CHLORIDE CONTENTS AT THE CONCRETE-STEEL INTERFACE
Paper in proceedings, 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

Areas of Advance

Building Futures (2010-2018)

Materials Science

Subject Categories

Other Materials Engineering

Other Civil Engineering

ISBN

978-4-8329-0360-9

More information

Created

10/7/2017