Abstract
Restrained shrinkage tests of fresh concrete using conventional ring specimens with a steel core are sometimes not effective because of their relatively low cracking sensitivity. Modified ring specimens with a Perspex core having a high coefficient of thermal expansion were developed with the object of obtaining a test method which can provide cracking sensitivity results within a short time. An analysis of stress distribution is presented, taking into account the geometry and elasticity characteristics of the ring and core in specimens subjected to restrained shrinkage and heating. For tests of fresh plain and fibre-reinforced concretes, a Perspex core with additional stress concentrators (wedges) was used.
Resume
Les essais de retrait empêché du béton frais réases sur des éprouvettes annulaires conventionnelles avec un noyau d'acier sont parfois peu probants du fait d'une scresibilité à la fissuration relativement faible. On a fabrigre des éprouvettes modifiées dont le noyau en Perspex presente un coefficient élevé de dilatation thermique, afin d'obtenir une méthode d'essai capable de fournir des résultats sur la sensibilité à la fissuration. On présente une analyse de la répartition des contraintes qui prend en compte la géométrie et les caractéristiques élastiques de l'anneau et du noyau dans les éprouvettes soumises au retrait empêché et à l'élévation de température. Pour les essais de béton frais ordinaire et renforcé de fibres, on a utilisé un noyau en Perspex avec des concentrateurs de contraintes supplémentaires.
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Kovler, K., Sikuler, J. & Bentur, A. Restrained shrinkage tests of fibre-reinforced concrete ring specimens: effect of core thermal expansion. Materials and Structures 26, 231–237 (1993). https://doi.org/10.1007/BF02472616
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DOI: https://doi.org/10.1007/BF02472616