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Título

A model for the C-A-S-H gel formed in alkali-activated slag cements

AutorPuertas, F.; Palacios, Marta; Manzano, H.; Dolado, J. S.; Rico, A.
Palabras claveMicrostructure-final
Spectroscopy
Mechanical properties
Atomistic modelling
Cements
Fecha de publicación2011
EditorElsevier
CitaciónJournal of the European Ceramic Society
ResumenFor first time, an experimental and computational study has been conducted to define a structural model for the C-A-S-H gel forming in alkali-activated slag (AAS) pastes that would account for the mechanical properties of these materials. The study involved a comparison with the C-S-H gel forming in a Portland cement paste. The structure of the C-A-S-H gels in AAS pastes depends on the nature of the alkali activator. When the activator is a NaOH, the structure of the C-S-H gel falls in between tobermorite 1.4 nm with a mean chain length of five, and tobermorite 1.1 nm with a mean length of 14. When waterglass is the activator the structure of the C-A-S-H gel is indicative of the co-existence of tobermorite 1.4 nm with a chain length of 11 and tobermorite 1.1 nm with a chain length of 14. This very densely packed structure gives rise to excellent mechanical properties.
Versión del editorhttp://www.sciencedirect.com/science/article/pii/S0955221911002159
URIhttp://hdl.handle.net/10261/51578
ISSN0955-2219
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