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Nitrate reducing CaCO3 precipitating bacteria survive in mortar and inhibit steel corrosion
https://orcid.org/0000-0002-1640-0629
https://orcid.org/0000-0002-0851-6242
Abstract Microbial healing of concrete cracks is a relatively slow process, and meanwhile the steel rebar is exposed to corrosive substances. Nitrate reducing bacteria can inhibit corrosion and provide crack healing, by simultaneously producing NO2 − and inducing CaCO3 precipitation. In this study, the functionality of one non-axenic and two axenic NO3 − reducing cultures for the development of corrosion resistant self-healing concrete was investigated. Both axenic cultures survived in mortar when incorporated in protective carriers and became active 3 days after the pH dropped below 10. The non-axenic culture named “activated compact denitrifying core” (ACDC) revealed comparable resuscitation performance without any additional protection. Moreover, ACDC induced passivation of the steel in corrosive electrolyte solution (0.05 M NaCl) by producing 57 mM NO2 − in 1 week. The axenic cultures produced NO2 − up to 26.8 mM, and passivation breakdown and pitting corrosion were observed. Overall, ACDC appears suitable for corrosion resistant microbial self-healing concrete.
Nitrate reducing CaCO3 precipitating bacteria survive in mortar and inhibit steel corrosion
https://orcid.org/0000-0002-1640-0629
https://orcid.org/0000-0002-0851-6242
Abstract Microbial healing of concrete cracks is a relatively slow process, and meanwhile the steel rebar is exposed to corrosive substances. Nitrate reducing bacteria can inhibit corrosion and provide crack healing, by simultaneously producing NO2 − and inducing CaCO3 precipitation. In this study, the functionality of one non-axenic and two axenic NO3 − reducing cultures for the development of corrosion resistant self-healing concrete was investigated. Both axenic cultures survived in mortar when incorporated in protective carriers and became active 3 days after the pH dropped below 10. The non-axenic culture named “activated compact denitrifying core” (ACDC) revealed comparable resuscitation performance without any additional protection. Moreover, ACDC induced passivation of the steel in corrosive electrolyte solution (0.05 M NaCl) by producing 57 mM NO2 − in 1 week. The axenic cultures produced NO2 − up to 26.8 mM, and passivation breakdown and pitting corrosion were observed. Overall, ACDC appears suitable for corrosion resistant microbial self-healing concrete.
Nitrate reducing CaCO3 precipitating bacteria survive in mortar and inhibit steel corrosion
https://orcid.org/0000-0002-1640-0629
https://orcid.org/0000-0002-0851-6242
Abstract Microbial healing of concrete cracks is a relatively slow process, and meanwhile the steel rebar is exposed to corrosive substances. Nitrate reducing bacteria can inhibit corrosion and provide crack healing, by simultaneously producing NO2 − and inducing CaCO3 precipitation. In this study, the functionality of one non-axenic and two axenic NO3 − reducing cultures for the development of corrosion resistant self-healing concrete was investigated. Both axenic cultures survived in mortar when incorporated in protective carriers and became active 3 days after the pH dropped below 10. The non-axenic culture named “activated compact denitrifying core” (ACDC) revealed comparable resuscitation performance without any additional protection. Moreover, ACDC induced passivation of the steel in corrosive electrolyte solution (0.05 M NaCl) by producing 57 mM NO2 − in 1 week. The axenic cultures produced NO2 − up to 26.8 mM, and passivation breakdown and pitting corrosion were observed. Overall, ACDC appears suitable for corrosion resistant microbial self-healing concrete.
Nitrate reducing CaCO3 precipitating bacteria survive in mortar and inhibit steel corrosion
Erşan, Yusuf Çağatay (author) / Verbruggen, Hilke (author) / De Graeve, Iris (author) / Verstraete, Willy (author) / De Belie, Nele (author) / Boon, Nico (author)
Cement and Concrete Research ; 83 ; 19-30
2016-01-22
12 pages
Article (Journal)
Electronic Resource
English
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