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Self-healing efficiency of cement-based materials containing extruded cementitious hollow tubes filled with bacterial healing agent

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Abstract
In this work, the use of the ureolytic strain Bacillus sphaericus for developing a self-healing cementitious material was investigated. These bacteria are able to precipitate CaCO3, thus the preciptated crystals can fill the cracks that can reduce the service life of concrete as a function of their size and distribution. These crystals are compatible with the concrete matrix and are environmentally-friendly. However, bacterial activity decreases in the high-pH environment inside concrete and bacterial cells might be destroyed during the hydration process if they are not adequately protected. To provide protection against the alkaline environment and preserve the bacterial vitality, extruded cementitious hollkow tubes were used in this study as containingreleasing devices. Self-healing mortar speciments were produced by incorporating one tube filled with the bacterial suspension and silica sol coupled to another filled with the deposition medium. The self-healing efficiency was assessed in terms of capability to autonomously seal some intentionally-introduced cracks. It was quantified though the reduction in water flow/uptake during permeabilityabsorption tets. Encouraging results were achieved, suggesting that the proposed self-healing system can be effective in prolonging the material functionality, since the permeability reduction leads to an increased protection against the ingress of water-based deleterious substances.

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MLA
Anglani, Giovanni et al. “Self-healing Efficiency of Cement-based Materials Containing Extruded Cementitious Hollow Tubes Filled with Bacterial Healing Agent.” Final Conference of RILEM TC 253-MCI : Microorganisms-Cementitious Materials Interactions. Ed. Alexandra Bertron & Henk Jonkers. Vol. 2. Paris: RILEM Publications, 2018. 425–431. Print.
APA
Anglani, G., Antonaci, P., Tulliani, J.-M., Van Tittelboom, K., Wang, J., & De Belie, N. (2018). Self-healing efficiency of cement-based materials containing extruded cementitious hollow tubes filled with bacterial healing agent. In A. Bertron & H. Jonkers (Eds.), Final Conference of RILEM TC 253-MCI : Microorganisms-Cementitious Materials Interactions (Vol. 2, pp. 425–431). Presented at the Final Conference of RILEM TC 253-MCI : Microorganisms-Cementitious Materials Interactions, Paris: RILEM Publications.
Chicago author-date
Anglani, Giovanni, Paola Antonaci, Jean-Marc Tulliani, Kim Van Tittelboom, Jianyun Wang, and Nele De Belie. 2018. “Self-healing Efficiency of Cement-based Materials Containing Extruded Cementitious Hollow Tubes Filled with Bacterial Healing Agent.” In Final Conference of RILEM TC 253-MCI : Microorganisms-Cementitious Materials Interactions, ed. Alexandra Bertron and Henk Jonkers, 2:425–431. Paris: RILEM Publications.
Chicago author-date (all authors)
Anglani, Giovanni, Paola Antonaci, Jean-Marc Tulliani, Kim Van Tittelboom, Jianyun Wang, and Nele De Belie. 2018. “Self-healing Efficiency of Cement-based Materials Containing Extruded Cementitious Hollow Tubes Filled with Bacterial Healing Agent.” In Final Conference of RILEM TC 253-MCI : Microorganisms-Cementitious Materials Interactions, ed. Alexandra Bertron and Henk Jonkers, 2:425–431. Paris: RILEM Publications.
Vancouver
1.
Anglani G, Antonaci P, Tulliani J-M, Van Tittelboom K, Wang J, De Belie N. Self-healing efficiency of cement-based materials containing extruded cementitious hollow tubes filled with bacterial healing agent. In: Bertron A, Jonkers H, editors. Final Conference of RILEM TC 253-MCI : Microorganisms-Cementitious Materials Interactions. Paris: RILEM Publications; 2018. p. 425–31.
IEEE
[1]
G. Anglani, P. Antonaci, J.-M. Tulliani, K. Van Tittelboom, J. Wang, and N. De Belie, “Self-healing efficiency of cement-based materials containing extruded cementitious hollow tubes filled with bacterial healing agent,” in Final Conference of RILEM TC 253-MCI : Microorganisms-Cementitious Materials Interactions, Toulouse, 2018, vol. 2, pp. 425–431.
@inproceedings{8599090,
  abstract     = {In this work, the use of the ureolytic strain Bacillus sphaericus for developing a self-healing cementitious material was investigated. These bacteria are able to precipitate CaCO3, thus the preciptated crystals can fill the cracks that can reduce the service life of concrete as a function of their size and distribution. These crystals are compatible with the concrete matrix and are environmentally-friendly. However, bacterial activity decreases in the high-pH environment inside concrete and bacterial cells might be destroyed during the hydration process if they are not adequately protected.
To provide protection against the alkaline environment and preserve the bacterial vitality, extruded cementitious hollkow tubes were used in this study as containingreleasing devices. Self-healing mortar speciments were produced by incorporating one tube filled with the bacterial suspension and silica sol coupled to another filled with the deposition medium.
The self-healing efficiency was assessed in terms of capability to autonomously seal some intentionally-introduced cracks. It was quantified though the reduction in water flow/uptake during permeabilityabsorption tets.
Encouraging results were achieved, suggesting that the proposed self-healing system can be effective in prolonging the material functionality, since the permeability reduction leads to an increased protection against the ingress of water-based deleterious substances.},
  author       = {Anglani, Giovanni and Antonaci, Paola and Tulliani, Jean-Marc and Van Tittelboom, Kim and Wang, Jianyun and De Belie, Nele},
  booktitle    = {Final Conference of RILEM TC 253-MCI : Microorganisms-Cementitious Materials Interactions},
  editor       = {Bertron, Alexandra and Jonkers, Henk},
  isbn         = {9782351582077},
  language     = {eng},
  location     = {Toulouse},
  pages        = {425--431},
  publisher    = {RILEM Publications},
  title        = {Self-healing efficiency of cement-based materials containing extruded cementitious hollow tubes filled with bacterial healing agent},
  volume       = {2},
  year         = {2018},
}