Critical Conditions for Depassivation of Steel in Concrete: Interface Chloride Profiles and Steel Surface Condition
Artikel i övriga tidskrifter, 2012

The composition and macrostructure of the concrete-steel interface and the surface finish of the steel are fundamental for the chloride induced corrosion initiation in reinforced concrete, with direct influence in the chloride threshold values (Cth). In this paper these characteristics were examined for vertically cast samples immersed in salt solution. After depassivation, the specimens were open for visual examination. Corrosion always initiated at the front side and surface defects were found to influence the corrosion onset. Chloride, calcium and iron profiles along the interface were drawn by means of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and higher chloride contents were measured around active corroding areas.

LA-ICP-MS

elemental distributions

steel surface condition

chloride threshold values

Steel-concrete interface

Författare

Nelson Dias Ferreira Da Silva

Chalmers, Bygg- och miljöteknik, Byggnadsteknologi

Dimitrios Boubitsas

Luping Tang

Chalmers, Bygg- och miljöteknik, Byggnadsteknologi

Jan Erik Lindqvist

Nordic Concrete Research

0800-6377 (ISSN)

Vol. 45 111-123

Ämneskategorier

Materialteknik

Samhällsbyggnadsteknik

Styrkeområden

Building Futures

Materialvetenskap

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2017-10-07