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Kinetic analysis of the calcium hydroxide formed in the hydration of pure C3S and with the addition of Ca(NO3)2

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Abstract

By using a simultaneous thermogravimetry (TG) and differential thermal analyzer (DTA), the hydration processes of the pure C3S and with the addition of Ca(NO3)2 was followed. The peak temperature was determined and kinetic analysis on one of the hydration products, calcium hydroxide, was performed. Results show that the use of Ca(NO3)2 increased the activation energy value of calcium hydroxide formed which is one aspect of the accelerating properties of Ca(NO3)2 while there is no sign of hydration for the addition of sucrose which proved its retarding property. It was also shown that the activation energy increased when the hydrated pastes aged.

Zusammenfassung

Unter Einsatz eines simultanen TG-DTA-Gerätes wurde die Hydratation von reinem C3S und unter Zusatz von Ca(NO3)2 verfolgt. Die Peaktemperatur wurde ermittelt und eine kinetische Analyse an einem der Hydratationsprodukte—Calciumhydroxid—durchgefürht. Die Resultate zeigen, daß der Einsatz von Ca(NO3)2 den Wert der Aktivierungsenergie des gebildeten Calciumhydroxides erhöht, was einer der Aspekte, der beschleunigenden Eigenschaften von Ca(NO3)2 ist, während es für eine Hydratation bei der Addition von Saccharose keine Anzeichen gibt, was eine verzögernde Eigenschaft beweist. Ein Ansteigen der Aktivierungsenergien beim Altern der hydratisierten Massen konnte nachgewiesen werden.

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Authors and Affiliations

  1. Department of Chemistry and College of Pharmacy, The University of Toledo, 43606, Toledo, OH, USA

    D. Chen & D. Dollimore

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  1. D. Chen
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  2. D. Dollimore
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Cement chemists note: C=CaO, H=H2 and S=SiO2

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Chen, D., Dollimore, D. Kinetic analysis of the calcium hydroxide formed in the hydration of pure C3S and with the addition of Ca(NO3)2 . Journal of Thermal Analysis 44, 1001–1011 (1995). https://doi.org/10.1007/BF02547528

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  • DOI: https://doi.org/10.1007/BF02547528

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