Abstract
A good bond between old and new concrete is necessary for a successful repair of concrete structures. The bond is usually determined through pure tension tests,e.g., the common pull off test. However, in most applications, the shear bond strength is more interested. A test apparatus for torsion tests has been developed. Laboratory and field tests have been carried out on cast in place concrete and shotcrete repairs. For waterjetted surfaces, the obtained shear bond strength exceeds 3 MPa,i.e., considerably more than the tensile bond strength which usually varies between 1 and 2 MPa. The shear bond strength is also markedly higher than design strength values found in international codes.
Résumé
Une bonne adhérence entre l'ancien béton et le nouveau est nécessaire à la réussite de la réparation des structures en béton. L'adhérence est habituellement déterminée à partir d'essais en traction pure, comme par exemple un essai classique d'adhérence. Cependant, pour la plupart des applications, la résistance au cisaillement de l'adhérence est un problème plus pertinent. Un équipement pour des essais de torsion a été développé. Des tests en laboratoire et sur site, concernant du béton coulé sur place et du béton projeté, ont été menés. Pour les surfaces traitées par hydrodémolition, la résistance au cisaillement de l'adhérence dépasse 3 MPa, ce qui est largement supérieur à la résistance à la traction, qui varie habituellement entre 1 et 2 MPa. Ainsi, la résistance au cisaillement de l'adhérence est sensiblement plus élevée que les valeurs préconsisées par les codes internationaux.
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Editorial note Prof. J. Silfwerbrand is a RILEM Senior Member. He is the Director of the Swedish Cement and Concrete Research Institute, a RILEM Titular Member.
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Silfwerbrand, J. Shear bond strength in repaired concrete structures. Mat. Struct. 36, 419–424 (2003). https://doi.org/10.1007/BF02481068
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DOI: https://doi.org/10.1007/BF02481068