Skip to main content
SpringerLink
Log in

Hydration studies of modified OPC pastes by differential scanning calorimetry and thermogravimetry

  • Published:
Journal of thermal analysis Aims and scope Submit manuscript

Abstract

Thermal methods are used extensively in investigating cements and effects of additives on their hydration behaviour. Calcium chloride is the most effective and widely used accelerator for cement hydration, but the result is largely dependent on the rate at which it is added. In this study the influence of calcium chloride dosage on the hydration behaviour of OPC pastes aged for different periods has been investigated by means of differential scanning calorimetry (DSC), thermogravimetry (TG) and X-ray diffraction (XRD) methods. The results are discussed in relation to the relative amounts of calcium hydroxide and total reaction product formed. Chloroaluminate was a product of hydration in the samples dosed with greater than 1% calcium chloride. XRD was unable of itself to differentiate between monochloroaluminate and the calcium aluminate hydrate C4AH13 when present in small amounts. Thermal methods proved effective in characterising the products of hydration in the presence of chloride.

Zusammenfassung

Bei der Untersuchung von Zement und des Einflusses von Additiven auf das Hydratationsverhalten von Zement finden thermoanalytische Methoden eine breite Anwendung. Der effektivste und meistbenutzte Beschleuniger für die Hydratation von Zement ist Calciumchlorid, aber die Ergebnisse hängen stark von der Dosiergeschwindigkeit ab. In vorliegender Studie wird mittels DSC-, TG- und Röntgendiffraktionsmethoden der Einflu\ der Dosierung von Calciumchlorid auf das Hydratationsverhalten von verschieden alten OPC-Zementbreiproben untersucht. Die Ergebnisse wurden in Bezug auf die relativen Mengen Calciumhydroxid und das gebildete Gesamtreaktionsprodukt gewertet.

Bei Dosen von mehr als 1% Calciumchlorid konnte als Hydratationsprodukt Chloraluminat festgestellt werden. Sind Monochloraluminat und das Calciumaluminathydrat C4AH13 in geringen Mengen vorhanden, kann man zwischen den beiden mittels Röntgendiffraktion nicht unterscheiden. Thermoanalytische Methoden erwiesen sich als effektives Hilfsmittel bei der Charakterisierung der Produkte der Hydratation in Gegenwart von Chlorid.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. B. E. I. Abdelrazig, D. G. Bonner, D. V. Nowell, P. J. Egan and J. M. Dransfield, Thermochim. Acta, 145 (1989) 203.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. School of Natural Sciences, Hatfield Polytechnic, AL10 9AB, Hatfield, Hertfordshire, UK

    B. E. I. Abdelrazig, S. D. Main & D. V. Nowell

  2. CPTC, W. R. Grace & Co., Ajax Avenue, Sl1 4BH, Slough, Berks, UK

    B. E. I. Abdelrazig

Authors
  1. B. E. I. Abdelrazig
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. S. D. Main
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. D. V. Nowell
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Abdelrazig, B.E.I., Main, S.D. & Nowell, D.V. Hydration studies of modified OPC pastes by differential scanning calorimetry and thermogravimetry. Journal of Thermal Analysis 38, 495–504 (1992). https://doi.org/10.1007/BF01915514

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01915514

Keywords

Search

Navigation