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Enhanced crack closure performance of microbial mortar through nitrate reduction

Yusuf Cagatay Ersan (UGent) , Emma Hernandez Sanabria (UGent) , Nico Boon (UGent) and Nele De Belie (UGent)
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SHeMat - grat number 290308
Abstract
Microbial self-healing of concrete has been widely investigated, yet the suggested microbial pathways are limited to ureolysis and the aerobic oxidation of carbon sources. Each of these pathways has certain environment and process related drawbacks which arise a need for an alternative pathway to proceed further. This study presents the NO3− reduction as an alternative microbial self-healing strategy. In the tests, we used previously described NO3− reducing bacteria, and two different porous protective carriers. The highest crack width healed by the bacteria was 370 ± 20 μm in 28 days and 480 ± 16 μm in 56 days. Water tightness regain up to 85% was achieved at the end of 56 days for 465 ± 21 μm crack width. Precipitates were identified as forms of CaCO3 and were abundant in microbial specimens particularly on the inner crack surface. The findings evidence the potential of the NO3− reduction pathway for development of microbial self-healing concrete.
Keywords
Self-healing, Functionality regain, Bacteria based, Inner crack surface, Porous carrier, SELF-HEALING CONCRETE, CARBONATE PRECIPITATION, INFRARED-SPECTROSCOPY, BACTERIA, DENITRIFICATION, QUANTIFICATION, CEMENT

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Citation

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MLA
Ersan, Yusuf Cagatay, et al. “Enhanced Crack Closure Performance of Microbial Mortar through Nitrate Reduction.” CEMENT & CONCRETE COMPOSITES, vol. 70, Elsevier, 2016, pp. 159–70.
APA
Ersan, Y. C., Hernandez Sanabria, E., Boon, N., & De Belie, N. (2016). Enhanced crack closure performance of microbial mortar through nitrate reduction. CEMENT & CONCRETE COMPOSITES, 70, 159–170.
Chicago author-date
Ersan, Yusuf Cagatay, Emma Hernandez Sanabria, Nico Boon, and Nele De Belie. 2016. “Enhanced Crack Closure Performance of Microbial Mortar through Nitrate Reduction.” CEMENT & CONCRETE COMPOSITES 70: 159–70.
Chicago author-date (all authors)
Ersan, Yusuf Cagatay, Emma Hernandez Sanabria, Nico Boon, and Nele De Belie. 2016. “Enhanced Crack Closure Performance of Microbial Mortar through Nitrate Reduction.” CEMENT & CONCRETE COMPOSITES 70: 159–170.
Vancouver
1.
Ersan YC, Hernandez Sanabria E, Boon N, De Belie N. Enhanced crack closure performance of microbial mortar through nitrate reduction. CEMENT & CONCRETE COMPOSITES. 2016;70:159–70.
IEEE
[1]
Y. C. Ersan, E. Hernandez Sanabria, N. Boon, and N. De Belie, “Enhanced crack closure performance of microbial mortar through nitrate reduction,” CEMENT & CONCRETE COMPOSITES, vol. 70, pp. 159–170, 2016.
@article{7257489,
  abstract     = {Microbial self-healing of concrete has been widely investigated, yet the suggested microbial pathways are limited to ureolysis and the aerobic oxidation of carbon sources. Each of these pathways has certain environment and process related drawbacks which arise a need for an alternative pathway to proceed further. This study presents the NO3− reduction as an alternative microbial self-healing strategy. In the tests, we used previously described NO3− reducing bacteria, and two different porous protective carriers. The highest crack width healed by the bacteria was 370 ± 20 μm in 28 days and 480 ± 16 μm in 56 days. Water tightness regain up to 85% was achieved at the end of 56 days for 465 ± 21 μm crack width. Precipitates were identified as forms of CaCO3 and were abundant in microbial specimens particularly on the inner crack surface. The findings evidence the potential of the NO3− reduction pathway for development of microbial self-healing concrete.},
  author       = {Ersan, Yusuf Cagatay and Hernandez Sanabria, Emma and Boon, Nico and De Belie, Nele},
  issn         = {0958-9465},
  journal      = {CEMENT & CONCRETE COMPOSITES},
  keywords     = {Self-healing,Functionality regain,Bacteria based,Inner crack surface,Porous carrier,SELF-HEALING CONCRETE,CARBONATE PRECIPITATION,INFRARED-SPECTROSCOPY,BACTERIA,DENITRIFICATION,QUANTIFICATION,CEMENT},
  language     = {eng},
  pages        = {159--170},
  publisher    = {Elsevier},
  title        = {Enhanced crack closure performance of microbial mortar through nitrate reduction},
  url          = {http://dx.doi.org/10.1016/j.cemconcomp.2016.04.001},
  volume       = {70},
  year         = {2016},
}

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