Gesoglu Mehmet, Muhyaddin Guler Fakhraddin, Yardim Yavuz, Corradi Marco
Independent Researcher, Gaziantep 27440, Türkiye.
Construction and Materials Technology Department, Erbil Polytechnic University, Erbil 44001, Iraq.
Materials (Basel). 2025 Jun 9;18(12):2715. doi: 10.3390/ma18122715.
Ultra-high-performance concrete (UHPC) is a material with high mechanical properties that requires the use of fibers to overcome its brittleness, but the use of only one type of fiber may not improve UHPC performance enough. This study investigates the hybrid use of steel and glass fibers to achieve ultra-high strength along with improved ductility and impact resistance. A total of 22 concrete samples, including both plain (unreinforced) and fiber-reinforced types, were produced using micro straight-steel fibers, hooked steel fibers, and micro glass fibers, either individually or in combination. The mechanical properties, ductility, and impact behavior of the concrete samples were evaluated through experimental testing. The inclusion of microfibers had little impact on the compressive strength of concrete, which remained in the range of 130-150 MPa. However, it significantly enhanced the tensile strength, as evidenced by a flexural strength increase of up to 163% compared to the control concrete without microfibers. Numerical simulations were carried out to complement and validate the experimental investigation of projectile penetration. The depth of projectile penetration (DOP) test results were compared with existing empirical models from the literature. The incorporation of hooked steel fibers in hybrid blends significantly improved ductility and enhanced penetration resistance. In addition, previously proposed models from the literature were found to be highly conservative in predicting DOP at high projectile velocities.
超高性能混凝土（UHPC）是一种具有高力学性能的材料，需要使用纤维来克服其脆性，但仅使用一种类型的纤维可能不足以充分提高UHPC的性能。本研究探讨了钢纤维和玻璃纤维的混合使用，以实现超高强度以及改善延性和抗冲击性。总共制作了22个混凝土样本，包括素混凝土（无筋）和纤维增强型，使用了微直钢纤维、带钩钢纤维和微玻璃纤维，单独使用或组合使用。通过实验测试评估了混凝土样本的力学性能、延性和冲击行为。微纤维的加入对混凝土的抗压强度影响不大，抗压强度保持在130 - 150MPa范围内。然而，它显著提高了抗拉强度，与无微纤维的对照混凝土相比，抗弯强度提高了高达163%。进行了数值模拟以补充和验证弹丸侵彻的实验研究。将弹丸侵彻深度（DOP）测试结果与文献中现有的经验模型进行了比较。在混合配方中加入带钩钢纤维显著改善了延性并增强了抗侵彻性。此外，发现文献中先前提出的模型在预测高弹丸速度下的DOP时非常保守。
