Journal
CEMENT AND CONCRETE RESEARCH
Volume 83, Issue -, Pages 19-30Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2016.01.009
Keywords
Aggressive environment; Self-healing; Nitrite; Denitrification; Protective carrier
Funding
- European Union [290308]
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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. (C) 2016 Elsevier Ltd. All rights reserved.
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