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Chloride binding in Portland composite cements containing metakaolin and silica fume
Chalmers University of Technology, Department of Architecture and Civil Engineering, Gotenburg, Sweden.
Technical University of Munich, TUM School of Engineering and Design, Department of Materials Engineering, Professorship for Mineral Construction Materials, Munich, Germany.
Technical University of Denmark, Department of Environmental and Resource Engineering, Kongens Lyngby, Denmark.
Umeå University, Faculty of Science and Technology, Department of Chemistry.ORCID iD: 0000-0001-8819-2278
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2022 (English)In: Cement and Concrete Research, ISSN 0008-8846, E-ISSN 1873-3948, Vol. 161, article id 106924Article in journal (Refereed) Published
Abstract [en]

This paper investigates how the composition of Portland composite cements affects their chloride-binding properties. Hydrated cement pastes prepared with a reference Portland cement and composite Portland cements containing metakaolin and/or silica fume were exposed to NaCl or CaCl2 solutions. Chloride-binding isotherms were determined and the hydrate assemblage was investigated using TGA, XRD, 27Al NMR, 29Si NMR and thermodynamic modelling. Compared to the reference Portland cement paste, silica fume replacement did not alter the chloride-binding capacity. The metakaolin replacement resulted in the highest chloride-binding capacity. When combining silica fume with metakaolin, the chloride binding is similar to the reference Portland cement. In this study the differences in chloride binding were linked not only to changes in the AFm content, but also to alterations in the Al-uptake and chain length of the C(-A)-S-H.

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 161, article id 106924
Keywords [en]
Chemical and physical chloride binding, Durability, Friedel's salt, Supplementary cementitious materials (SCM), Sustainability
National Category
Ceramics Other Civil Engineering
Identifiers
URN: urn:nbn:se:umu:diva-203282DOI: 10.1016/j.cemconres.2022.106924ISI: 000843803300001Scopus ID: 2-s2.0-85135713495OAI: oai:DiVA.org:umu-203282DiVA, id: diva2:1728202
Funder
Swedish Research Council FormasScience for Life Laboratory, SciLifeLabAvailable from: 2023-01-18 Created: 2023-01-18 Last updated: 2023-03-24Bibliographically approved

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Figueira, Joao

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