Analysis of alkali-activated mineral wool-slag binders
evaluating the differences between one-part and two-part variations
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 (TU Delft - Materials and Environment)
Tero Luukkonen (University of Oulu)
Juho Yliniemi (University of Oulu)
Mirja Illikainen (University of Oulu)
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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.
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