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Simultaneous measurements of heat of hydration and chemical shrinkage on hardening cement pastes

Lura, Pietro ; Winnefeld, Frank ; Klemm, Stefanie

In: Journal of Thermal Analysis and Calorimetry, 2010, vol. 101, no. 3, p. 925-932

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    Titre
    • Simultaneous measurements of heat of hydration and chemical shrinkage on hardening cement pastes
    Auteur
    • Lura, Pietro. Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Concrete and Construction Chemistry, Überlandstrasse 129, 8600, Dübendorf, Switzerland
    • Winnefeld, Frank. Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Concrete and Construction Chemistry, Überlandstrasse 129, 8600, Dübendorf, Switzerland
    • Klemm, Stefanie. Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Concrete and Construction Chemistry, Überlandstrasse 129, 8600, Dübendorf, Switzerland
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Journal of Thermal Analysis and Calorimetry, 2010, vol. 101, no. 3, p. 925-932. Springer Netherlands
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:318498
    Summary
    Isothermal calorimetry and chemical shrinkage measurements are two independent techniques used to study the development of hydration in cementitious systems. In this study, calorimetry and chemical shrinkage measurements were combined and simultaneously performed on hydrating cement paste samples. Portland cement pastes with different water to cement ratios and a cement paste containing calcium sulfoaluminate clinker and anhydrite were studied. The combined calorimetry/chemical shrinkage test showed good reproducibility and revealed the different hydration behavior of sealed samples and open samples, i.e., samples exposed to external water during hydration. Large differences between sealed and open samples were observed in a Portland cement paste with low water to cement ratio and in the calcium sulfoaluminate paste; these effects are attributed to self-desiccation of the sealed pastes. Once the setup is fully automatized, it is expected that combined calorimetry/chemical shrinkage measurements can be routinely used for investigating cement hydration