Performance of Fe-Rich Alkali-Activated Materials in Na2SO4 Solution: Role of MgO/(MgO + CaO) in the Slag

Nana Wen; Arne Peys; Tobias Hertel; Yiannis Pontikes

doi:10.3390/materproc2021005125

Materials Proceedings (Apr 2022)

Performance of Fe-Rich Alkali-Activated Materials in Na2SO4 Solution: Role of MgO/(MgO + CaO) in the Slag

Nana Wen,
Arne Peys,
Tobias Hertel,
Yiannis Pontikes

Affiliations

Nana Wen: Department of Materials Engineering, Katholieke Universiteit Leuven (KU Leuven), 3001 Leuven, Belgium
Arne Peys: Sustainable Materials Management, Flemish Institute for Technological Research (VITO), Boeretang 200, 2400 Mol, Belgium
Tobias Hertel: Department of Materials Engineering, Katholieke Universiteit Leuven (KU Leuven), 3001 Leuven, Belgium
Yiannis Pontikes: Department of Materials Engineering, Katholieke Universiteit Leuven (KU Leuven), 3001 Leuven, Belgium

DOI: https://doi.org/10.3390/materproc2021005125
Journal volume & issue: Vol. 5, no. 1
p. 125

Abstract

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To enable the usage of non-ferrous metallurgy slags in alkali-activated materials (AAMs), the influence of the chemical composition of slags on durability must be better understood. In this work, two slags were synthesized with different MgO/(MgO + CaO) weight ratios to investigate the effect on the sulfate resistance (Na2SO4) of AAMs. Experimental results suggested that a higher MgO/(MgO + CaO) ratio does not lead to higher strength, but the trend of the mass change and compressive strength change of two AAMs is quite similar upon Na2SO4 exposure for 24 weeks. The leaching of elements (Na, Al, and Si) during Na2SO4 exposure is more significant in the early stage, while Ca leaching is more pronounced in the late stage.

Published in Materials Proceedings

ISSN: 2673-4605 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Chemical technology: Chemical engineering
Website: https://www.mdpi.com/journal/materproc

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