CHLORIDE CONTENTS AT THE CONCRETE-STEEL INTERFACE

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

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Annan materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Other Materials Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Annan samhällsbyggnadsteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Other Civil Engineering (hsv//eng)

Nyckelord

SEM-EDS

Interface

LA-ICP-MS

Corrosion

Chloride

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