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Tensile bond testing of concrete repairs

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Abstract

The development and maintenance of a sound band is an essential requirement of a concrete patch repair. Tensile bond tests are increasing in popularity as a means of measuring this adhesive property, both on site for quality control and in the laboratory for materials evaluation. This paper discusses the main issues relevant to tensile bond testing, namely material properties, surface conditions, geometry, loading and the effects of material mismatch. Analytical and experimental work is presented, along with the results of other researchers, with an emphasis on the core pull-off technique. The latter is shown to be a good method for evaluating bond strength provided that appropriate precautions are taken to minimize the influence of flaws and stress concentrations, and that the effects of mismatch in repair and substrate properties (particularly modulus, shrinkage and thermal expansion) are fully understood.

Resume

Le développement et la maintenance d'un joint sain constituent une nécessité vitale dans le cas d'une pièce de réparation en béton. Les essais de joints en traction connaissent une popularité croissante en tant que moyen de mesure des propriétés adhésives, à la fois sur site en tant que contrôle qualité, et en laboratoire afin d'évaluer les capacités des matériaux. Cet article aborde les principaux domaines ayant trait aux essais de joints en traction, c'est à dire les propriétés des matériaux, les conditions de surface, la géométrie, la charge et les effets de mauvaises combinaisons des matériaux. On présente les résultats de travaux analytiques et expérimentaux, avec en parallèle ceux d'autres chercheurs, en insistant sur les bases de la technique de traction. On montre que cette dernière constitue une bonne méthode pour l'évaluation de la résistance d'un joint pourvu que (i) des précautions adéquates soient prises pour minimiser l'influence des défauts et des concentrations d'efforts; et (ii) les effets de mauvaises combinaisons de matériaux en cas de réparation et les propriétés du substrat (en particulier, le coefficient d'élasticité, la contraction et la dilatation) soient pleinement comprise.

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Authors and Affiliations

  1. Structures and Materials Research Group, Department of Civil Engineering, Loughborough University of Technology, LE11 3TU, Loughborough, UK

    Simon Austin, Peter Robins & Youguang Pan

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  1. Simon Austin
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  2. Peter Robins
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  3. Youguang Pan
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Austin, S., Robins, P. & Pan, Y. Tensile bond testing of concrete repairs. Materials and Structures 28, 249–259 (1995). https://doi.org/10.1007/BF02473259

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