Ultrafine Silica Additives Behavior during Alkali-Silica Reaction Long-Term Expansion Test

Alexey Brykov, Mikhail Voronkov, Maxim Mokeev

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.

DOI: 10.4236/msa.2014.52010                

Abstract

A silica fume, precipitated silica, metakaolin and siliceous fly ash behavior as constituents of mortars was studied, while mortar samples have been tested for long-term alkali-silica reaction expansion in accordance to the GOST 8269.0 specification. Solid-state ²⁹Si-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.

Keywords

Alkali-Silica Reaction; Supplementary Cementitious Materials; MAS NMR; Thermogravimetric Analysis; Pozzolanic Reaction

Conflicts of Interest

The authors declare no conflicts of interest.

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