Utilization of steel slag in concrete: A review on durability and microstructure analysis

Abstract

This study addresses the research gap in understanding the durability aspects and microstructure properties of steel slag (SS) concrete. A series of different experimental results, including porosity, water absorption, pulse velocity, carbonation depth, chloride penetration, alkali–silica reaction, acid attacks, and shrinkage, were summarized to assess the durability of SS concrete. Similarly, the pozzolanic reaction of SS, the heat of hydration, scanning electronic microscopy, and thermogravimetry were used to assess the microstructure properties of SS-based concrete. Results indicate that the SS improved the durability aspects and microstructure properties of SS concrete. However, inconsistencies in slag quality, reactivity, and expansion risks due to free lime and magnesium oxide present challenges. Finally, the review also highlights the proposed recommendation for future research.

Keywords

• steel slag
• sustainability
• concrete
• workability
• compressive strength
• acid attacks
• and alkali–silica reaction