Corrosion of steel in carbonated concrete: mechanisms, practical experience, and research priorities – a critical review by RILEM TC 281-CCC
Carbonation of concrete is generally assumed to lead to reinforcing steel corrosion. This mindset has long dictated the research priorities surrounding the developments towards new, low-emission binders. Here, by reviewing documented practical experience and scientific literature, we show that this...
Main Authors: | , , , , , , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
RILEM Publications SARL
2020-12-01
|
Series: | RILEM Technical Letters |
Subjects: | |
Online Access: | https://letters.rilem.net/index.php/rilem/article/view/127 |
id |
doaj-0a0918fecf864e3c8b11fdbdff883b17 |
---|---|
record_format |
Article |
spelling |
doaj-0a0918fecf864e3c8b11fdbdff883b172021-02-03T03:50:00ZengRILEM Publications SARLRILEM Technical Letters2518-02312020-12-01510.21809/rilemtechlett.2020.127Corrosion of steel in carbonated concrete: mechanisms, practical experience, and research priorities – a critical review by RILEM TC 281-CCCUeli Angst0Fabrizio MoroMette GeikerSylvia KesslerHans BeushausenCarmen AndradeJukka LahdensivuArto KöliöKei-ichi ImamotoStefanie von Greve-DierfeldMarijana SerdarETH Zurich Carbonation of concrete is generally assumed to lead to reinforcing steel corrosion. This mindset has long dictated the research priorities surrounding the developments towards new, low-emission binders. Here, by reviewing documented practical experience and scientific literature, we show that this widely held view is too simplistic. In fact, there are many cases from engineering practice where carbonation of the cementitious matrix surrounding the steel did not lead to noticeable corrosion or to corrosion-related damage at the level of a structure. The influencing factors that can, however, lead to considerable corrosion damage are identified as the moisture state, the microstructure of the carbonated concrete, various species that may be present – even in minor amounts – in the concrete pore solution, and the cover depth. The circumstance that a reduced pH alone is not sufficient to lead to significant steel corrosion in concrete seriously challenges the established approach of assessing the durability performance based on carbonation testing and modeling. At the same time, this circumstance offers great opportunities for reducing the environmental impact of concrete structures with low-emission binders. To realize these opportunities, the focus in research and engineering should shift from studying carbonation to studying corrosion of steel in carbonated concrete. https://letters.rilem.net/index.php/rilem/article/view/127carbonationcorrosiondurabilitysustainability |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ueli Angst Fabrizio Moro Mette Geiker Sylvia Kessler Hans Beushausen Carmen Andrade Jukka Lahdensivu Arto Köliö Kei-ichi Imamoto Stefanie von Greve-Dierfeld Marijana Serdar |
spellingShingle |
Ueli Angst Fabrizio Moro Mette Geiker Sylvia Kessler Hans Beushausen Carmen Andrade Jukka Lahdensivu Arto Köliö Kei-ichi Imamoto Stefanie von Greve-Dierfeld Marijana Serdar Corrosion of steel in carbonated concrete: mechanisms, practical experience, and research priorities – a critical review by RILEM TC 281-CCC RILEM Technical Letters carbonation corrosion durability sustainability |
author_facet |
Ueli Angst Fabrizio Moro Mette Geiker Sylvia Kessler Hans Beushausen Carmen Andrade Jukka Lahdensivu Arto Köliö Kei-ichi Imamoto Stefanie von Greve-Dierfeld Marijana Serdar |
author_sort |
Ueli Angst |
title |
Corrosion of steel in carbonated concrete: mechanisms, practical experience, and research priorities – a critical review by RILEM TC 281-CCC |
title_short |
Corrosion of steel in carbonated concrete: mechanisms, practical experience, and research priorities – a critical review by RILEM TC 281-CCC |
title_full |
Corrosion of steel in carbonated concrete: mechanisms, practical experience, and research priorities – a critical review by RILEM TC 281-CCC |
title_fullStr |
Corrosion of steel in carbonated concrete: mechanisms, practical experience, and research priorities – a critical review by RILEM TC 281-CCC |
title_full_unstemmed |
Corrosion of steel in carbonated concrete: mechanisms, practical experience, and research priorities – a critical review by RILEM TC 281-CCC |
title_sort |
corrosion of steel in carbonated concrete: mechanisms, practical experience, and research priorities – a critical review by rilem tc 281-ccc |
publisher |
RILEM Publications SARL |
series |
RILEM Technical Letters |
issn |
2518-0231 |
publishDate |
2020-12-01 |
description |
Carbonation of concrete is generally assumed to lead to reinforcing steel corrosion. This mindset has long dictated the research priorities surrounding the developments towards new, low-emission binders. Here, by reviewing documented practical experience and scientific literature, we show that this widely held view is too simplistic. In fact, there are many cases from engineering practice where carbonation of the cementitious matrix surrounding the steel did not lead to noticeable corrosion or to corrosion-related damage at the level of a structure. The influencing factors that can, however, lead to considerable corrosion damage are identified as the moisture state, the microstructure of the carbonated concrete, various species that may be present – even in minor amounts – in the concrete pore solution, and the cover depth.
The circumstance that a reduced pH alone is not sufficient to lead to significant steel corrosion in concrete seriously challenges the established approach of assessing the durability performance based on carbonation testing and modeling. At the same time, this circumstance offers great opportunities for reducing the environmental impact of concrete structures with low-emission binders. To realize these opportunities, the focus in research and engineering should shift from studying carbonation to studying corrosion of steel in carbonated concrete.
|
topic |
carbonation corrosion durability sustainability |
url |
https://letters.rilem.net/index.php/rilem/article/view/127 |
work_keys_str_mv |
AT ueliangst corrosionofsteelincarbonatedconcretemechanismspracticalexperienceandresearchprioritiesacriticalreviewbyrilemtc281ccc AT fabriziomoro corrosionofsteelincarbonatedconcretemechanismspracticalexperienceandresearchprioritiesacriticalreviewbyrilemtc281ccc AT mettegeiker corrosionofsteelincarbonatedconcretemechanismspracticalexperienceandresearchprioritiesacriticalreviewbyrilemtc281ccc AT sylviakessler corrosionofsteelincarbonatedconcretemechanismspracticalexperienceandresearchprioritiesacriticalreviewbyrilemtc281ccc AT hansbeushausen corrosionofsteelincarbonatedconcretemechanismspracticalexperienceandresearchprioritiesacriticalreviewbyrilemtc281ccc AT carmenandrade corrosionofsteelincarbonatedconcretemechanismspracticalexperienceandresearchprioritiesacriticalreviewbyrilemtc281ccc AT jukkalahdensivu corrosionofsteelincarbonatedconcretemechanismspracticalexperienceandresearchprioritiesacriticalreviewbyrilemtc281ccc AT artokolio corrosionofsteelincarbonatedconcretemechanismspracticalexperienceandresearchprioritiesacriticalreviewbyrilemtc281ccc AT keiichiimamoto corrosionofsteelincarbonatedconcretemechanismspracticalexperienceandresearchprioritiesacriticalreviewbyrilemtc281ccc AT stefanievongrevedierfeld corrosionofsteelincarbonatedconcretemechanismspracticalexperienceandresearchprioritiesacriticalreviewbyrilemtc281ccc AT marijanaserdar corrosionofsteelincarbonatedconcretemechanismspracticalexperienceandresearchprioritiesacriticalreviewbyrilemtc281ccc |
_version_ |
1724289469532602368 |