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4.2. Conclusion The incorporation of ISFs and EFs into RAC significantly enhances its performance in terms of durability, energy absorption, and crack resistance, making it suitable for critical applications like canal linings, beam-column joints, and rigid pavements. While ISFs offer superior mechanical benefits, EFs provide a sustainable solution that contributes to reducing the environmental impact of construction. The synergistic use of recycled aggregates and waste fibers offers a pathway to more sustainable construction practices, promoting both environmental responsibility and improved structural performance. Further research on hybridizing EFs with industrial fibers could unlock even greater potential for sustainable, high-performance concrete solutions. Acknowledgments The authors express their sincere appreciation to the Department of Concrete Structures and Bridges for their financial support towards the PhD research of the first author and for providing the necessary funding to conduct this research. Furthermore, the authors express their sincere appreciation to Assoc. Prof. Dr. Ing. Peter Paulik for his valuable assistance and for the financial support provided by the Scientific Grant Agency VEGA under contract No. VEGA 1/0358/23, as well as by Interreg CENTRAL EUROPE 2021-2027 CE0100390 – ReBuilt, project APVV-23 0193, and APVV-23-0383. References Anike, E. E., Saidani, M., Ganjian, E., Tyrer, M., & Olubanwo, A. O. (2020). Evaluation of conventional and equivalent mortar volume mix design methods for recycled aggregate concrete. Materials and Structures/Materiaux et Constructions , 53 (1). https://doi.org/10.1617/s11527-020 1457-3 Arabani, M., & Azarhoosh, A. R. (2012). 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