2026-05-30T03:33:14Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/234412026-02-03T11:23:41Zcom_10630_2254col_10630_37953

Hydration of C3S and Al-doped C3S in the presence of gypsum Neto, José da Silva Andrade Rodríguez, Erick D. Monteiro, Paulo J. M. Gómez-de-la-Torre, María de los Ángeles Kirchheim, Ana Paula Cemento Sulfatos Yeso A complete understanding of the effect of gypsum on the C3S hydration and the role of aluminum has not been achieved. The effects of gypsum (at 2.5 wt% and 5.0 wt%) on the hydration of tricalcium silicate (C3S) and aluminum-doped C3S (Al-C3S) hydration are assessed. Isothermal calorimetry, thermodynamic modeling, XRD, TGA, and 27Al and 29Si MAS-NMR were performed to analyze gypsum's influence on the hydration of C3S and Al- C3S. The inclusion of gypsum retarded the initial hydration (first 3 h) for both C3S and Al-C3S due to the interaction between the sulfate ions and C3S. In contrast, gypsum enhanced the hydration of both C3S and Al-C3S afterward. The removal of Al3+ ions of the pore solution by the formation of ettringite is not the mechanism behind the enhancement of C3S hydration by gypsum, which mainly results from changes in C-S-H morphology and increases in the ionic strength. 2021-12-16T11:51:55Z 2021-12-16T11:51:55Z 2022 journal article Cement and Concrete Research 152 (2022) 106686 https://hdl.handle.net/10630/23441 10.1016/j.cemconres.2021.106686 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier