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Luschnig, Sarah
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article
Cu- and Zn-doped alkali activated mortar – Properties and durability in (bio)chemically aggressive wastewater environments
Abstract
<p>Metakaolin-based alkali activated mortars (AAM) - with and without CuSO<sub>4</sub>·5H<sub>2</sub>O and ZnO addition (mass ratio M<sup>n+</sup>/solid binder 0.08% to 1.7%) - were casted and exposed within an extensive long-term field campaign over the period of 20 months to a sewer basin, strongly affected by biogenic acid corrosion. (Un-)exposed AAM were tested regarding their physicochemical and microstructural properties, bioreceptivity and overall durability. Metal addition led to a retarding effect during alkali-activation reaction, as well as to an increase in open porosity of up to 3.0% and corresponding lower compressive strength of up to 10.9%. Reduced microbial colonization and diversity were observed on AAM with Cu, while Zn addition led to increased biodiversity. We propose that the observed higher durability of Cu-doped AAM is due to antibacterial effects and associated reduction of biogenic acid production, superseding overall negative effects of metal-dosage on physical material properties. Observed lower durability of Zn-doped AAM was related to combined negative physicochemical and microbial effects.</p>