The steel concrete interface
Autor
Angst, Ueli M.
Geiker, Mette R.
Michel, Alexander
Gehlen, Christoph
Wong, Hong
Isgor. O. Burkan
Elsener. Bernhard
Hansson, Carolyn M.
Francois, Raoul
Hornbostel. Karla
Polder. Rob
Alonso, María Cruz
Sánchez Moreno, Mercedes
Correia. Maria Joao
Criado, María
Sagüés, A.
Buenfeld, Nick
Fecha
2017Materia
Steel–concrete interface, Interfacial transition zone, Durability, Corrosion, Inhomogeneity, VariabilityInterfacial transition zone
Durability
Corrosion
Inhomogeneity
Variability
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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.