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23. Thick corrosion layers in reinforced concrete: characterization and properties - a review



Title: 23. Thick corrosion layers in reinforced concrete: characterization and properties - a review
Author(s): D. Neff, P. Dillmann, E. Burger, A. Demoulin, V. L'Hostis
Paper category : conference
Book title: NUCPERF 2009 - Long Term Performance of Cementitious Barriers and Reinforced Concrete in Nuclear Power Plants and Waste Management
Editor(s): V. L'Hostis, R. Gens, C. Gallé
Print-ISBN: 978-2-35158-072-1
e-ISBN: 978-2-35158-087-5
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 213 - 219
Total Pages: 7
Nb references: 23
Language: English


Abstract: This short review sums up different studies dealing with the characterisation of thick layers formed during long term corrosion of low alloy steel rebars in reinforced concrete. The first kind of layer formed during the manufacturing of the layer. This millscale is constituted by high temperature corrosion phases as wustite, hematite and magnetite. Other studies evidenced phases that could form during the first period after embedding when the pH of the environment is relatively high. The constitutive phases of such layers are magnetite and maghemite. Then, after a long corrosion period and modification of the environment (pH decrease due to carbonation), other corrosion processes take place and oxyhydroxides forms in the system leading to a complex multiphased thick layer. The physico-chemical properties (porosity, conductivity) and the reactivity of the constitutive phases of such layers could control the corrosion kinetics and it appears that such aspect must be finely studied in the future.


Online publication: 2009-11-16
Publication type : full_text
Public price (Euros): 0.00