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Article

Effect of the Cooling Regime on the Mineralogy and Reactivity of Belite-Sulfoaluminate Clinkers

1
Slovenian National Building and Civil Engineering Institute, Dimičeva ulica 12, 1000 Ljubljana, Slovenia
2
Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
3
Salonit Anhovo Joint-Stock Co, Anhovo 1, 5210 Deskle, Slovenia
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(10), 910; https://doi.org/10.3390/min10100910
Received: 4 September 2020 / Revised: 10 October 2020 / Accepted: 12 October 2020 / Published: 15 October 2020
(This article belongs to the Special Issue Minerals and Other Phases in Constructional Geomaterials)
This study investigated the influence of different cooling regimes on the microstructure and consequent reactivity of belite-sulfoaluminate clinkers. The cement clinkers were synthesized by incorporating secondary raw materials, such as titanogypsum and bottom ash, to the natural raw materials. Clinker phases were determined by Rietveld quantitative phase analysis, while the distribution morphology and the incorporation of substitute ions in the phases were characterized by scanning electron microscopy using energy-dispersive X-ray spectroscopy (SEM/EDS). Clinker reactivity was studied using isothermal calorimetry and was additionally investigated through compressive strength, which was determined for the cement prepared from the synthesized clinkers. X-ray diffraction analysis showed that, as well as the three main phases (belite, calcium sulfoaluminate, and ferrite), the clinkers contained additional minor phases (mayenite, gehlenite, arkanite, periclase, and perovskite), the ratios of which varied according to the cooling regime utilized. Microscopic observations indicated that the cooling regime also influenced the crystal size and morphology of the main phases, which consequently affected clinker reactivity. Furthermore, a smaller amount of substitute elements was incorporated in the main phases when cooling was slowed. Results showed that, in comparison to clinkers cooled at slower rates, air quenched clinkers reacted faster and exhibited a higher compressive strength at 7 days. View Full-Text
Keywords: clinkers; belite; calcium sulfoaluminate; cooling; microstructure; reactivity clinkers; belite; calcium sulfoaluminate; cooling; microstructure; reactivity
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MDPI and ACS Style

Dolenec, S.; Šter, K.; Borštnar, M.; Nagode, K.; Ipavec, A.; Žibret, L. Effect of the Cooling Regime on the Mineralogy and Reactivity of Belite-Sulfoaluminate Clinkers. Minerals 2020, 10, 910. https://doi.org/10.3390/min10100910

AMA Style

Dolenec S, Šter K, Borštnar M, Nagode K, Ipavec A, Žibret L. Effect of the Cooling Regime on the Mineralogy and Reactivity of Belite-Sulfoaluminate Clinkers. Minerals. 2020; 10(10):910. https://doi.org/10.3390/min10100910

Chicago/Turabian Style

Dolenec, Sabina, Katarina Šter, Maruša Borštnar, Klara Nagode, Andrej Ipavec, and Lea Žibret. 2020. "Effect of the Cooling Regime on the Mineralogy and Reactivity of Belite-Sulfoaluminate Clinkers" Minerals 10, no. 10: 910. https://doi.org/10.3390/min10100910

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