Air Quenching of Steel Slag to Enhance its Hydraulic Activity for Recycling the Slag as Materials in Cement and Concrete Applications

Peng Xue; Qi Xing Yang; Gui Qun Liu; Feng Lan Han; Liang Jiang; Fredrik Engström; Bo Björkman

doi:10.4028/www.scientific.net/KEM.737.488

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 737Air Quenching of Steel Slag to Enhance its...

Air Quenching of Steel Slag to Enhance its Hydraulic Activity for Recycling the Slag as Materials in Cement and Concrete Applications

Abstract:

A steel slag has been treated by air granulation, in order to enhance cementitious properties of the slag. Two samples with sizes ranged 1.68-2.38mm and 212-297μm and coded as Slag A and Slag B, respectively, were chosen from the granulated slag for investigations. A sample of the original steel slag was also studied. XRD analyses indicated the formations of α-C₂S, β-C₂S, C₂F, C₂MS₂, f-MgO and α-C₂S, C₂F, f-MgO in Slag A and Slag B, respectively. The phases in the two slag samples were quite different from the phases found in steel slag. The SEM results show a reduction of C₂S sizes from 10-20μm for the steel slag to nano-scales by air quenching for Slag B. This treatment of air quenching has increased the cumulative heat of hydration to 105.35J/g measured for Slag B, almost two times greater than that of the steel slag. The study results demonstrate a high potential for utilizations of the steel slag in cement and concrete applications after the slag treatment by air quenching. The treatment may thus lead to an environmental friendly and cost-effective recycling for the steel slag. This can also contribute to the sustainable developments in the steel and cement/concrete industries.

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Periodical:

Key Engineering Materials (Volume 737)

Pages:

488-493

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.737.488

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Online since:

June 2017

Authors:

Peng Xue, Qi Xing Yang*, Gui Qun Liu, Feng Lan Han, Liang Jiang, Fredrik Engström, Bo Björkman

Keywords:

Air Quenching, C₂S, Cement, Granules, Hydration, Steel Slag

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