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Corrosion of bed joint reinforcement in faced single-leaf brick facades - field survey

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Author

Editor

  • C. Modena
  • F. da Porta
  • M.R. Valluzzi

Summary, in English

Bed joint reinforcement consisting of unprotected carbon steel was widely used to bridge windows and other openings in post-war brick buildings in the Scandinavian countries. Today, cracking caused by reinforcement corrosion constitute an increasing technical and economic problem, since removal of the corroding reinforcement can be both labour intensive and costly. Retrofitting measures are usually only based on an ocular inspection of the crack frequency, which give sub-optimal retrofitting results due to a lack of knowledge concerning the actual corrosion damage in the wall. The extent of retrofitting measures varies between partial removal of reinforcement from cracked joints to the removal of all reinforcement. This practice is problematic, since the level of retrofitting is not related, in a rational way, to the expected future development of the corrosion related damage. The objective of the presented field survey is to increase knowledge about factors influencing corrosion of bed joint reinforcement and by this provide input to development of rational decision making tools concerning retrofitting. The field survey deals with ocular examination of cracking and decay related to corrosion of reinforcement embedded in joints above windows and other openings. The field survey is complemented by examination and measurement of the corrosion depth in reinforcement collected from the field. The results show a strong dependence of crack formation on the corrosion depth of the embedded reinforcement related to differences in hygro-thermal conditions in the facade, that in turn depend on e.g. orientation, height, sheltering and the number of reinforcement bars in the bed joints.

Publishing year

2016-06-26

Language

English

Pages

541-546

Publication/Series

Brick and Block Masonry: Trends, Innovations and Challenges - Proceedings of the 16th International Brick and Block Masonry Conference, IBMAC 2016

Document type

Conference paper

Publisher

CRC Press/Balkema

Topic

  • Building Technologies

Keywords

  • brick walls
  • bed joint reinforcement
  • corrosion
  • cracking

Conference name

16th International Brick and Block Masonry Conference

Conference date

2016-06-26 - 2016-06-30

Conference place

Padova, Italy

Status

Published

ISBN/ISSN/Other

  • ISBN: 978-1-4987-9592-0
  • ISBN: 978-1-138-02999-6