Mechanical properties of the rust layer induced by impressed current method in reinforced mortar

This paper describes the mechanical effects of rust layer formed in reinforced mortar through accelerated tests of corrosion. The morphological and physico-chemical properties (composition, structures) of the corrosion system were characterized at different stages by using optical microscope and sca...

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Bibliographic Details
Published in:Cement and concrete research 2008-08, Vol.38 (8), p.1079-1091
Main Authors: Caré, S., Nguyen, Q.T., L'Hostis, V., Berthaud, Y.
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
CHEMICAL PROPERTIES
Concretes. Mortars. Grouts
CORROSION
CRACKS
Durability. Pathology. Repairing. Maintenance
Engineering Sciences
Exact sciences and technology
INTERFACES
LAYERS
Materials
MATERIALS SCIENCE
MECHANICAL PROPERTIES
Mechanics
Mechanics of materials
Metallic materials
MORTARS
OPTICAL MICROSCOPES
Physics
Reinforced concrete
Rust
SCANNING ELECTRON MICROSCOPY
SEM
SPECTROSCOPY
Steel reinforced mortar
STEELS
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Summary:This paper describes the mechanical effects of rust layer formed in reinforced mortar through accelerated tests of corrosion. The morphological and physico-chemical properties (composition, structures) of the corrosion system were characterized at different stages by using optical microscope and scanning electron microscope coupled with energy dispersive spectroscopy. The corrosion pattern was mainly characterized by a rust layer confined at the interface between the steel and the mortar. Expansion coefficient of rust products was determined from the rust thickness and the Faraday's law. Furthermore, in order to understand the mechanical effects of corrosion on the damage of mortar, displacement field measurements were obtained by using digital image correlation. An analytical model (hollow cylinder subjected to inner and outer pressures) was used with a set of experimental data to deduce the time of cracking and the order of magnitude of the mechanical properties of the rust layer.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2008.03.016