Paper Contents
Abstract
The present study investigates the utilization of industrial steel slag as a partial replacement for fine aggregates in concrete, combined with polypropylene (PP) fibers to improve mechanical performance and waterproofing properties. Industrial steel slag, being a by-product of steel manufacturing, poses environmental disposal challenges; however, its latent hydraulic reactivity and high density make it suitable for sustainable concrete production. The experimental program assessed compressive strength, splitting tensile strength, flexural strength, and water absorption at 7, 14, and 28 days. A series of mixes incorporating 0%, 10%, and 20% slag with varying fiber content (0.25% and 0.50%) were designed and tested. Results revealed that slag densified the matrix through secondary CSH gel formation, while fibers improved crack resistance and toughness. The optimized mix of 20% slag with 0.50% fiber demonstrated enhanced compressive strength (56.8 MPa), tensile strength (4.4 MPa), and reduced water absorption (1.42%) at 28 days compared to control specimens. Beyond mechanical improvements, the study highlights the potential of slag-fiber synergy to reduce concrete porosity, thereby producing waterproof, durable, and eco-friendly concrete. This research contributes to sustainable construction by valorizing steel industry waste and minimizing the long-term deterioration of concrete structures due to water ingress.
Copyright
Copyright © 2025 SHUBHAM RAI. This is an open access article distributed under the Creative Commons Attribution License.
