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    Influence of calcium to silica ratio on aluminium uptake in calcium silicate hydrate

    New search for: L’Hôpital, E.
    New search for: Lothenbach, B.
    New search for: Kulik, D.A.
    New search for: Scrivener, K.

    Abstract Aluminium uptake in calcium silicate hydrate (C–S–H) was studied at different Ca/Si ratios from 0.6 to 1.6 at 20°C. Aluminium incorporation in C–S–H depends on the total amount of aluminium present in the sample. At low Al/Si ratio (≤0.05), the major part of the aluminium is taken up in C–S–H while at higher Al/Si ratio, the precipitation of stratlingite and/or katoite limits the Al/Si ratio in C–S–H to ≈0.15, regardless of the Ca/Si ratio. A strong correlation between the aqueous aluminium concentration and the aluminium uptake in the solid phase is observed. At high Ca/Si ratios, aluminium in C–S–H is observed mainly as octahedrally coordinated Al(VI) in TAH and the aluminium uptake increases with the aqueous aluminium concentration. At low Ca/Si ratio (≤0.8), aluminium is observed mainly as tetrahedrally coordinated Al(IV) and low aqueous aluminium concentrations (below detection limit) indicate a high affinity of aluminium towards C–S–H.

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    Influence of calcium to silica ratio on aluminium uptake in calcium silicate hydrate

    New search for: L’Hôpital, E.
    New search for: Lothenbach, B.
    New search for: Kulik, D.A.
    New search for: Scrivener, K.

    Abstract Aluminium uptake in calcium silicate hydrate (C–S–H) was studied at different Ca/Si ratios from 0.6 to 1.6 at 20°C. Aluminium incorporation in C–S–H depends on the total amount of aluminium present in the sample. At low Al/Si ratio (≤0.05), the major part of the aluminium is taken up in C–S–H while at higher Al/Si ratio, the precipitation of stratlingite and/or katoite limits the Al/Si ratio in C–S–H to ≈0.15, regardless of the Ca/Si ratio. A strong correlation between the aqueous aluminium concentration and the aluminium uptake in the solid phase is observed. At high Ca/Si ratios, aluminium in C–S–H is observed mainly as octahedrally coordinated Al(VI) in TAH and the aluminium uptake increases with the aqueous aluminium concentration. At low Ca/Si ratio (≤0.8), aluminium is observed mainly as tetrahedrally coordinated Al(IV) and low aqueous aluminium concentrations (below detection limit) indicate a high affinity of aluminium towards C–S–H.

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    Influence of calcium to silica ratio on aluminium uptake in calcium silicate hydrate

    New search for: L’Hôpital, E.
    New search for: Lothenbach, B.
    New search for: Kulik, D.A.
    New search for: Scrivener, K.

    Abstract Aluminium uptake in calcium silicate hydrate (C–S–H) was studied at different Ca/Si ratios from 0.6 to 1.6 at 20°C. Aluminium incorporation in C–S–H depends on the total amount of aluminium present in the sample. At low Al/Si ratio (≤0.05), the major part of the aluminium is taken up in C–S–H while at higher Al/Si ratio, the precipitation of stratlingite and/or katoite limits the Al/Si ratio in C–S–H to ≈0.15, regardless of the Ca/Si ratio. A strong correlation between the aqueous aluminium concentration and the aluminium uptake in the solid phase is observed. At high Ca/Si ratios, aluminium in C–S–H is observed mainly as octahedrally coordinated Al(VI) in TAH and the aluminium uptake increases with the aqueous aluminium concentration. At low Ca/Si ratio (≤0.8), aluminium is observed mainly as tetrahedrally coordinated Al(IV) and low aqueous aluminium concentrations (below detection limit) indicate a high affinity of aluminium towards C–S–H.

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    Title:

    Influence of calcium to silica ratio on aluminium uptake in calcium silicate hydrate

    Contributors:

    L’Hôpital, E. (author) / Lothenbach, B. (author) / Kulik, D.A. (author) / Scrivener, K. (author)

    Published in:

    Cement and Concrete Research ; 85 ; 111-121

    Publication date:

    2016-01-10

    Size:

    11 pages

    ISSN:

    0008-8846

    DOI:

    https://doi.org/10.1016/j.cemconres.2016.01.014

    Type of media:

    Article (Journal)

    Type of material:

    Electronic Resource

    Language:

    English

    Keywords:

    C–S–H , Ca/Si ratio , Aluminium uptake

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