors to provide a meaningful relationship for the surface blast design. This could be used for quick and easy assessment of charge factors for bench blasting in an open excavation. This paper describes the assessment of explosive charge factors from rebound hardness values of rock based on the extensive field data collected at different mines and civil engineering project sites.
