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Influence of pre-existing oxides layer and interface condition with carbonated concrete on active reinforcing steel corrosion

Abstract : This work focuses on carbonation-induced corrosion in concrete. This paper presents specific experiments which were developed in order to assess the influence of both pre-existing oxides layer at the surface of the steel bars and steel-concrete interface condition on active corrosion. Two types of active corrosion are studied: Microcell corrosion and galvanic corrosion. Results show that pre-existing oxide layer contributes to reduce both galvanic and microcell corrosion. Steel-concrete interface defect leads to a strong increase in galvanic corrosion but does not affect significantly microcell corrosion in carbonated concrete. The quantity of pre-existing oxides is highly scattered and these scatters can be superior to the mass of new oxides formed during relatively short-term corrosion tests in natural condition which makes mass loss analysis very difficult.
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https://hal.insa-toulouse.fr/hal-01849769
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Submitted on : Thursday, July 26, 2018 - 2:42:14 PM
Last modification on : Friday, January 10, 2020 - 9:09:32 PM

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A. Castel, A. Nasser. Influence of pre-existing oxides layer and interface condition with carbonated concrete on active reinforcing steel corrosion. Materials and Corrosion / Werkstoffe und Korrosion, Wiley-VCH Verlag, 2015, 66 (3), pp.206--214. ⟨10.1002/maco.201307195⟩. ⟨hal-01849769⟩

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