2026-05-30T08:07:55Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/256122026-02-03T11:16:36Zcom_10630_2254col_10630_37953

On the early hydration of cubic ye’elimite: New insights from time-resolved in situ MAS NMR spectroscopy Paul, Geo Cuesta-García, Ana María Boccaleri, Enrico Cassino, Claudio Marchese, Leonardo Hidratación Two polymorphs of ye’elimite are known to exist in calcium sulfoaluminate cements, namely, orthorhombic (iron free), C4A3$ and cubic/pseudo-cubic (iron incorporated), C4A3-xFx$ forms. The very early hydration behaviour of cubic ye’elimite (nominal composition: Ca3.8Na0.2Al5.6Fe0.2Si0.2O12SO4) has been investigated using a time-resolved in situ multi-nuclear (1H, 27Al, 23Na and 29Si) MAS NMR spectroscopic approach. The study shows that the reaction pathway and the intermediate species formed are substantially different from those that are observed during the hydration of orthorhombic ye’elimite, and the rate as well as the nature of hydration products are dictated by the presence or the absence of limestone (CaCO3). Furthermore, the detection of diverse transient species as well as the uncovering of different kinetic behaviour during the early hydration of cubic ye’elimite illustrate the advantages of time-resolved in situ MAS NMR experimental approach for fingerprinting hydrated phases. 2022-12-12T11:07:06Z 2022-12-12T11:07:06Z 2022-12-02 journal article Materials Letters 333 (2023) 133630 https://hdl.handle.net/10630/25612 10.1016/j.matlet.2022.133630 spa http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier