Analysis of alkali-activated mineral wool-slag binders: evaluating the differences between one-part and two-part variations

Elijah Adesanya*, Rawia Dabbebi, Christine Rößler, Majda Pavlin, Zhenming Li, Tero Luukkonen, Juho Yliniemi, Mirja Illikainen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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.

Original languageEnglish
Pages (from-to)1001-1011
Number of pages11
JournalJournal of Material Cycles and Waste Management
Volume26
Issue number2
DOIs
Publication statusPublished - 2024

Keywords

  • Alkali activation
  • Blast furnace slag
  • Glass wool
  • One-part
  • Stone wool
  • Two-part

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