Chloride profiles along the concrete-steel interface

Dias Ferreira Da Silva, Nelson,1978Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden (author)

The composition and microstructure of the concrete-steelinterface 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 wereemployed. 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 foundbetween 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 cementpaste. XRD analysis suggested the presence of akaganeite and FeCl2 (rokuhnite).

Tang, Luping,1956Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden(Swepub:cth)vbmtl (author)
Lindqvist, Jan ErikRISE,CBI Betonginstitutet AB (author)
Boubitsas, DimitriosRISE,CBI Betonginstitutet AB (author)
Chalmers tekniska högskolaChalmers University of Technology, Sweden (creator_code:org_t)

In:International Journal of Structural Engineering4:1/2, s. 100-1121758-73281758-7336

By the author/editor: Dias Ferreira Da ...; Tang, Luping, 19 ...; Lindqvist, Jan E ...; Boubitsas, Dimit ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Civil Engineerin ...; and Infrastructure E ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Other Materials ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Civil Engineerin ...; and Building Technol ...

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