Influence of chloride and moisture content on steel rebar corrosion in concrete
(2016) In Materials and Corrosion 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.
(Less)
- author
- Ahlström, J. LU ; Tidblad, J. ; Sederholm, B. and Wadsö, L. LU
- organization
- publishing date
- 2016-10-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- chloride, concrete, corrosion, moisture, steel
- in
- Materials and Corrosion
- volume
- 67
- issue
- 10
- pages
- 10 pages
- publisher
- John Wiley & Sons Inc.
- 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
- 2024-04-05 09:11:33
@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}},
keywords = {{chloride; concrete; corrosion; moisture; steel}},
language = {{eng}},
month = {{10}},
number = {{10}},
pages = {{1049--1058}},
publisher = {{John Wiley & Sons Inc.}},
series = {{Materials and Corrosion}},
title = {{Influence of chloride and moisture content on steel rebar corrosion in concrete}},
url = {{http://dx.doi.org/10.1002/maco.201508799}},
doi = {{10.1002/maco.201508799}},
volume = {{67}},
year = {{2016}},
}