Abstract
This paper describes the use of the Stiffness Damage Test (SDT) technique for quantifying the degree of deterioration experienced by thermally loaded concretes. The applicability of the SDT for assessing temperature damaged concrete has been experimentally investigated and analysed. Results have shown the SDT parameters to be sensitive to the influences of test age, the level of temperature exposure and the degree of damage caused by that exposure. A strong and consistent degree of correlation between the results obtained from the SDT and the standard test measurements (compressive strength, static modulus and ultrasonic pulse velocity) has been found. The use of the SDT as a tool for detecting pre-damage and the development of microcracking in concrete specimens subjected to compressive loading have been confirmed by Acoustic Emission (AE) test techniques.
Résumé
Cet article décrit l’utilisation d’une technique, le test de rigidité (Stiffness Damage Test, SDT), permettant de quantifier le degré de détérioration des bétons soumis à des charges thermiques. Le test SDT a été expérimenté et analysé afin d’en évaluer l’application pour les dommages thermiques des bétons. Les résultats ont montré que le test est sensible à l’influence de l’âge du test, du niveau de température et du degré d’endommagement causé par la température. Une forte corrélation a été observée entre les résultats obtenus par le test SDT et ceux, issus de tests standards (force de compression, module statique et vitesse de vibration ultrasonique). L’utilisation de la technique SDT comme outil prédictif pour la détection avant endommagement et le développement de microfissures dans les échantillons de béton soumis à compression ont été confirmés par des tests d’émission acoustique.
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Guo, J.S., Waldron, P. Development of the stiffness damage test (SDT) for characterisation of thermally loaded concrete. Mat. Struct. 33, 483–491 (2000). https://doi.org/10.1007/BF02480525
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DOI: https://doi.org/10.1007/BF02480525