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Mechanochemical Activation of Basic Oxygen Furnace Slag: Insights into Particle Modification, Hydration Behavior, and Microstructural Development
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Mechanochemical Activation of Basic Oxygen Furnace Slag: Insights into Particle Modification, Hydration Behavior, and Microstructural Development
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Journal Article
Mechanochemical Activation of Basic Oxygen Furnace Slag: Insights into Particle Modification, Hydration Behavior, and Microstructural Development
2025
Overview
This study proposed a mechanochemical activation strategy using ethanol-diisopropanolamine (EDIPA) to improve the grindability and hydration reactivity of basic oxygen furnace slag (BOFS), aiming for its large-scale industrial utilization. The incorporation of EDIPA significantly refined the particle size distribution and reduced the repose angle. As a result, the compressive strength of BOFS paste increased by 25.4 MPa at 28 d with only 0.08 wt.% EDIPA. Conductivity tests demonstrated that EDIPA strongly complexes with Ca2+, Al3+, and Fe3+, facilitating the dissolution of active mineral phases, such as C12A7 and C2F, and accelerating hydration reactions. XRD and TG analyses confirmed that the incorporation of EDIPA facilitated the formation of Mc (C4(A,F)ČH11) and increased the content of C-S-H, both of which contributed to microstructural densification. Microstructural observations further revealed that EDIPA refined Ca(OH)2 crystals, increasing their specific surface area from 4.7 m2/g to 35.2 m2/g. The combined effect of crystal refinement and enhanced hydration product formation resulted in reduced porosity and improved mechanical properties. Overall, the results demonstrated that EDIPA provided an economical, effective, and scalable means of activating BOFS, thereby promoting its high-value utilization in low-carbon construction materials.
