Effect of clinkering conditions on phase evolution and microstructure of Belite Calcium-Sulpho-Aluminate cement clinker

This paper studies the effect of clinkering temperature and duration on the production, phase evolution and microstructure of low energy Belite Calcium-Sulpho-Aluminate (BCSA) clinkers. The mineralogy and microstructure of BCSA clinker, produced in the temperature range of 1270–1340 °C and clinkerin...

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Bibliographic Details
Published in:Cement and concrete research 2021-09, Vol.147, p.106529, Article 106529
Main Authors: Koumpouri, D., Karatasios, I., Psycharis, V., Giannakopoulos, I.G., Katsiotis, M.S., Kilikoglou, V.
Format: Article
Language:English
Subjects:
Bauxite
Belite Calcium-Sulpho-Aluminate or Belite-Ye'elimite-Ferrite
Belite polymorphism
Calcium
Clinker
Clinkering conditions
Dicalcium silicate
Evolution
Green cement clinker
High temperature
Microstructure
Mineralogy
Orthorhombic phase
Perovskites
Polymorphism
Stabilization
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Summary:This paper studies the effect of clinkering temperature and duration on the production, phase evolution and microstructure of low energy Belite Calcium-Sulpho-Aluminate (BCSA) clinkers. The mineralogy and microstructure of BCSA clinker, produced in the temperature range of 1270–1340 °C and clinkering duration periods of 20, 30 and 60 min, were studied by XRD/QXRD and SEM/EDS. In all clinkering conditions belite was detected in both αH′- and β-polymorphs while ye'elimite was mainly formed in the orthorhombic phase, accompanied by small amounts of cubic polymorph. Extensive formation of perovskite was also detected. It was shown that elevated concentrations of Ti and S affect belite's polymorphism; at low clinkering conditions their incorporation in the belite crystal led to the stabilization of αH′-polymorph, while at elevated temperatures their partial release from belite crystals favours the stabilization of β-polymorph. The results highlight the importance of experimental simulation in combination with theoretical clinker design. •Microstructure of belite and ye'elimite studied by scanning electron microscopy•Relative concentration of belite and ye'elimite as a function of clinkering temperature and duration•Effect of raw mix composition and clinkering conditions on belite polymorphism, in Belite Calcium-Sulpho-Aluminate clinker•Quantitative analysis of clinkering phases in Belite Calcium-Sulpho-Aluminate clinker
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2021.106529