Abstract
The influence of thermal curing on the evolution of the material properties and the UHPFRC behaviour was investigated. Tests results showed a beneficial effect of a high temperature curing on the early age material properties due to the thermo-activation effect on the hydration process. However, an inverse effect was observed at long-term. In our study, activation energy of UHPFRC was evaluated from experimental data by means of empirical models. The traditional maturity-function based on Arrhenius law, generally used to describe thermally activated physical or chemical processes, was used to predict the evolution of the UHPFRC autogenous shrinkage and to validate the applicability of this concept for such cement-based materials. Results showed that the concept based on Arrhenius law could describe correctly temperature effects on UHPFRC for temperature lower than 30°C.
Résumé
L’influence de la cure thermique sur l’évolution des propriétés et du comportement du Béton Fibré Ultra Performant (BFUP) a été étudiée. Les résultats d’essais ont montré l’effet bénéfique des températures élevées sur les propriétés du matériau au jeune âge à cause de la thermo-activation du processus d’hydratation. Néanmoins, un effet inverse a été observé à long terme. Dans cette étude, l’énergie d’activation du BFUP a été évaluée à partir des résultats expérimentaux par le biais de modèles empiriques. Le concept de maturité traditionnel basé sur la loi d’Arrhenius, généralement utilisé pour décrire l’activation thermique des processus physiques et chimiques, a été utilisé pour prédire l’évolution du retrait endogène du BFUP et pour valider l’application de ce concept pour de tels matériaux cimentaires. Les résultats ont montré que le concept basé sur la loi d’Arrhenius décrit correctement l’effet thermique sur le BFUP pour des températures inférieures à 30°C.
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Acknowledgments
This project was financially supported by the Swiss National Science Foundation and by the Swiss Federal Office for Education and Science in the context of the European project “Sustainable and Advanced Materials for Road Infrastructures” (SAMARIS).
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Kamen, A., Denarié, E., Sadouki, H. et al. Evaluation of UHPFRC activation energy using empirical models. Mater Struct 42, 527–537 (2009). https://doi.org/10.1617/s11527-008-9400-z
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DOI: https://doi.org/10.1617/s11527-008-9400-z