MARROK, SaraBelachia , Mouloud2025-10-092025-10-092025-07-07http://dspace.univ-skikda.dz:4000/handle/123456789/5153Industrial waste is one of the most significant environmental challenges facing the world today, contributing substantially to environmental pollution. To mitigate these negative impacts, recycling industrial waste and utilizing it in various fields, such as civil engineering, has become an essential option to achieve environmental sustainability. These wastes can be employed as cost-effective alternative materials to enhance the properties of concrete and reduce its overall cost. Recycled industrial fibers play a dual role in improving concrete performance while minimizing the environmental impact of industrial waste. These materials also contribute to lowering the cost of concrete, making them a viable option for use in complex engineering structures. In this study, High-Flow Sand Concrete (HFSC) was selected due to its lower cost compared to conventional concrete, its fine internal structure free from coarse aggregates, and its distinctive physical properties. Three types of industrial fibers were added, each with specific characteristics: stainless steel shavings (316L-SSF) as macro fibers, bronze shavings (UE7- BF) as micro fibers, and wasted polyester fibers (WPF) as macro synthetic fibers. After evaluating the initial performance of each fiber type individually, they were combined into hybrid systems (dual and triple fibers) to analyze their effects on the physical, mechanical, chemical, and physio-chemical properties of the concrete. Fiber proportions at 0.25% , 0.50%, 1.00%, 1.50%, and 2.00% were used to ensure diverse results and determine the optimal ratios. Microscopic analysis (SEM) confirmed that the fibers improved the matrix cohesion of the concrete and reduced pore size, which contributed to enhancing its overall performance. These findings indicate that industrial fibers, whether mono or hybrid, represent a sustainable and efficient solution for improving the quality of High-Flow Sand Concrete, with broad potential applications in complex engineering construction projectsenconcretes reinforcedhybrid fibersThesis