The aim of this study is to develop concrete composites that are resistant to armor-piercing projectiles for defense structures. Different reinforcement configurations have been tested, such as short steel fibers, long steel fibers, and steel mesh reinforcement. Three different concrete mix designs were prepared as “Ultra High Performance (UHPFRC), High Performance (HPFRC) and Conventional (CFRC) Fiber Reinforced Concrete”. The content of hybrid steel fibers was approximately 5% in the UHPFRC and HPFRC mixtures, while the steel fiber content was approximately 2.5% in the CFRC mixture. In addition, a plain state of each mixture was produced. Mechanical properties of concrete were determined in experimental studies. In addition to the fracture energy and impact strength, two important indicators of ballistic performance of concrete are examined, which are the penetration depth and damage area. The results of the study show that the depth of penetration in UHPFRC was around 35% less than that in HPFRC. It was determined that the mixtures of UHPFRC and HPFRC containing 5% by volume of hybrid steel fibers showed superior performance (smaller crater diameter and the less projectile penetration depth) against armor-piercing projectiles in ballistic tests and could be used in defense structures.

本研究的目的是开发能够抵抗用于防御结构的穿甲弹的混凝土复合材料。已经测试了不同的增强配置，例如短钢纤维、长钢纤维和钢网增强。三种不同的混凝土配合比设计被准备为“超高性能 (UHPFRC)、高性能 (HPFRC) 和常规 (CFRC) 纤维增强混凝土”。UHPFRC 和 HPFRC 混合物中混合钢纤维的含量约为 5%，而 CFRC 混合物中钢纤维的含量约为 2.5%。此外，产生了每种混合物的普通状态。混凝土的力学性能在实验研究中确定。除了断裂能和冲击强度外，还检查了混凝土的两个重要防弹性能指标，分别是穿透深度和损伤面积。研究结果表明，UHPFRC 中的穿透深度比 HPFRC 中的低 35% 左右。经测定，UHPFRC 和含有 5%（体积）混合钢纤维的 HPFRC 混合物在弹道测试中对穿甲弹表现出优异的性能（弹坑直径更小，弹丸穿透深度更小），可用于防御结构。