Comparison of one-part and two-part alkali-activated metakaolin and blast furnace slag
Segura, Isabel Pol; Luukkonen, Tero; Yliniemi, Juho; Sreenivasan, Harisankar; Damø, Anne Juul; Jensen, Lars Skaarup; Canut, Mariana; Kantola, Anu M.; Telkki, Ville-Veikko; Jensen, Peter Arendt (2022-10-13)
Segura, I.P., Luukkonen, T., Yliniemi, J. et al. Comparison of One-Part and Two-Part Alkali-Activated Metakaolin and Blast Furnace Slag. J. Sustain. Metall. 8, 1816–1830 (2022). https://doi.org/10.1007/s40831-022-00606-9
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https://urn.fi/URN:NBN:fi-fe2022101762250
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Abstract
One-part alkali-activated materials prepared with solid-form alkali activator are gaining attention in the construction industry, as they are an easier and safer approach for cast-in-situ applications in comparison with two-part approach (i.e., involving the use of alkali-activator solutions). The present study compares the one-part and conventional two-part mixing methods with two aluminosilicate precursors, metakaolin and ground granulated blast-furnace slag, using identical mix designs (in terms of molar ratios of SiO₂, Al₂O₃, and Na₂O) with both preparation methods. The results revealed that using one-part mix delays the setting time, increases the heat of reaction, decreases the shrinkage, and reaches between 80 and 85% of the compressive strength of the two-part mix. In addition, scanning electron microscopy, thermogravimetric analysis, and X-ray diffraction analysis showed no major differences between one- and two-part. However, energy-dispersive X-ray spectroscopy and magic angle spinning nuclear magnetic resonance experiments indicated that the extent of reaction in two-part alkali-activated mixes is higher than for one-part.
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