High strength one-part alkali-activated slag blends designed by particle packing optimization
Perumal, Priyadharshini; Sreenivasan, Harisankar; Luukkonen, Tero; Kantola, Anu M.; Telkki, Ville-Veikko; Kinnunen, Päivö; Illikainen, Mirja (2021-06-22)
Perumal, P., Sreenivasan, H., Luukkonen, T., Kantola, A. M., Telkki, V.-V., Kinnunen, P., & Illikainen, M. (2021). High strength one-part alkali-activated slag blends designed by particle packing optimization. Construction and Building Materials, 299, 124004. https://doi.org/10.1016/j.conbuildmat.2021.124004
© 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe2021062940589
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Abstract
This paper focuses on the development of high-strength and eco-friendly one-part (i.e., dry-mix) alkali-activated mortar with ground granulated blast furnace slag as the main precursor. In addition to slag, phyllite dust and silica fume were used as co-binders in binary and ternary blends to improve mechanical properties. Particle packing optimization was employed for the mix proportioning to achieve a compact matrix skeleton. The results revealed that a 10% increase in mortar strength was gained after adjusting the particle packing and an additional 20% increment was observed after blending the slag with other mineral admixtures. Ternary blend with all three binders achieved a mortar compressive strength value of 145 MPa (at 28 d age), which is the highest strength reported in one-part alkali-activated materials. Additionally, ternary blends present potential economic benefits because of their ability to replace slag with lower-cost industrial side streams.
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