Enhancing concrete’s ballistic impact resistance using Alfa fiber

Natural fibers are gaining interest in recent years due to the increasing calls for eco-friendly materials production. Concrete reinforcement with Alfa fiber is attracting attention to take benefit of natural fiber advantages in the construction sector. The mechanical and physical characteristics of concrete reinforced with Alfa fibers have been primarily investigated. The current study seeks to analyse the ballistic protection performance of Alfa-reinforced concrete in response to the emerging need to withstand bullet impacts and protect occupants in light of the increasing armed hostilities. Eight formulations were selected for the concrete preparation by varying the Alfa fiber content from 0 to 100 kg/m³. After determining the mechanical characteristics of the concrete such as compressive, flexural and tensile strength, ballistic resistance to bullet impacts is determined by measuring the penetration depth, the crater area and the lost mass after impact in concrete slab 10 and 15 cm thick. The formulations of Alfa-reinforced concrete exhibited lower penetration depth, crater area, and lost mass compared to the reference concrete. Optimal values were achieved with 15 kg/m³ of fibers. A dependency between the ballistic response on the fibrous concrete and flexural strength of concrete is also remarked. In conclusion, the study demonstrates that incorporating Alfa fibers into concrete significantly enhances its ballistic resistance, with optimum performance observed at 15 kg/m³ of fiber inclusion. These findings underscore the potential of Alfa-reinforced concrete for use in military constructions and structures vulnerable to impact risks, paving the way for further research and practical applications in enhancing structural and occupant safety.