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Microbial nitrate reduction induced autonomous self-healing in concrete

Yusuf Cagatay Ersan UGent (2016)
abstract
Concrete is the most widely used construction material in structures such as tunnels, bridges, car parks etc. Since concrete is a relatively weak material under tensile stresses, to achieve a durable structure concrete is usually combined with the steel reinforcement bars. However, in service, due to the physical and chemical factors, micro-cracks occur on concrete which enable aggressive substances to reach steel rebars causing corrosion. Therefore, regular monitoring and repair of the concrete cracks are necessary. In order to minimize the external maintenance services and related expenses, researchers focused on mechanisms triggering self-healing of these cracks. Microbial induced CaCO3 precipitation (MICP) can be mentioned among the investigated mechanisms. Basically, in MICP, the CO2 produced by the bacteria precipitates in the form of CaCO3 inside the concrete cracks and fills them up. This study presents the use of NO3- respiring bacteria to develop microbial self-healing concrete. In the context of the study, individual cultures (Pseudomonas aeruginosa and Diaphorobacter nitroreducens) were tested for their CaCO3 precipitation yields and their performance inside the mortar. Different protective carriers were used to incorporate these bacteria in mortar. Additionally, a self-protected culture in granular form was tested. As a result, cracks up to 500 µm crack width could be sealed. Water permeability of the cracked mortar specimens decreased 85 % following microbial healing of the cracks.
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author
promoter
UGent and UGent
organization
alternative title
Microbiële nitraat-reductie induceert autonome zelfheling in beton
year
type
dissertation
publication status
published
subject
keyword
corrosion inhibition, self-protected culture, concrete, bio-granule, calcite, resilient
pages
VI, 220 pages
publisher
Ghent University. Faculty of Bioscience Engineering
place of publication
Ghent, Belgium
defense location
Gent : Het Pand (zaal rector Blancquaert)
defense date
2016-01-21 10:00
ISBN
9789059898578
project
290308 - Training Network for Self-Healing Materials: from Concepts to Market
language
English
UGent publication?
yes
classification
D1
copyright statement
I have transferred the copyright for this publication to the publisher
id
7040068
handle
http://hdl.handle.net/1854/LU-7040068
date created
2016-01-17 11:56:06
date last changed
2017-11-09 11:39:25
@phdthesis{7040068,
  abstract     = {Concrete is the most widely used construction material in structures such as tunnels, bridges, car parks etc. Since concrete is a relatively weak material under tensile stresses, to achieve a durable structure concrete is usually combined with the steel reinforcement bars. However, in service, due to the physical and chemical factors, micro-cracks occur on concrete which enable aggressive substances to reach steel rebars causing corrosion. Therefore, regular monitoring and repair of the concrete cracks are necessary.
In order to minimize the external maintenance services and related expenses, researchers focused on mechanisms triggering self-healing of these cracks. Microbial induced CaCO3 precipitation (MICP) can be mentioned among the investigated mechanisms. Basically, in MICP, the CO2 produced by the bacteria precipitates in the form of CaCO3 inside the concrete cracks and fills them up. 
This study presents the use of NO3- respiring bacteria to develop microbial self-healing concrete. In the context of the study, individual cultures (Pseudomonas aeruginosa and Diaphorobacter nitroreducens) were tested for their CaCO3 precipitation yields and their performance inside the mortar. Different protective carriers were used to incorporate these bacteria in mortar. Additionally, a self-protected culture in granular form was tested. As a result, cracks up to 500 {\textmu}m crack width could be sealed. Water permeability of the cracked mortar specimens decreased 85 \% following microbial healing of the cracks.},
  author       = {Cagatay Ersan, Yusuf},
  isbn         = {9789059898578},
  keyword      = {corrosion inhibition,self-protected culture,concrete,bio-granule,calcite,resilient},
  language     = {eng},
  pages        = {VI, 220},
  publisher    = {Ghent University. Faculty of Bioscience Engineering},
  school       = {Ghent University},
  title        = {Microbial nitrate reduction induced autonomous self-healing in concrete},
  year         = {2016},
}

Chicago
Cagatay Ersan, Yusuf. 2016. “Microbial Nitrate Reduction Induced Autonomous Self-healing in Concrete”. Ghent, Belgium: Ghent University. Faculty of Bioscience Engineering.
APA
Cagatay Ersan, Y. (2016). Microbial nitrate reduction induced autonomous self-healing in concrete. Ghent University. Faculty of Bioscience Engineering, Ghent, Belgium.
Vancouver
1.
Cagatay Ersan Y. Microbial nitrate reduction induced autonomous self-healing in concrete. [Ghent, Belgium]: Ghent University. Faculty of Bioscience Engineering; 2016.
MLA
Cagatay Ersan, Yusuf. “Microbial Nitrate Reduction Induced Autonomous Self-healing in Concrete.” 2016 : n. pag. Print.