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

作　　者：Alexey Brykov Mikhail Voronkov Maxim Mokeev 

机构地区：[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]Institute of High-Molecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia

出　　处：《Materials Sciences and Applications》2014年第2期66-72,共7页材料科学与应用期刊（英文）

摘　　要：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.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.

关 键 词：Alkali-Silica REACTION SUPPLEMENTARY Cementitious Materials MAS NMR THERMOGRAVIMETRIC Analysis Pozzolanic REACTION 

分 类 号：TU5[建筑科学—建筑技术科学]