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Mechanism of zinc oxide retardation in alkali-activated materials: an in situ X-ray pair distribution function investigation

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Abstract

Alkali-activated materials are a new class of sustainable materials that can help supplant highly CO2-intensive ordinary Portland cement (OPC). Chemical admixtures and additives that manipulate the hydration and setting of OPC are readily utilized in the construction industry. However, for alkali-activated materials, the impact of these additives on the evolution of the atomic structure of the binder gel is largely unknown. Here, we utilize nano-ZnO (nanoparticles of zinc oxide), a known retarder for OPC hydration, and investigate its influence on the alkali-activation reaction in high and low calcium alkali-activated materials (slag and metakaolin systems, respectively). Using isothermal calorimetry and in situ X-ray pair distribution function analysis, the mechanism of nano-ZnO retardation in alkali-activated materials is uncovered, revealing that calcium plays a pivotal role in dictating whether nano-ZnO has an impact on the alkali-activation reaction. These results also provide important insight on the ability of slag and metakaolin-based alkali-activated materials to effectively immobilize zinc within the binder gel, which is of relevance to the waste solidification/stabilization community.

Graphical abstract: Mechanism of zinc oxide retardation in alkali-activated materials: an in situ X-ray pair distribution function investigation

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Publication details

The article was received on 12 Jan 2017, accepted on 22 Mar 2017 and first published on 22 Mar 2017


Article type: Paper
DOI: 10.1039/C7TA00412E
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Mechanism of zinc oxide retardation in alkali-activated materials: an in situ X-ray pair distribution function investigation

    N. Garg and C. E. White, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA00412E

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