This paper presents the results of an experimental study aim at enhancing the understanding of some characteristics of an interior explosion within a confined underground area on specimen used, as well as the effect of the explosive charge size on the pressure distribution along the compacted specimen which is placed in the apparatus. The study involved blast test which provides a measured pressure based on the amount of explosive used. The type of explosive used for this experiment is Emulex with detonation velocity range from 4500m/s to 5400m/s. The microstructure of specimen A and B is analyzed using Scanning Electron Microscope (SEM). Then, the hardness of both specimens is tested using Rockwell Digital Hardness and the result for specimen A is 33.8HRA, while for specimen B is 43.7HRA. Besides that, the bending strength of specimen A and B had been tested using Calcium Carbide Explosive Shape charge and the force that applied to the specimen B during the bending strength is 243,160.68kN, while for specimen A, there is no effect of bending strength test.
