Effect of rich-MgO from low-calcium limestone on the calcination and properties of C₄A₃$-C₂S clinker

Abstract

As one type of low-calcium cement, C₄A₃$-C₂S clinker consumes less energy and can utilize rich-MgO low-calcium limestone. The effect of rich-MgO low-calcium limestone on its calcination and properties is studied by means of f-CaO, XRD Rietveld refinement, TG-DTG and Lithofacies analysis. The results show that 3%∼5% MgO can promote the absorption of f-CaO and accelerate the formation of highly active monoclinic C₃S and C₄AF in clinker. When the MgO content is 7% and 8%, C₄A₃$-C₂S clinker calcined at 1380°C has excellent mechanical properties and its soundness is still qualified. This research shows that the rich-MgO low-calcium limestone can replace more than 50% of natural limestone to prepare C₄A₃$-C₂S clinker in cement industrial production.

Keywords

MgO / C₄A₃$-C₂S clinker / Early hydration / Compressive strength

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Data availability

No data was used for the research described in the article.

CRediT authorship contribution statement

Yiping Qiu: Writing - original draft, Methodology, Investigation, Formal analysis, Data curation, Conceptualization. Chengming Li: Methodology, Data curation. Yiqun Zhang: Methodology, Data curation. Yuan Feng: Methodology, Data curation. Sergei Leonovich: Methodology, Data curation. Piqi Zhao: Writing - review & editing, Supervision, Methodology, Conceptualization. Shoude Wang: Writing - review & editing, Supervision, Conceptualization.

Acknowledgements

This work was supported by National Key Research and Development Program of China (No. 2021YFB3802002 and 2023YFE0126000), Natural Science Foundation of China (52072149 and 51672108).

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