Abstract
Abstract Steel slag is a byproduct from steel making industry characterized by variable chemical components and low cementitious properties. This results in insufficient utilization and excessive stockpiling and causes serious environmental hazard. This paper presents a study on the application of steel slag in ultra-high performance concrete (UHPC). The effect on the hydration behavior, microstructure, mechanical and volume properties is analyzed alongside the evaluation on the ecological performance of UHPC mixes containing steel slag. When cement is partially replaced by steel slag in UHPC mixes, the early age hydration is retarded, leading to reduction in the compressive strength. However, the long-term compressive strength is only marginally affected consistent with the almost unaltered pore structure and equally compact matrix microstructure from the backscattered image. Addition of steel slag does not alter the pattern of autogenous shrinkage development whereas the autogenous shrinkage strain is slightly reduced at a higher steel slag content. The leaching toxicity test and the life cycle analysis demonstrates enhanced eco-friendliness of UHPC mixes containing steel slag which is beneficial in extending the utilization of steel slag in UHPC.
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