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Experimental investigation and analytical modelling of the roughness and bonding agent influence on the old-to-repair concrete interfacial bonding strength

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Abstract

The repair of existing reinforced concrete elements is mainly realized by overlaying them with a higher strength concrete layer strengthened with reinforcement, known as jacketing. The efficiency of the method is based on the stress transfer and strain compatibility at the interface. The common methods used on-site to enhance the concrete-to-concrete bond is roughening the surface and/or applying a bonding agent layer on the old concrete surface. The purpose of this research is to evaluate the contribution of roughness and bonding agent on the bonding strength and, additionally, to develop a general predictive model. Thus, three different levels of roughness were materialized: (i) left-as-cast, (ii) wire-brushed and, (iii) splitting-fractured while two modes of adhesion were tested: (i) substrate with repair cement paste and, (ii) use of a bonding agent. Bi-surface symmetrical shear tests were carried out to assess the ultimate bonding strength of specimens with properties usually found in situ. The experimental results showed that an increase of roughness leads to a better bond performance. The bonding agent effect, however, was notable only for the left-as-cast specimens. A physically-based model is proposed to predict the shear bonding strength concerning the surface roughness, as well as the old and repair concrete’s properties. The model aims to offer to designers and researchers an accurate tool to evaluate the effectiveness of the interfacial bond in renovation jacketing procedures.

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Authors and Affiliations

  1. Laboratory of Building Materials, Department of Civil Engineering, Aristotle University of Thessaloniki, GR-54124, Thessaloniki, Greece

    Vasileios G. Apostolinas, Kyriaki S. Galopoulou & Eleftherios K. Anastasiou

  2. Laboratory of Engineering Mechanics, School of Civil Engineering, Aristotle University of Thessaloniki, GR-54124, Thessaloniki, Greece

    Leonidas Alexandros S. Kouris & Avraam A. Konstantinidis

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  1. Vasileios G. Apostolinas
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  2. Kyriaki S. Galopoulou
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  3. Leonidas Alexandros S. Kouris
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Correspondence to Leonidas Alexandros S. Kouris.

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The original online version of this article was revised: The original article was inadvertedly published containing a mistake in Equation 4. The name of the second author should read Kyriaki S. Galopoulo.

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Apostolinas, V.G., Galopoulou, K.S., Kouris, L.A.S. et al. Experimental investigation and analytical modelling of the roughness and bonding agent influence on the old-to-repair concrete interfacial bonding strength. Mater Struct 55, 148 (2022). https://doi.org/10.1617/s11527-022-01984-y

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