Durability of alkali activated slag in a marine environment: Influence of alkali ion

Irena Nikolić, Milena Tadić, Ivona Janković-Častvan, Vuk V. Radmilović, Velimir R. Radmilović

Abstract


The durability of alkali-activated steel electric arc furnace slag (EAFS) in a marine environment was evaluated with respect to the chemical composition of the alkaline activator. Two different alkaline activators have been used: a mix­ture of NaOH and Na2SiO3 solutions (Na-activator), as well as a mixture of KOH and K2SiO3 solutions (K-activator). The obtained results gave the insight into the influence of alkaline activator chemistry on the compressive strength and dura­bility of alkali-activated slag (AAS), which was exposed to the damaging sea­water environment. The porosity of AAS was found to be the most important factor with regards to the strength and durability of these materials in marine environment. Sodium based alkali-activated slag (Na-AAS) displayed lower por­osity and higher compressive strength compared to potassium based AAS (K-
-AAS). Lower porosity and thus a lower rate of water uptake by AAS matrix, i.e., the lower sorptivity was exhibited by the Na-AAS when compared to K-AAS. Hence, Na-AAS exhibited better durability in a marine environment.


Keywords


steel slag; seawater; sorptivity; brucite

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DOI: https://doi.org/10.2298/JSC180328057N

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