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Influence of chloride and moisture content on steel rebar corrosion in concrete

Ahlström, J. LU ; Tidblad, J.; Sederholm, B. and Wadsö, L. LU (2016) In Materials and Corrosion - Werkstoffe und Korrosion 67(10). p.1049-1058
Abstract

Reinforced mortar samples were exposed in humidity chambers with different relative humidity or exposed in cyclic moisture conditions. The rebars were in an “as received” condition meaning that the preexisting oxide scale were intact. The lowest chloride concentration that initiated corrosion was 1% Cl by mass of cement, corrosion was then observed for samples exposed at 97% relative humidity. It is suggested that the corrosion rate decreases when samples are exposed to a relative humidity lower than 97%. The results indicate that threshold levels should be evaluated at rather humid conditions (97%) despite the fact that the maximum corrosion rate at higher chloride levels is observed in the interval 91–94%. For samples... (More)

Reinforced mortar samples were exposed in humidity chambers with different relative humidity or exposed in cyclic moisture conditions. The rebars were in an “as received” condition meaning that the preexisting oxide scale were intact. The lowest chloride concentration that initiated corrosion was 1% Cl by mass of cement, corrosion was then observed for samples exposed at 97% relative humidity. It is suggested that the corrosion rate decreases when samples are exposed to a relative humidity lower than 97%. The results indicate that threshold levels should be evaluated at rather humid conditions (97%) despite the fact that the maximum corrosion rate at higher chloride levels is observed in the interval 91–94%. For samples exposed to cyclic moisture conditions, a lower chloride concentration was needed to initiate corrosion compared to samples exposed in static moisture conditions.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
chloride, concrete, corrosion, moisture, steel
in
Materials and Corrosion - Werkstoffe und Korrosion
volume
67
issue
10
pages
10 pages
publisher
John Wiley & Sons
external identifiers
  • scopus:84971631278
  • wos:000385661000005
ISSN
0947-5117
DOI
10.1002/maco.201508799
language
English
LU publication?
yes
id
3b6c5dbf-28da-4794-80e7-72c2a5094296
date added to LUP
2016-11-01 09:44:36
date last changed
2017-08-06 05:12:53
@article{3b6c5dbf-28da-4794-80e7-72c2a5094296,
  abstract     = {<p>Reinforced mortar samples were exposed in humidity chambers with different relative humidity or exposed in cyclic moisture conditions. The rebars were in an “as received” condition meaning that the preexisting oxide scale were intact. The lowest chloride concentration that initiated corrosion was 1% Cl<sup>−</sup> by mass of cement, corrosion was then observed for samples exposed at 97% relative humidity. It is suggested that the corrosion rate decreases when samples are exposed to a relative humidity lower than 97%. The results indicate that threshold levels should be evaluated at rather humid conditions (97%) despite the fact that the maximum corrosion rate at higher chloride levels is observed in the interval 91–94%. For samples exposed to cyclic moisture conditions, a lower chloride concentration was needed to initiate corrosion compared to samples exposed in static moisture conditions.</p>},
  author       = {Ahlström, J. and Tidblad, J. and Sederholm, B. and Wadsö, L.},
  issn         = {0947-5117},
  keyword      = {chloride,concrete,corrosion,moisture,steel},
  language     = {eng},
  month        = {10},
  number       = {10},
  pages        = {1049--1058},
  publisher    = {John Wiley & Sons},
  series       = {Materials and Corrosion - Werkstoffe und Korrosion},
  title        = {Influence of chloride and moisture content on steel rebar corrosion in concrete},
  url          = {http://dx.doi.org/10.1002/maco.201508799},
  volume       = {67},
  year         = {2016},
}