Abstract
Cracks in freshly cast structures can be the consequence of restrained thermal deformations. Additional to these deformations high strength concrete undergoes autogenous deformations which make this material even more prone to early-age cracking.
In order to analyse this behaviour of reinforced concrete structures at early age, an elaborate test series on a high strength concrete (w/c=0.33) was performed. The measured values are: the free deformation of plain and reinforced concrete, stress development in a fully restrained reinforced specimen and in its reinforcement bars, development of bond strength and cube compressive strength.
In this paper the experimental results are presented and related to each other. With this information more knowledge is gained concerning the mechanisms leading to stress development and cracking behaviour in reinforced concrete at very early age.
Résumé
Des fissures dans des structures fraîchement moulées peuvent être la conséquence de déformations thermiques internes. En plus de ces déformations, le béton à haute résistance subit des déformations endogènes qui rendent le matériau encore plus sensible aux déformations au jeune âge.
Dans le but d'analyser le comportement de ces structures en béton armé au jeune âge, une série d'essais élaborés sur un béton à haute résistance (e/c=0,33) a été effectuée. Les valeurs mesurées sont: la déformation libre du béton armé et massif, le développement des contraintes dans un échantillon renforcé entièrement encastré et dans ses armatures, le développement de la contrainte d'adhérence et la résistance à la compression sur cube.
Cet article présente les résultats expérimentaux et les relie les uns aux autres. Cette information fait avancer la connaissance en ce qui concerne les mécanismes menant au développement des contraintes et le comportement de fissuration dans du béton armé au tout jeune âge.
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Editorial Note This paper was presented at the International RILEM Workshop on Shrinkage of Concrete
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Sule, M., van Breugel, K. Cracking behaviour of reinforced concrete subjected to early-age shrinkage. Mat. Struct. 34, 284–292 (2001). https://doi.org/10.1007/BF02482208
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DOI: https://doi.org/10.1007/BF02482208