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Título

In-situ reaction of the very early hydration of C3A-gypsum-sucrose system by Micro-Raman spectroscopy

AutorMartínez-Ramírez, S. ; Gutierrez-Contreras, R. ; Husillos Rodriguez, N.; Fernández-Carrasco, Lucía
Palabras claveAdmixture
ESEM/EDS
Sucrose
Ca3Al2O6
Micro-Raman
Hydration
Fecha de publicación4-ago-2016
EditorPergamon Press
CitaciónCement and Concrete Composites 73: 251- 256 (2016)
ResumenThis paper studied in situ, by Micro-Raman spectroscopy, the very early hydration of CA in the presence and absence of sulphates and with sucrose as an additive. For CA hydration in the absence of gypsum, when carbonation is not avoided, carbonate-AFm phases are formed, but in the presence of gypsum, hydroxi-AFm are the main phases. Ettringite is the AFm stable phase developed initially at 70 min of hydration with gypsum and no monosulphate is formed. In the presence of sucrose, this salt, instead of sulphate, is adsorbed over the surface of the CA, avoiding its reaction with sulphates until sucrose desorption. Three hours are necessary to lead to ettringite formation. A nucleation poisoning/adsorption surface mechanism is proposed for added sucrose systems. © 2016 Elsevier Ltd. All rights reserved.
Descripción6 págs.; 7 figs.; 3 tabs.; 1 app.
Versión del editorhttps://doi.org/10.1016/j.cemconcomp.2016.07.020
URIhttp://hdl.handle.net/10261/151473
DOI10.1016/j.cemconcomp.2016.07.020
Identificadoresdoi: 10.1016/j.cemconcomp.2016.07.020
issn: 0958-9465
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