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Towards a harmonised European bond test

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Abstract

Bond influences several aspects of structural performance. Standard methods of bond test currently specified were developed over 30 years ago. During this time understanding of the phenomenon of bond between reinforcement and concrete and of the factors which influence it has expanded greatly. An overview of the current knowledge and needs demonstrates that a reappraisal of standard bond tests is now necessary.

The paper outlines the principals that should underpin a bond test specification derived from considerations of the manner in which bond influences structural performance. It is demonstrated that a single measure of performance is inadequate, and develops proposals for a system of testing in which several measures can be used to classify each aspect of structural performance. A development length form of test with the bar in tension is selected, with low confinement from concrete cover and transverse reinforcement.

The proposal is developed to a conceptual stage in the present paper. Following consultation with interested parties, the Authors propose to develop a detailed specification.

Résumé

L'adhérence entre le béton et l'armature influence bien des aspects du comportement structurel, au point que l'on a développé beaucoup des méthodes standardisées pour la mesure de l'adhérence pendant ces trente dernières années. En même temps, l'intelligence de la nature de l'adhérence entre le béton et l'armature, et des facteurs qui l'influencent, a fait d'extraordinaires pas en avant: une réflexion sur l'état des connaissances et sur les nécessités de développement montre qu'un revirement au sujet des essais standardisés sur l'adhérence ne peut être différé.

Dans ce contexte, on présente ici les principes sur lesquels on devrait fonder les spécifications pour les essais sur l'adhérence, compte tenu des effets qu'elle a sur le comportement structurel. On montre qu'une unique mesure des performances est insuffisante, et que le développement d'un système d'essais, avec la possibilité de mesurer plusieurs performances structurelles de l'adhérence et de les classer, est désormais nécessaire. On propose un essai basé sur le même principe que celui qui gouverne les essais concernant le bout terminal d'une poutre fléchie (beam-end test), avec un confinement relativement bas, exercé par le recouvrement en béton et par les étriers.

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Abbreviations

A sv :

total area of transverse reinforcement

d b :

bar diameter

S v :

longitudinal spacing between transverse bars

References

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Authors and Affiliations

  1. School of the Built Environment, Heriot-Watt University, Edinburgh, UK

    J. Cairns

  2. Faculty of Engineering, University of Bergamo, Italy

    G. A. Plizzari

Authors
  1. J. Cairns
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  2. G. A. Plizzari
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Cairns, J., Plizzari, G.A. Towards a harmonised European bond test. Mat. Struct. 36, 498–506 (2003). https://doi.org/10.1007/BF02480826

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  • DOI: https://doi.org/10.1007/BF02480826

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