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Espectros de rayos X y propiedades elásticas teóricas de los silicatos cálcicos hidratados cristalinos: comparación con los geles de cemento

Authors: Manzano, Hegoi; González-Teresa, R.; Dolado, Jorge S.; Ayuela, Andrés;

Espectros de rayos X y propiedades elásticas teóricas de los silicatos cálcicos hidratados cristalinos: comparación con los geles de cemento

Abstract

[EN] For 22 crystalline Calcium Silicates Hydrates, we have calculated their structure and their elastic properties by atomistic force field methods as well as simulate their Xray diffraction patterns. From the computed Young moduli, it can be suggested that the key parameters to determine the elastic properties of crystalline Calcium Silicate Hydrates are densities and water content. We have compared these trends with those of cementitious C-S-H gel and synthetic C-S-H type I as a function of their C/S ratios and nominal water content. Our comparison show that the experimentally suggested values of density and Young moduli for C-S-H gel lie in the range of the calculated CSH crystals. However, we conclude that a detailed correspondence might require investigating structurally within CSH gels the role of water and especially of Ca and Si sites through their C/S ratio.

[ES] En este trabajo se han calculado para 22 Silicatos Cálcicos Hidratados cristalinos, su estructura y sus propiedades elásticas mediante métodos atomísticos “force field”, así como simulado sus espectros de difracción de rayos X. De los módulos de Young calculados se puede deducir, que los parámetros clave que determinan las propiedades elásticas de los Silicatos Cálcicos Hidratados cristalinos son la densidad y el contenido en agua. Nuestros resultados muestran que los valores experimentales de la densidad y de los módulos de Young para el gel C-S-H están dentro del rango de los cristales de CSH calculados. Sin embargo, podemos concluir que para establecer una correlación más directa sería necesario investigar el papel que juegan el agua y sobre todo el Ca y Si, mediante la relación C/S, en la estructura del gel CSH.

Este trabajo ha sido respaldado económicamente por el proyecto Codice, bajo el programa NMP del FP7, proyecto 214030, por el Gobierno vasco a través del proyecto Nanomaterials (IE05-151) bajo el programa Etortek (iNanogune), el Ministerio Español de Ciencia y Tecnología (Fis2007-66711-C02-02, y proyecto Monacem), Y la Universidad del País Vasco (IT-366- 07). Los medios computacionales y el SGI-SGIKerUPV son agradecidos. R. González-Teresa agradece la beca recibida de la asociación EITE, y H. Manzano la recibida del Gobierno vasco a través del programa de “Especialización de Personal Investigador” del Departamento de Educación, Universidades e Investigación.

13 páginas, 3 figuras, 2 tablas.

Peer reviewed

Keywords

Silicatos cálcicos hidratados cristalinos, X-ray, Nanostructure, CSH gels, Crystalline calcium silicate hydrates, Simulación atomística, Nanoestructura, Elastic properties, Rayos X, Gel CSH, Propiedades elásticas, Atomistic simulations

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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