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CHLORIDE CONTENTS AT THE CONCRETE-STEEL INTERFACE

Nelson Silva (Institutionen för bygg- och miljöteknik, Byggnadsteknologi) ; Luping Tang (Institutionen för bygg- och miljöteknik, Byggnadsteknologi) ; Jan Erik Lindqvist ; Dimitrios Boubitsas
Advances in Concrete Strutural Durability - Proceedings of the 2nd International Conference on Durability of Concrete Structures ICDCS2010, 24-26 November 2010, Hokkaido University, Sapporo, Japan, edited by Hiroshi Yokota, Takafumi Sugiyama and Tamon Ueda, Hokkaido University Press p. 275-284. (2010)
[Konferensbidrag, refereegranskat]

The composition and microstructure of the concrete-steel interface influences the critical chloride content (Ccr) for initiation of pitting corrosion and can differ from the conditions in the bulk concrete. This paper describes the development of a methodology for chloride profiling along the interface by means of LA-ICP-MS. SEM-EDS and XRD techniques were used for semi-quantitative analysis of Ccr, microstructure characterization of the pitting positions and distribution and composition of the corrosion products. A range of chloride levels along the interface was measured by means of LA-ICP-MS showing good agreement with the results from EDS analysis. A number of interface defects were found to influence pitting corrosion. Several Fe(III) oxy-hydroxides, including akaganeite, were identified. XRD analysis suggested the existence of FeCl2. These corrosion products tended to accumulate at the aggregate-paste interface and in air voids at the cement paste.

Nyckelord: Interface, LA-ICP-MS, SEM-EDS, Chloride, Corrosion



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Denna post skapades 2010-12-09.
CPL Pubid: 130480