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

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Abstract

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.

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Abbreviations

OPC:

Ordinary Portland cement

CSA:

Calcium sulfoaluminate clinker

Cs:

Anhydrite

w/c:

Water to cement ratio

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Acknowledgements

This project was funded by the Nanocem consortium under the project “Studying early age reactions of cementitious pastes by an in situ combination of isothermal calorimetry with other methods”. Stimulating discussion with Lars Wadsö, Mette Geiker, Laure Pelletier and Ellis Gartner is gratefully acknowledged.

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Authors and Affiliations

  1. Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Concrete and Construction Chemistry, Überlandstrasse 129, 8600, Dübendorf, Switzerland

    Pietro Lura, Frank Winnefeld & Stefanie Klemm

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  1. Pietro Lura
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  2. Frank Winnefeld
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  3. Stefanie Klemm
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Correspondence to Pietro Lura.

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Lura, P., Winnefeld, F. & Klemm, S. Simultaneous measurements of heat of hydration and chemical shrinkage on hardening cement pastes. J Therm Anal Calorim 101, 925–932 (2010). https://doi.org/10.1007/s10973-009-0586-2

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  • DOI: https://doi.org/10.1007/s10973-009-0586-2

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