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Título

Influence of the composition of the binder and the carbonation on the zeta potential values of hardened cementitious materials

AutorCastellote, M.; Llorente, I.; Andrade, C.
Palabras claveElectroosmotic flux
Composition of the binder
Carbonation
Zeta potential
External solution
Hardened cementitious matrix
Fecha de publicación2006
EditorElsevier
CitaciónCement and Concrete Research; Vol. 36; nº 10; págs. 1915-1921; (2006)
ResumenElectroosmotic experiments have been carried out on eight different mixes of hardened cementitious matrixes including concrete, mortar and pastes, different types of binders, carbonated and non-carbonated specimens and different test conditions. From these trials, the zeta potential values have been determined and the optimum experimental parameters and devices have been established. In addition, the influence of the composition of the binder on the zeta potential has been quantified indicating that higher amounts of Al2O3 in the binder lead to higher positive values of zeta potential, while the SiO2 acts just on the opposite side. This has been explained in terms of the different i.e.p. (isoelectric point) for both oxides. Concerning the influence of carbonation, it increases the absolute value of the zeta potential toward more negative values; this behaviour has been attributed to the influence of the specifically adsorbed Ca2+ in the negative sites of the surface in the non-carbonated samples.
Versión del editorhttp://www.sciencedirect.com/science/article/pii/S000888460600161X
URIhttp://hdl.handle.net/10261/46750
ISSN0008-8846
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