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Chloride profiles along 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
International Journal of Structural Engineering (1758-7328). Vol. 4 (2013), 1/2, p. 100-112.
[Artikel, refereegranskad vetenskaplig]

The composition and microstructure of the concrete-steel interface influences the critical chloride content for initiation of pitting corrosion and these characteristics may differ from those of the bulk concrete. This paper describes the development of a methodology for chloride profiling along the interface by means of LA-ICP-MS. For semi-quantitative analysis, microstructure characterisation of the pitting positions and distribution and composition of the corrosion products, SEM-EDS and XRD techniques were employed. The results indicate that along the interface a range of chloride levels can be expected. These varied between 0.15–1.5 wt% of concrete with higher levels around the active corrosion sites. Good agreement has been found between the results from LA-ICP-MS and EDS techniques. Interface defects strongly influenced the pitting corrosion. Several Fe(III) oxy-hydroxides accumulated at the aggregate-paste interface and in air voids at the cement paste. XRD analysis suggested the presence of akaganeite and FeCl2 (rokuhnite).

Nyckelord: concrete-steel interface; LA-ICP-MS; SEM-EDS; chloride



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Denna post skapades 2014-01-08. Senast ändrad 2017-03-21.
CPL Pubid: 191779

 

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Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Byggnadsteknologi (2005-2017)

Ämnesområden

Building Futures
Materialvetenskap
Husbyggnad
Infrastrukturteknik
Konstruktionsmaterial

Chalmers infrastruktur