Corrosion induced cover cracking studied by X-ray computed tomography, nanoindentation, and energy dispersive X-ray spectrometry (EDS)

In this study, several experimental techniques are utilized to study different aspects of cracking of the protective cover due to reinforcing steel corrosion. Firstly, micro-computed X-ray tomography technique (CT-scanning) is used for monitoring rust formation during accelerated corrosion of reinfo...

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Bibliographic Details
Published in:Materials and structures 2015-07, Vol.48 (7), p.2043-2062
Main Authors: Šavija, Branko, Luković, Mladena, Hosseini, Seyed Amir Sajjad, Pacheco, José, Schlangen, Erik
Format: Article
Language:English
Subjects:
Building Materials
Cements
Civil Engineering
Corrosion
Corrosion tests
Engineering
Machines
Manufacturing
Materials Science
Mathematical models
Nanoindentation
Original Article
Processes
Rusting
Solid Mechanics
Stress corrosion cracking
Theoretical and Applied Mechanics
X-rays
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Summary:In this study, several experimental techniques are utilized to study different aspects of cracking of the protective cover due to reinforcing steel corrosion. Firstly, micro-computed X-ray tomography technique (CT-scanning) is used for monitoring rust formation during accelerated corrosion of reinforcement, and subsequent cover cracking. Secondly, the nanoindentation technique is employed to determine mechanical properties of the rust layer, which is an important input parameter for numerical models. Finally, energy dispersive X-ray spectrometry is used for elemental mapping around the steel–cement paste interface. Also, as a part of the study, the resistance of a strain hardening cementitious composite (SHCC) to corrosion induced cover cracking is examined. It was found that CT-scanning can be successfully utilized in non-destructive monitoring of the corrosion process in reinforced specimens. The nanoindentation study showed that the Young modulus of rust is highly dependent on the level of confinement provided to the rust layer by the surrounding cement paste. And, finally, SHCC proved to be an excellent alternative to brittle cementitious materials when corrosion induced cracking of the cover is a concern.
ISSN:1359-5997
1871-6873
DOI:10.1617/s11527-014-0292-9