Abstract
The thermal and structural effects of elevated temperatures on the basic creep of unsealed hardened cement paste are isolated by means of an experimental scheme, involving different combinations of preheat and loading temperature in the range 300 to 635°C. The thermal effect is found to obey an Arrhenius-type rate theory, yielding bilinear Arrhenius plots. The structural effect is found to consist of a strength reduction component, which increases the creep potential, and a stabilization component, which decreases the creep potential. The percentage weight loss is found to be a suitable descriptor of the stabilization component in the above temperature range.
Résumé
On a isolé les effets thermiques et structuraux des hautes températures sur le fluage propre de la pâte de ciment durcie au moyen d'un dispositif expérimental offrant différentes combinaisons de préchauffage et de températures de chargement entre 300 et 635°C. On a constaté que l'effet thermique est conforme à la théorie d'Arrhénius, ce qu'indiquent les valeurs obtenues qui s'ordonnent selon l'équation d' Arrhénius. Quant à l'effet structural, il réside en une composante de réduction de résistance, ce qui accroît le fluage potentiel, et une composante de stabilisation qui tend à réduire celui-ci. Le pourcentage de perte de poinds montre une correspondance satisfaisante avec l'élément de stabilisation dans l'intervalle de températures cité.
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References
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Dias, W.P.S., Khoury, G.A. & Sullivan, P.J.E. The thermal and structural effects of elevated temperatures on the basic creep of hardened cement paste. Materials and Structures 23, 418–425 (1990). https://doi.org/10.1007/BF02472024
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DOI: https://doi.org/10.1007/BF02472024