Abstract
In this paper, the variations of transient creep strain of high performance concrete, high strength concrete and ordinary concrete during a heating–cooling cycle are presented. Two heating rates are applied: 1.5 and 0.1 °C/min corresponding, respectively, to accidental and service conditions. The temperatures of 400 and 220 °C are the heating’s final temperature phase of the accidental and service conditions, respectively. Further, during the heating phase, the corresponding heating rates are applied until successive constant temperature levels are achieved: 150, 200, 300 and 400 °C under accidental conditions and 140, 190 and 220 °C under service conditions. Those applied temperatures are maintained for several hours to ensure the stabilisation of internal temperature and physico-chemical thermo-dependent processes. To study the importance of internal properties changes, especially those related to free and bound water, some specimens are submitted to a second heating cycle. Moreover, the influence of the difference in mix concretes and the influence of the heating rate are also presented.
Resumé
Dans cet article, les variations du fluage thermique transitoire du béton à haute performance, à haute résistance et d’un béton ordinaire durant un cycle de chauffage-refroidissement sont présentées ici. Deux taux de chauffage sont appliqués : 1.5 et 0.1 °C/min correspondants respectivement aux conditions accidentelles et de service. Les températures 400 et 220 °C sont les températures finales atteintes sous conditions accidentelles et de service respectivement. Outre, durant la phase de chauffage, les taux de chauffage sont appliqués jusqu’à atteindre les plateaux de températures suivant: 150, 200, 300 et 400 °C sous conditions accidentelles et 140, 190 and 220 °C sous conditions de service. Ces plateaux de température sont maintenus durant des heurs afin d’assurer la stabilisation de la température interne et les différents phénomènes physico-chimiques. Pour étudier l’importance de l’évolution des propriétés internes, et spécialement celles reliées à l’eau libre et chimiquement liée, des spécimens vont subir un deuxième cycle de chauffage. En plus, l’influence des différences dans les compostions des bétons et l’influence du taux de chargement sont aussi présentés.
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Sabeur, H., Colina, H. Effect of heating–cooling cycles on transient creep strain of high performance, high strength and ordinary concrete under service and accidental conditions. Mater Struct 48, 1561–1579 (2015). https://doi.org/10.1617/s11527-014-0254-2
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DOI: https://doi.org/10.1617/s11527-014-0254-2