Análise de impactos balísticos em corpos de prova de concreto: caracterização do material e identificação, análise e classificação dos danos

Abstract

Statistics published by the Institute of Public Security have been driving the increasing search for construction methods that enhance the sense of security, marking recent years with a significant growth in investments in shielding systems. Concrete, in turn, proves to be an important instrument for the development of products for this purpose and presents promising results when subjected to ballistic impacts. This study presents the performance of concrete samples with an average compressive strength of 40 MPa, which were subjected to ballistic impacts caused by projectiles of nominal calibers 0.40" and 5.56 mm. To conduct the experiment, concrete specimens in both cylindrical and prismatic shapes were manufactured. The cylindrical specimens underwent compression tests using a Solotest press, while the prismatic ones were subjected to ballistic impact tests fired from a distance of fifteen meters. The tests revealed the occurrence of local damage, such as the formation of craters and tunnels, without significant global damage being identified. These results highlight the ability of concrete, with a compressive strength of 40 MPa, to withstand impacts caused by 5.56 mm and 0.40" caliber projectiles, even without the application of additional reinforcements.