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

Antonios Kanellopoulos, Pericles Savva, Michael F. Petrou, Ioannis Ioannou, Stavroula Pantazopoulou

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
41 Downloads (Pure)

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.
Original languageEnglish
Article number117933
JournalConstruction and Building Materials
Volume240
Early online date28 Dec 2019
DOIs
Publication statusPublished - 20 Apr 2020

Keywords

  • Concrete quality
  • Reinforcement-concrete interface
  • Self Compacting Concrete
  • Top-bar effect

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