• Self-Disintegration of Calcium Orthosilicate (β→γ)
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  • Release time: 2021-12-27
  • calcium orthosilicate
  • self-disintegration
  • polymorphic transformation
Video Introduction

The β-γ polymorphic transition of calcium orthosilicate (C2S) is a key phenomenon in cement chemistry. During this transition, the compound expands due to structural changes and a significant reduction in its density is observed, leading to its disintegration into a powder with a very high specific surface area. Owing to this tendency of the C2S material to “self-disintegrate”, its production is energy-efficient and thus environmentally friendly. A physicochemical study of the self-disintegration process was conducted with the aim of determining how the amount of dodecacalcium hepta-aluminate (C12A7) in calcium orthosilicate (C2S) affects the temperature at which the polymorphic transi-tions from α’L-C2S to β-C2S and from β-C2S to γ-C2S undergo stabilization. The applied techniques included differential thermal analysis (DTA), calorimetry and X-ray diffraction (XRD), and they made it possible to determine what C2S/C12A7 phase ratio in the samples and what cooling rate constitute the optimal conditions of the self-disintegration process. The optimal cooling rate for C2S materials with a C12A7 content of up to 60 wt% was determined to be 5 K·min−1. The optimal mass ratio of C2S/C12A7 was found to be 70/30, which ensures both efficient self-disintegration and desirable grain size distribution.

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Pyzalski, M.; Dąbek, J.; Adamczyk, A.; Brylewski, T. Self-Disintegration of Calcium Orthosilicate (β→γ). Encyclopedia. Available online: https://encyclopedia.pub/video/video_detail/156 (accessed on 29 June 2022).
Pyzalski M, Dąbek J, Adamczyk A, Brylewski T. Self-Disintegration of Calcium Orthosilicate (β→γ). Encyclopedia. Available at: https://encyclopedia.pub/video/video_detail/156. Accessed June 29, 2022.
Pyzalski, Michał, Jarosław Dąbek, Anna Adamczyk, Tomasz Brylewski. "Self-Disintegration of Calcium Orthosilicate (β→γ)," Encyclopedia, https://encyclopedia.pub/video/video_detail/156 (accessed June 29, 2022).
Pyzalski, M., Dąbek, J., Adamczyk, A., & Brylewski, T. (2021, December 27). Self-Disintegration of Calcium Orthosilicate (β→γ). In Encyclopedia. https://encyclopedia.pub/video/video_detail/156
Pyzalski, Michał, et al. ''Self-Disintegration of Calcium Orthosilicate (β→γ).'' Encyclopedia. Web. 27 December, 2021.