The structural integrity of reinforced concrete structures (RC) protecting impotant infrastructure against external hazards is indispensable. If the protective structure is damaged by an impact event, such as crash or airplane impact, the question arises to which degree the reinforced concrete shielding still has its protective capability. This concerns both purely structural protection and protection against liquids penetrating the shielding. Due to the dimensions of the protective structures, it is usually difficult to perform real scale impact experiments, so in the past decades specimen with smaller geometries at medium scale have been used for investigations. Detailed investigations on the structural behaviour of RC members or RC plates subjected to impact loading have already been presented in Hering et al. [1] and Nerger et al. [2].
The investigation deals with the single and multiple impact events (first hard impact and/or subsequent soft impact) on a RC specimen. A description of the test setup and the test procedure as well as a presentation of the test results from impact tests will be provided. The penetration failure (spalling) of cube shaped specimen will be discussed in detailed, based on the impact energy reached in both impact events. In addition, the damaged specimens are to be examined by planar tomography to obtain the damage inside the specimen. The combination of detailed damage review and planar tomography investigation should enable a comprehensive understanding of the damage to the RC specimen.
Furthermore, the experimental program is presented, in which the damaged RC specimens are to undergo a test to investigate the key question of how much liquid media, such as water and kerosene, passes through the damaged and cracked RC structure.