Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 31, Issue 12, Pages 2043-2056Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2011.04.036
Keywords
Microstructure-final; Spectroscopy; Mechanical properties; Atomistic modelling; Cements
Categories
Funding
- European Union [NMP3-SL-2008-214030]
- Spanish Ministry of Science and Innovation [BIA2007-61380]
- Spanish National Research Council
- Basque Government through Education, University and Research Department
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For 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. (C) 2011 Elsevier Ltd. All rights reserved.
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