Abstract
Roller Compacted Concrete is a very dry material consolidated by the use of a powerful external vibatory compaction. This material is used mainly in gravity or arch/gravity dams, and pavements. RCC dam construction methodology, by concrete layers, involves a high number and an extensive area of horizontal joints. These joints are the weakest parts of RCC in terms of strength and permeability, being one hindrance to more widespread use of RCC. This study analyses the influence of different parameters on the direct tensile strength of the joints, namely the relative humidity in the concrete surface, the setting and hardening state of concrete, and the cold joint treatment. The results obtained indicated that the decrease in the joint quality with the time of exposure is continuous being important the compaction of the upper layer before the initial setting time of the lower layer. Cold joint treatments should expose aggregate particles.
Résumé
Le béton compacté au rouleau (BCR) est un matériau très sec, qui est consolidé moyennant l'utilisation d'un compactage externe vibratoire très puissant. Ce matériau est essentiellement utilisé pour les barrages-poids ou les barrages poids-voûte. La méthode de construction des barrages avec BCR, moyennant des couches en béton, comporte un nombre très élevé et une surface très étendue de joints horizontaux. Ces joints sont les parties les plus faibles du BCR en ce qui concerne la résistance et la perméabilité, facteur venant limiter une utilisation plus répandue du BCR. Cette étude analyse l'influence de plusieurs paramètres sur la résistance à la tension directe des joints, à savoir l'humidité relative sur la surface du béton, le temps de prise et l'état de durcissement du béton et le traitement de la reprise de bétonnage. Les résultats obtenus ont indiqué que la réduction de la qualité des joints avec le temps d'exposition est continuelle; ainsi, la couche supérieure devra être compactée avant le temps de prise de la couche inférieure. Les traitements des reprises de bétonnage devront exposer les particules des granulats.
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Editorial Note LNEC (Portuguese National Laboratory of Civil Engineering) is a RILEM Titular Member.
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Bettencourt Ribeiro, A.C., Díez-Cascón, J. & Gonçalves, A.F. Roller compacted concrete-tensile strength of horizontal joints. Mat. Struct. 34, 413–417 (2001). https://doi.org/10.1007/BF02482287
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DOI: https://doi.org/10.1007/BF02482287