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Ultrafine Silica Additives Behavior during Alkali-Silica Reaction Long-Term Expansion Test
Department of Technology of Constructional and Special Binders, Faculty of Chemistry of Substances and Materials, St. Petersburg State Institute of Technology, St. Petersburg, Russia
Department of Technology of Constructional and Special Binders, Faculty of Chemistry of Substances and Materials, St. Petersburg State Institute of Technology, St. Petersburg, Russia
Institute of High-Molecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia
- 1 Department of Technology of Constructional and Special Binders, Faculty of Chemistry of Substances and Materials, St. Petersburg State Institute of Technology, St. Petersburg, Russia
- 2 Department of Technology of Constructional and Special Binders, Faculty of Chemistry of Substances and Materials, St. Petersburg State Institute of Technology, St. Petersburg, Russia
- 3 Institute of High-Molecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia
Materials Sciences and Applications·Volume 05 (2014)·Pages 66–72·Published 25 February 2014·DOI10.4236/msa.2014.52010
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Abstract
A silica fume, precipitated silica, metakaolin and siliceous fly ash behavior as constituents of mortars w as studied, while mortar samples have be en tested for long - term alkali-silica reaction expansion in accordance to the GOST 8269.0 specification. Solid-state 29 Si-MAS NMR spectroscopy and thermogravimetric analysis were used to describe Portland cement hydration, supplementary cementitious material pozzolanic reaction and to establish a structure of products of those processes. It was found that long-term test conditions, in contrast to the accelerated test, do not affect the composition of products formed too much, compared to normal conditions. This allows results obtained with long-term test to be expected as more relevant in terms of predicting of supplementary cementitious materials inhibiting properties.
KeywordsAlkali-Silica ReactionSupplementary Cementitious MaterialsMAS NMRThermogravimetric AnalysisPozzolanic Reaction
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