Nitrate reducing CaCO₃ precipitating bacteria survive in mortar and inhibit steel corrosion

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 NO₂ˉ and inducing CaCO₃ precipitation. In this study, the functionality of one non-axenic and two axenic NO₃ˉ 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 NO₂ˉ in 1 week. The axenic cultures produced NO₂ˉ up to 26.8 mM, and passivation breakdown and pitting corrosion were observed. Overall, ACDC appears suitable for corrosion resistant microbial self-healing concrete.

• Record URL:
  • https://doi.org/10.1016/j.cemconres.2016.01.009
• Record URL:
  • http://www.sciencedirect.com/science/article/pii/S0008884616300709
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00088846
• Supplemental Notes:
  • Abstract reprinted with permission from Elsevier.
• Authors:
  • Ersan, Yusuf Çagatay
  • Verbruggen, Hilke
  • De Graeve, Iris
  • Verstraete, Willy
  • De Belie, Nele
  • Boon, Nico
• Publication Date: 2016-5

Language

• English

Media Info

• Media Type: Web
• Features: Figures; Photos; References; Tables;
• Pagination: pp 19-30
• Serial:
  • Cement and Concrete Research
  • Volume: 83
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Bacteria; Calcium carbonate; Corrosion; Corrosion resistance; Nitrates; Nitrites; Reinforcing bars
• Uncontrolled Terms: Denitrification; Self-healing concrete
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 01597425
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 27 2016 5:57PM