Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 96, Issue 6, Pages 1951-1957Publisher
WILEY
DOI: 10.1111/jace.12247
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Funding
- Universidad del Valle (Colombia)
- Patrimonio Autonomo Fondo Nacional de Financiamiento para la Ciencia, la Tecnologia y la Innovacion Francisco Jose de Caldas - COLCIENCIAS, GEOCERAM project
- U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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The effect of the activator concentration on the structure of alkali silicate-activated slag/metakaolin pastes is assessed through synchrotron radiation-based X-ray techniques. As main reaction products, both calcium aluminosilicate hydrate (C-A-S-H) and sodium/calcium aluminosilicate hydrate [(C,N)-A-S-H] type gels are formed in activated binders solely based on slag, along with the zeolitic products gismondine and garronite. In activated blended pastes, the inclusion of metakaolin in the binder hinders the formation of zeolite products, instead favoring the formation of a (C,N)-A-S-H type gel consistent with the activation of metakaolin in the presence of high concentrations of Ca. The formation of the two distinct binding products is confirmed by high-resolution X-ray fluorescence microscopy, where the inner products and the outer products have compositions consistent with (C,N)-A-S-H and C-A-S-H type gels, respectively. These results provide important new insights into the gel chemistry and micro/nanostructure of blended alkali-activated binder systems.
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