2026-06-04T12:48:10Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/373242026-05-29T12:28:11Zcom_10630_2254col_10630_37953

00925njm 22002777a 4500 dc Pérez-Bravo, Raquel author Koufany, Imane author Cuesta-García, Ana María author Bescher, Eric P. author García-Aranda, Miguel Ángel author Santacruz-Cruz, María Isabel author Gómez-de-la-Torre, María de los Ángeles author 2025 The hydration behavior of belite phase in different cements is not well understood. Belite hydrates very slowly but there are reports with faster hydration kinetics. Here, the hydration behavior of belite phase in a commercial belite calcium sulfoalumi- nate (BCSA) cement has been investigated. The BCSA cement was hydrated with two water-to-cement ratios, 0.50 and 0.65 and at two temperatures, 20 and 40 °C. Studies of calorimetry, NMR, laboratory X-ray powder diffraction (XRPD), thermal analysis (TA) of the pastes, and mass balance calculations have been performed. The calorimetric and LXRPD studies showed that with sufficient water for the hydration reactions to take place, i.e., w/c = 0.65, the degree of reaction of belite is 30% at 7 days and above 60% at 35 days, at 40 °C. The 29 Si and 27 Al MAS-NMR and TA studies confirmed the reactivity of belite under conditions of sufficient water (thermodynamic requirement) and at high temperature (kinetic requirement). This was demonstrated by the presence of stratlingite by 27 Al MAS-NMR and TA. Finally, it was found that ~ 12 mass% of the added water remains unbound, but it is unavailable for the progression of hydration reactions in the studied experimental conditions. R. Pérez-Bravo, I. Koufany, A. Cuesta, E.P. Bescher, M.A.G. Aranda, I. Santacruz, A.G. De la Torre, Reactivity of belite in calcium sulfoaluminate-based cements, Journal of Thermal Analysis and Calorimetry 2025 (2025) 1–12. https://doi.org/10.1007/S10973-024-13933-8. https://hdl.handle.net/10630/37324 10.1007/s10973-024-13933-8 Cemento Reactivity of belite in calcium sulfoaluminate‑based cements