TITLE:
Ultrafine Silica Additives Behavior during Alkali-Silica Reaction Long-Term Expansion Test
AUTHORS:
Alexey Brykov, Mikhail Voronkov, Maxim Mokeev
KEYWORDS:
Alkali-Silica Reaction; Supplementary Cementitious Materials; MAS NMR; Thermogravimetric Analysis; Pozzolanic Reaction
JOURNAL NAME:
Materials Sciences and Applications,
Vol.5 No.2,
February
25,
2014
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.