Comparative study on the effect of incorporation of Linz-Donawitz slag as coarse aggregate in concrete reinforced with different fibers

This study aims to evaluate the performance of concrete using Linz-Donawitz (LD) slag as a replacement for natural coarse aggregates (NCA) with different fibers in concrete. Four different types of fibers, namely polypropylene fiber (PPF), glass fiber (GF), basalt fiber (BF), and steel fiber (SF), were added to assess their impact on concrete properties. LD slag, originating as a by-product of the steel manufacturing process, not only offers an environmentally sustainable alternative to NCA but also augments the overall structural performance of concrete. Because of the presence of free lime, the use of LD slag in concrete may lead to volume expansion and cracking in the concrete. However, adding fibers can mitigate this issue by enhancing tensile strength and reducing microcracking. The research findings revealed that adding fibers to LD slag concrete greatly improves its mechanical and durability qualities. Among all, SF demonstrated the greatest effectiveness in enhancing mechanical properties, while BF showed notable improvements in durability. PPF and GF also exhibit promising results, however, to a lesser extent compared to steel and basalt fibers. Overall, the study concludes that the integration of fibers enhances the efficiency of concrete incorporating LD slag, improving both mechanical properties and durability. The research highlights the potential of LD slag as a sustainable and cost-effective alternative to NCA in concrete. Additionally, it emphasizes the benefits of using different fiber types to enhance concrete mixtures. The outcomes of this study provide valuable insights for sustainable and durable construction practices using LD slag concrete with fibers.