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Título : | Investigation of the surface charge behaviour of ettringite: Influence of pH, calcium, and sulphate ions |
Autor : | Missana, Tiziana Almendros-Ginestà, Oscar Colmenero, Francisco Fernández, Ana María García-Gutiérrez, Miguel |
Palabras clave : | Ettringite Zetapotential Adsorption Double Layer Model Cement Electrophoretic properties |
Fecha de publicación : | ago-2024 |
Editorial : | ELSEVIER |
Citación : | Missana T., Almendros-Ginestá O., Colmenero F., Fernández A.M., García-Gutiérrez M.,Investigation of the surface charge behaviour of ettringite: Influence of pH, calcium, and sulphate ions, Heliyon 10 (2024) e36117 |
Resumen : | Ettringite is an important mineral that contributes to the overall performance of cementitious
materials. Knowledge of the surface charge behaviour of a solid is necessary for a mechanistic
description of surface processes such as adsorption or particle-particle interactions. The objective
of this study was to develop a model capable of reproducing ettringite surface charge as a function
of calcium, sulphate, and pH.
Ettringite was synthesised and characterised using different analytical, microscopic, and
spectroscopic techniques with the help of density functional theory. Electrophoretic mobility was
measured using laser Doppler electrophoresis in alkaline waters representative of the cementitious
environment.
The behaviour of the ettringite surface charge was shown to be quite complex as sulphate and
calcium acted in a competitive manner on the overall charge. The ζ-potential increases when the
calcium content increases, whereas it decreases when sulphate increases. This is due to the
possible adsorption of these ions at the surface, and the extent of the effect depends on the
relative concentrations of Ca and SO42 .
An electrostatic double layer model (DLM) was used to calculate the surface potential,
considering the adsorption of both calcium and sulphate, as possible ions determining the potential
(IDP), and formation of different complexes with ettringite surface functional groups
(SOH). The variations of the ζ-potential could be satisfactorily predicted under the different
chemical conditions of interest in a cementitious environment. |
URI : | https://doi.org/10.1016/j.heliyon.2024.e36117 http://documenta.ciemat.es/handle/123456789/3320 |
Aparece en las colecciones: | Artículos de Fisión Nuclear
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