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The β-γ polymorphic transition of calcium orthosilicate (C 2 S) 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 C 2 S 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 (C 12 A 7 ) in calcium orthosilicate (C 2 S) affects the temperature at which the polymorphic transi-tions from α’L-C 2 S to β-C 2 S and from β-C 2 S to γ-C 2 S undergo stabilization. The applied techniques included differential thermal analysis (DTA), calorimetry and X-ray diffraction (XRD), and they made it possible to determine what C 2 S/C 12 A 7  phase ratio in the samples and what cooling rate constitute the optimal conditions of the self-disintegration process. The optimal cooling rate for C 2 S materials with a C 12 A 7  content of up to 60 wt% was determined to be 5 K·min −1 . The optimal mass ratio of C 2 S/C 12 A 7  was found to be 70/30, which ensures both efficient self-disintegration and desirable grain size distribution.

Physicochemical Study of the Self-Disintegration of Calcium Orthosilicate (β→γ) in the Presence of the C12A7 Aluminate Phase