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<p>The present paper deals with use of Blast Furnace Slag (BFS), a sustainable and recycled by-product from steel manufacturing unit. The cement can be partially substituted with BFS for making it eco-friendly and sustainable in preparation of concrete (M25 and M30). It is a novel material, which is less explored and not at all used in any construction activities. The demand for new and alternative material with eco-friendly and sustainable material is the need of the hour. This research deals with partial replacement of cement from 0 to 60% with 10% increment in each mix for M25 and M30 grade of concrete. The physical, mechanical and morphological properties of concrete are carried out. The density of concrete for M25 and M30 grade of concrete stayed fairly consistent, showing that the overall density wasn’t affected. The workability (Slump cone test) of concrete is linearly reduced which became easier to work with, likely due to the smooth, glass-like particles in the slag that help it flow better. The compressive strength for both M25 and M30 concrete showed a positive growth till 30% replacement of BFS and then it reduced, the strength reaching 37&#xa0;MPa for M25 and 42&#xa0;MPa for M30 at 28&#xa0;days. The main reason to improve the compressive strength is because of more compact and well-formed internal structure, which helps improve durability, was interpreted with microscopic analysis (Scanning Electron Microscopic (SEM)). The Energy-Dispersive X-ray Spectroscopy (EDX) confirmed the presence of reactive materials that support strength development. The chemical bonds which are strong and weak are predicted with FTIR analysis showed a strong peak that suggests the slag contains useful silicate compounds. Overall, replacing up to 30% of cement with BFS can make concrete stronger, more workable, and environmentally friendly.</p>

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A multi-scale study on the use of blast furnace slag in cementitious concrete: from slump to SEM

  • 期刊论文

  • 发表日期：

    2025年11月26日

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  • Snehal R. Metkar,
  • Abhinandan R. Gupta

摘要

The present paper deals with use of Blast Furnace Slag (BFS), a sustainable and recycled by-product from steel manufacturing unit. The cement can be partially substituted with BFS for making it eco-friendly and sustainable in preparation of concrete (M25 and M30). It is a novel material, which is less explored and not at all used in any construction activities. The demand for new and alternative material with eco-friendly and sustainable material is the need of the hour. This research deals with partial replacement of cement from 0 to 60% with 10% increment in each mix for M25 and M30 grade of concrete. The physical, mechanical and morphological properties of concrete are carried out. The density of concrete for M25 and M30 grade of concrete stayed fairly consistent, showing that the overall density wasn’t affected. The workability (Slump cone test) of concrete is linearly reduced which became easier to work with, likely due to the smooth, glass-like particles in the slag that help it flow better. The compressive strength for both M25 and M30 concrete showed a positive growth till 30% replacement of BFS and then it reduced, the strength reaching 37 MPa for M25 and 42 MPa for M30 at 28 days. The main reason to improve the compressive strength is because of more compact and well-formed internal structure, which helps improve durability, was interpreted with microscopic analysis (Scanning Electron Microscopic (SEM)). The Energy-Dispersive X-ray Spectroscopy (EDX) confirmed the presence of reactive materials that support strength development. The chemical bonds which are strong and weak are predicted with FTIR analysis showed a strong peak that suggests the slag contains useful silicate compounds. Overall, replacing up to 30% of cement with BFS can make concrete stronger, more workable, and environmentally friendly.