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Chloride binding in Portland composite cements containing metakaolin and silica fume

Baba Ahmadi, Arezou, 1985 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
Machner, Alisa (författare)
Technische Universität München (TUM),Technical University of Munich (TUM),Technical University of Munich, TUM School of Engineering and Design, Department of Materials Engineering, Professorship for Mineral Construction Materials, Munich, Germany
Kunther, Wolfgang (författare)
Danmarks Tekniske Universitet,Technical University of Denmark,Technical University of Denmark, Department of Environmental and Resource Engineering, Kongens Lyngby, Denmark
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Figueira, Joao (författare)
Umeå universitet,Kemiska institutionen,Umeå University
Hemstad, Petter (författare)
Norges teknisk-naturvitenskapelige universitet (NTNU),Norwegian University of Science and Technology (NTNU),Norwegian University of Science and Technology, NTNU, Department of Structural Engineering, Trondheim, Norway
De Weerdt, Klaartje (författare)
Norges teknisk-naturvitenskapelige universitet (NTNU),Norwegian University of Science and Technology (NTNU),Norwegian University of Science and Technology, NTNU, Department of Structural Engineering, Trondheim, Norway
Babaahmadi, Arezou (författare)
Chalmers University of Technology, Department of Architecture and Civil Engineering, Gotenburg, Sweden
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 (creator_code:org_t)
Elsevier BV, 2022
2022
Engelska.
Ingår i: Cement and Concrete Research. - : Elsevier BV. - 0008-8846 .- 1873-3948. ; 161
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • 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.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Keramteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Ceramics (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Industriell bioteknik -- Biomaterial (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Industrial Biotechnology -- Bio Materials (hsv//eng)
MEDICIN OCH HÄLSOVETENSKAP  -- Medicinsk bioteknologi -- Biomaterialvetenskap (hsv//swe)
MEDICAL AND HEALTH SCIENCES  -- Medical Biotechnology -- Biomaterials Science (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Annan samhällsbyggnadsteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Other Civil Engineering (hsv//eng)

Nyckelord

Friedel's salt
Chemical and physical chloride binding
Durability
Supplementary cementitious materials (SCM)
Sustainability

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