The effect of activator concentration on reaction degree and structure formation of alkali-activated ground granulated blast furnace slag
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Blast furnace slag is an industrial by-product that can be alkali-activated to yield adhesive and cementitious compounds, whose production is less energy-intensive and CO2 emission less than in ordinary Portland cement manufacture. The reaction products of alkali-activated blast furnace slag have been widely investigated. They are similar to calcium silicate hydrates (CSH) and calcium aluminate hydrates (CAH) of Portland cements apart from incorporated tetrahedral aluminium into the dreierketten structure of the CSH  and hydrotalcite if the slag contains magnesium [2, 3]. Considering different activation concentrations, Song and co-workers  determined in calorimetric investigations a faster hydration when more NaOH is present. The microstructure observed using ESEM was not affected.
In this work the effect of the activator concentration on the reaction degree and the structure formation of an alkali-activated slag were investigated using 27Al and 29Si NMR spectroscopy.