2026-05-30T23:14:57Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/245362026-02-03T11:17:36Zcom_10630_2254col_10630_37953

Hydration and interactions between pure and doped C3S and C3A in the presence of different calcium sulfates Neto, José da Silva Andrade De Matos, Paulo R. Gómez-de-la-Torre, María de los Ángeles Campos, Carlos E. M. Torres, Sandro M. Monteiro, Paulo J. M. Kirchheim, Ana Paula Yeso (Material) This research studied the hydration of C3S-C3A-calcium sulfate systems made of combinations of two C3S (pure triclinic and Al-doped monoclinic), two C3A (pure cubic C3A and Na-doped orthorhombic), and two calcium sulfates (gypsum and hemihydrate). For each system, the hydration of four different SO3 contents (0.25–2.0 wt%) was assessed by calorimetry. The optimum SO3 content was fixed from calorimetry results, and the mixtures were evaluated by in-situ XRD and TGA. The type of C3S was the factor that most affected the sulfate balance of the systems. The mixes with Al-C3S produced a higher amount of ettringite in the first hours, resulting in much earlier sulfate depletions when compared to the mixes with pure C3S. The mixes with ort-C3A also showed faster sulfate depletion due to its higher reactivity compared with cb-C3A. Finally, the replacement of gypsum by hemihydrate resulted in faster sulfate depletion caused by the faster hemihydrate dissolution 2022-07-04T10:04:40Z 2022-07-04T10:04:40Z 2022 2022 journal article Cement and Concrete Research, Volume 159, 2022, 106893 https://hdl.handle.net/10630/24536 10.1016/j.cemconres.2022.106893 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional