CHLORIDE CONTENTS AT THE CONCRETE-STEEL INTERFACE
Paper in proceeding, 2010
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.
SEM-EDS
Interface
LA-ICP-MS
Corrosion
Chloride
Author
Nelson Dias Ferreira Da Silva
Chalmers, Civil and Environmental Engineering, Building Technology
Luping Tang
Chalmers, Civil and Environmental Engineering, Building Technology
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
275-284
978-4-8329-0360-9 (ISBN)
Areas of Advance
Building Futures (2010-2018)
Materials Science
Subject Categories
Other Materials Engineering
Other Civil Engineering
ISBN
978-4-8329-0360-9