Calcium chloride acceleration in ordinary Portland cement

Tapio Vehmas, Anna Kronlöf, Andrzej Cwirzen

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    Early-age hydration of ordinary Portland cement is now acknowledged to originate from nucleation and crystal growth of calcium-silicate-hydrates. The acceleration mechanism of water-soluble inorganic substances, such as calcium chloride, is still unclear. In the present study, the acceleration mechanism was approached in two independent ways. First, the acceleration effect of filler materials (limestone and quartz powder) and calcium chloride (CaCl2) were studied experimentally with a conduction calorimeter. Second, the calcium chloride effect was studied with thermodynamic modelling. The experimental test results showed that the filler materials accelerated the acceleration period of ordinary Portland cement hydration, whereas calcium chloride accelerated hydration throughout the 24 h measuring period. A synergistic effect was observed with fillers and calcium chloride. Thermodynamic modelling indicated that calcium chloride provides a supersaturation with respect to pure calcium-silicate-hydrate. It was concluded that the supersaturation provides a qualitative explanation for both calcium chloride-induced acceleration and the synergistic effect observed with fillers.

    Original languageEnglish
    Pages (from-to)856-863
    Number of pages8
    JournalMagazine of Concrete Research
    Volume70
    Issue number16
    DOIs
    Publication statusPublished - 1 Aug 2018
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Calcium Chloride
    Calcium chloride
    Portland cement
    Fillers
    Hydration
    Silicic Acid
    Calcium silicate
    Supersaturation
    Hydrates
    Thermodynamics
    Quartz
    Calcium Carbonate
    Crystallization
    Limestone
    Calorimeters
    Crystal growth
    Powders
    Nucleation
    Water

    Keywords

    • Admixtures
    • Cement
    • Cementitious materials
    • Modeling

    Cite this

    Vehmas, Tapio ; Kronlöf, Anna ; Cwirzen, Andrzej. / Calcium chloride acceleration in ordinary Portland cement. In: Magazine of Concrete Research. 2018 ; Vol. 70, No. 16. pp. 856-863.
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    Calcium chloride acceleration in ordinary Portland cement. / Vehmas, Tapio; Kronlöf, Anna; Cwirzen, Andrzej.

    In: Magazine of Concrete Research, Vol. 70, No. 16, 01.08.2018, p. 856-863.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Calcium chloride acceleration in ordinary Portland cement

    AU - Vehmas, Tapio

    AU - Kronlöf, Anna

    AU - Cwirzen, Andrzej

    PY - 2018/8/1

    Y1 - 2018/8/1

    N2 - Early-age hydration of ordinary Portland cement is now acknowledged to originate from nucleation and crystal growth of calcium-silicate-hydrates. The acceleration mechanism of water-soluble inorganic substances, such as calcium chloride, is still unclear. In the present study, the acceleration mechanism was approached in two independent ways. First, the acceleration effect of filler materials (limestone and quartz powder) and calcium chloride (CaCl2) were studied experimentally with a conduction calorimeter. Second, the calcium chloride effect was studied with thermodynamic modelling. The experimental test results showed that the filler materials accelerated the acceleration period of ordinary Portland cement hydration, whereas calcium chloride accelerated hydration throughout the 24 h measuring period. A synergistic effect was observed with fillers and calcium chloride. Thermodynamic modelling indicated that calcium chloride provides a supersaturation with respect to pure calcium-silicate-hydrate. It was concluded that the supersaturation provides a qualitative explanation for both calcium chloride-induced acceleration and the synergistic effect observed with fillers.

    AB - Early-age hydration of ordinary Portland cement is now acknowledged to originate from nucleation and crystal growth of calcium-silicate-hydrates. The acceleration mechanism of water-soluble inorganic substances, such as calcium chloride, is still unclear. In the present study, the acceleration mechanism was approached in two independent ways. First, the acceleration effect of filler materials (limestone and quartz powder) and calcium chloride (CaCl2) were studied experimentally with a conduction calorimeter. Second, the calcium chloride effect was studied with thermodynamic modelling. The experimental test results showed that the filler materials accelerated the acceleration period of ordinary Portland cement hydration, whereas calcium chloride accelerated hydration throughout the 24 h measuring period. A synergistic effect was observed with fillers and calcium chloride. Thermodynamic modelling indicated that calcium chloride provides a supersaturation with respect to pure calcium-silicate-hydrate. It was concluded that the supersaturation provides a qualitative explanation for both calcium chloride-induced acceleration and the synergistic effect observed with fillers.

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    KW - Cement

    KW - Cementitious materials

    KW - Modeling

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