Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7885442 | Cement and Concrete Research | 2014 | 11 Pages |
Abstract
Electron microscopic characterisation of 7-year old alkali-activated blast-furnace slag concretes enabled the identification of distinct microstructural features, providing insight into the mechanisms by which these materials evolve over time. Backscattered electron images show the formation of Liesegang-type ring formations, suggesting that the reaction at advanced age is likely to follow an Oswald supersaturation-nucleation-depletion cycle. Segregation of Ca-rich veins, related to the formation of Ca(OH)2, is observed in microcracked regions due to the ongoing reaction between the pore solution and available calcium from remnant slag grains. A highly dense and uniform interfacial transition zone is identified between siliceous aggregate particles and the alkali activated slag binders, across the concretes assessed. Alkali-activated slag concretes retain a highly dense and stable microstructure at advanced ages, where any microcracks induced at early ages seem to be partially closing, and the remnant slag grains continue reacting.
Keywords
Related Topics
Physical Sciences and Engineering
Engineering
Industrial and Manufacturing Engineering
Authors
Rackel San Nicolas, Susan A. Bernal, Ruby MejÃa de Gutiérrez, Jannie S.J. van Deventer, John L. Provis,