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

Molnár, Miklós LU and Larsson, Oskar LU (2016) 16th International Brick and Block Masonry Conference In Brick and Block Masonry: Trends, Innovations and Challenges - Proceedings of the 16th International Brick and Block Masonry Conference, IBMAC 2016 p.541-546
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
brick walls, bed joint reinforcement, corrosion, cracking
in
Brick and Block Masonry: Trends, Innovations and Challenges - Proceedings of the 16th International Brick and Block Masonry Conference, IBMAC 2016
editor
Modena, C.; da Porta, F.; Valluzzi, M.R.; ; and
pages
6 pages
publisher
CRC Press/Balkema
conference name
16th International Brick and Block Masonry Conference
external identifiers
  • scopus:85016100507
ISBN
978-1-138-02999-6
DOI
10.1201/b21889-71
language
English
LU publication?
yes
id
3e65e181-71f0-494b-9a16-c26cb784e421
date added to LUP
2016-08-31 17:07:27
date last changed
2017-04-16 04:39:49
@inproceedings{3e65e181-71f0-494b-9a16-c26cb784e421,
  abstract     = {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.},
  author       = {Molnár, Miklós and Larsson, Oskar},
  booktitle    = {Brick and Block Masonry: Trends, Innovations and Challenges - Proceedings of the 16th International Brick and Block Masonry Conference, IBMAC 2016},
  editor       = {Modena, C. and da Porta, F. and Valluzzi, M.R.},
  isbn         = {978-1-138-02999-6},
  keyword      = {brick walls,bed joint reinforcement,corrosion,cracking},
  language     = {eng},
  month        = {06},
  pages        = {541--546},
  publisher    = {CRC Press/Balkema},
  title        = {Corrosion of bed joint reinforcement in faced single-leaf brick facades - field survey},
  url          = {http://dx.doi.org/10.1201/b21889-71},
  year         = {2016},
}