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- W3128520750 endingPage "106373" @default.
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- W3128520750 abstract "In this study, a multi-proxy approach combining 29 Si, 27 Al and 1 H MAS-NMR, FEG-EPMA, XANES at the Cu K-edge and XRD analytics with hydrochemical tools such as ICP-OES analyses, oxygen-isotope signatures, and thermodynamic modelling was applied to K-silicate-activated metakaolin specimens - with and without CuSO 4 ·5H 2 O addition - exposed to sulfuric acid at pH = 2 for 35 days. The results revealed a multistage deterioration mechanism governed by (i) acid diffusion, (ii) leaching of K-A-S-H, (iii) microstructural damage related to precipitation of expansive (K,Ca,Al)-sulfate-hydrate phases (iv) complete dissolution of the K-A-S-H framework, (v) and formation of silica gel in the outermost corroded regions. Copper ions were mainly located in layered spertiniite-chrysocolla-like phases in the as-cured materials. The results demonstrate an overall negative effect of Cu addition on chemical material durability, implying that the reported higher durability of Cu-doped AAM in biocorrosion environments can be best explained by bacteriostatic effects." @default.
- W3128520750 created "2021-02-15" @default.
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- W3128520750 date "2021-04-01" @default.
- W3128520750 modified "2023-10-16" @default.
- W3128520750 title "Deterioration mechanism of alkali-activated materials in sulfuric acid and the influence of Cu: A micro-to-nano structural, elemental and stable isotopic multi-proxy study" @default.
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- W3128520750 doi "https://doi.org/10.1016/j.cemconres.2021.106373" @default.
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