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        Assessing the quality of concrete – reinforcement interface in Self Compacting Concrete

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        Top_bar_effect_Manuscript_REVISED.pdf (PDF, 985Kb)
        Author
        Kanellopoulos, Antonios
        Savva, Pericles
        Petrou, Michael F.
        Ioannou, Ioannis
        Pantazopoulou, Stavroula
        Attention
        2299/22455
        Abstract
        Research has shown that even self-compacting concrete (SCC) mixtures can exhibit the so-called “top-bar effect” which impacts bond and anchorage. Several instances of conflicting results have nevertheless been published regarding interfacial bond between self-compacting concrete and steel reinforcement. The scope of this paper is to present an experimental methodology for assessing the quality of the interface between self-compacting concrete and ribbed reinforcement. For this purpose, seven different self-compacting and four normally vibrated concrete (NVC) mixtures with diverse rheological characteristics were examined. Digital Image Analysis of cut sections containing reinforcing bars at different cast-heights was used as a diagnostic tool. The study illustrates that the quality of the interface is strongly affected by the viscosity of the SCC mixtures and by the slump values in NVC. Self-compacting concrete mixtures show greater inherent robustness and cohesion at the steel–concrete interface compared to conventionally vibrated concretes.
        Publication date
        2020-04-20
        Published in
        Construction and Building Materials
        Published version
        https://doi.org/10.1016/j.conbuildmat.2019.117933
        Other links
        http://hdl.handle.net/2299/22455
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