The steel–concrete interface

Title

The steel–concrete interface

 Author

Angst, Ueli M. (ETH Zürich)
Geiker, Mette R. (Norwegian University of Science and Technology (NTNU); Technical University of Denmark)
Michel, Alexander (Technical University of Denmark)
Gehlen, Christoph (Technische Universität München)
Wong, Hong (Imperial College London)
Isgor, O. Burkan (Oregon State University)
Elsener, Bernhard (ETH Zürich)
Hansson, Carolyn M. (University of Waterloo)
François, Raoul (Université de Toulouse)
Hornbostel, Karla (Norwegian University of Science and Technology (NTNU))
Polder, R.B. (TU Delft Materials and Environment; TNO)
Alonso, Maria Cruz (Institute of Construction Science Eduardo Torroja-CSIC)
Sanchez, Mercedes (Institute of Construction Science Eduardo Torroja-CSIC)
Correia, Maria João (National Laboratory of Civil Engineering (LNEC))
Criado, Maria (University of Sheffield)
Sagüés, A. (University of South Florida Tampa)
Buenfeld, Nick (Imperial College London)

Date

2017-04-01

 Abstract

Although the steel–concrete interface (SCI) is widely recognized to influence the durability of reinforced concrete, a systematic overview and detailed documentation of the various aspects of the SCI are lacking. In this paper, we compiled a comprehensive list of possible local characteristics at the SCI and reviewed available information regarding their properties as well as their occurrence in engineering structures and in the laboratory. Given the complexity of the SCI, we suggested a systematic approach to describe it in terms of local characteristics and their physical and chemical properties. It was found that the SCI exhibits significant spatial inhomogeneity along and around as well as perpendicular to the reinforcing steel. The SCI can differ strongly between different engineering structures and also between different members within a structure; particular differences are expected between structures built before and after the 1970/1980s. A single SCI representing all on-site conditions does not exist. Additionally, SCIs in common laboratory-made specimens exhibit significant differences compared to engineering structures. Thus, results from laboratory studies and from practical experience should be applied to engineering structures with caution. Finally, recommendations for further research are made.


 Subject

Corrosion
Durability
Inhomogeneity
Interfacial transition zone
Steel–concrete interface
Variability

 To reference this document use:

http://resolver.tudelft.nl/uuid:5001703d-219c-45bb-8695-c026373af7a4

 DOI

https://doi.org/10.1617/s11527-017-1010-1

 ISSN

1359-5997

 Source

Materials and Structures, 50 (2)

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2017 Ueli M. Angst, Mette R. Geiker, Alexander Michel, Christoph Gehlen, Hong Wong, O. Burkan Isgor, Bernhard Elsener, Carolyn M. Hansson, Raoul François, Karla Hornbostel, R.B. Polder, Maria Cruz Alonso, Mercedes Sanchez, Maria João Correia, Maria Criado, A. Sagüés, Nick Buenfeld
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