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Østergaard, Thomas
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article
A thermal comparator sensor for measuring autogenous deformation in hardening Portland cement paste
Abstract
This paper describes a simple and accurate experimental device specially developed to measure autogenous deformation in hardening cement-based materials. The measuring system consists of a so-called thermal comparator sensor and a modular thermostatically controlled system. The operating principle of the thermal comparator is based on thermal expansion of aluminium. A particular characteristic of the measuring system is the fixation of the thermal comparator sensor to the deforming specimen. The modular system ensures effective thermostatic control of the hydrating cement paste samples. The technique allows continuous measurement with high accuracy of the linear deformation as well as determination of the activation energy of autogenous deformation.