Analysis of alkali-activated mineral wool-slag binders

evaluating the differences between one-part and two-part variations

Journal article (2024)

Authors

Elijah Adesanya University of Oulu
Rawia Dabbebi University of Oulu
Christine Rößler Bauhaus University Weimar
Majda Pavlin Slovenian National Building and Civil Engineering Institute
Z. Li Materials and Environment - CEG
Tero Luukkonen University of Oulu
Juho Yliniemi University of Oulu
Mirja Illikainen University of Oulu
Research Group
Materials and Environment (CEG) (TU Delft)
Copyright: © 2024 Elijah Adesanya, Rawia Dabbebi, Christine Rößler, Majda Pavlin, Z. Li, Tero Luukkonen, Juho Yliniemi, Mirja Illikainen
DOI
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https://doi.org/10.1007/s10163-023-01878-3
Blast furnace slag Alkali activation Glass wool One-part Stone wool Two-part
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Published Date

2024

Language

English

Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

Two synthesis pathways (one- and two-part) in alkali-activated binders were compared using ground granulated blast furnace slag (GGBFS), mineral wool (MW) activated using dry and liquid alkali activators with similar Na2O/SiO2 modulus. The effect of activator type on reaction kinetics, strength development, setting times, and durability shows that one-part synthesis does not only improve early strength, but also provide better durability properties. While the highest compressive strength (56 MPa, 90 days) was achieved for the one-part mix (DM), the reaction products (presence of Mg–Al layered double hydroxide and C–S–H-like phases) observed for both mortar mixes were similar. The DM mortars showed better resistance to sulfate attack than two-part mix (WM) mortars and sets faster. The results highlight the significance of the one-part pathways in the synthesis of alkali-activated materials.