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Effect of a heating–cooling cycle on elastic strain and Young’s modulus of high performance and ordinary concrete

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Abstract

In this paper, the variations of elastic strain and Young modulus of high performance concrete and ordinary concrete during a heating–cooling cycle is presented. For the HPC, two heating rates are applied: 1.5 and 0.1 °C/min corresponding respectively to accidental and service conditions. For ordinary concrete, the results of service conditions are given. The temperatures of 400 and 220 °C are the heating’s final temperature phase of the accidental and service conditions respectively. The present work analyses the differences between the value of the elastic strain and the Young’s modulus at the beginning of the test (at ambient temperature), the end of the heating part and the end of the cooling part of each variation. Indeed, during the heating phase, the corresponding heating rates are applied until successive constant temperature levels are achieved: 150, 200, 300 and 400 °C for the high-performance concrete under accidental conditions and 140, 190 and 220 °C for both high-performance and ordinary concrete under service conditions. Those applied temperatures are maintained for several hours to ensure the stabilisation of internal temperature and physico-chemical thermo dependent processes. Moreover, the influence of the difference in mix concretes between the two types of concretes and the heating rate influence on those variations is also presented.

Résumé

Dans cet article, les variations de la déformation élastique et du module d’Young du béton à haute performance (BHP) et du béton ordinaire (BO) au cours d’un cycle de chauffage refroidissement est présenté. Pour le BHP, deux taux de chauffage sont appliqués: 1.5 et 0.1 °C/min, correspondant respectivement aux conditions accidentelles et de service. Pour le béton ordinaire, les résultats de conditions de service sont donnés. Les températures de 400 et 220 °C sont les températures finales de la phase de chauffage pour les conditions accidentelles et de service, respectivement. Une étude comparative entre la valeur de la déformation élastique et le module de Young au début de l’essai (à température ambiante), à la fin de la partie de chauffage et la fin de la partie de refroidissement de chaque variation est réalisée. En effet, au cours de la phase de chauffage, les taux de chauffage correspondants sont appliques jusqu’à des plateaux de températures : 150, 200, 300 et 400 °C pour le béton à haute performance sous des conditions accidentelles et 140, 190 et 220 °C pour les deux bétons (haute performance et ordinaire) sous des conditions de service. Les températures appliquées sont maintenues pendant plusieurs heures pour assurer la stabilisation de la température interne et les processus thermo-physico-chimiques. En outre, l’influence de la différence dans les compositions de bétons entre les deux types de bétons et de l’influence de la vitesse de chauffage sur ces variations est également présentée.

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Acknowledgments

This work was undertaken with co-operation between the Laboratory of Mechanic (LAM), UMLV and the Laboratory of Material Analysis and Identification (LAMI), ENPC-LCPC joint laboratory, two laboratories of the Institut Navier.

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Authors and Affiliations

  1. Laboratory of Civil Engineering, BP 37 Le Belvédère, 1002, Tunis, Tunisia

    Sabeur Hassen

  2. ATILH, 7 place de la Défense, 92974, Paris-La-Défense Cedex, France

    Horacio Colina

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  1. Sabeur Hassen
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  2. Horacio Colina
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Correspondence to Sabeur Hassen.

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Hassen, S., Colina, H. Effect of a heating–cooling cycle on elastic strain and Young’s modulus of high performance and ordinary concrete. Mater Struct 45, 1861–1875 (2012). https://doi.org/10.1617/s11527-012-9875-5

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  • DOI: https://doi.org/10.1617/s11527-012-9875-5

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