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A chitosan based pH-responsive hydrogel for encapsulation of bacteria for self-sealing concrete

Jianyun Wang (UGent) , Arn Mignon (UGent) , Gilles Trenson, Sandra Van Vlierberghe (UGent) , Nico Boon (UGent) and Nele De Belie (UGent)
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Abstract
Cracks in concrete remain one of the major issues in constructions. Self-healing concrete by bacteria has already proven to be a promising way to solve this problem. In order to protect bacteria from the harsh condition in concrete, encapsulation of bacteria is preferable. In this study, a pH responsive hydrogel was synthesized to encapsulate bacterial spores for self-sealing concrete cracks. The pH responsiveness and the influence of the hydrogel on the mechanical properties were investigated. The viability of the encapsulated spores and the cell-entrapping capacity of the hydrogel were then examined. The self-sealing efficiency was evaluated by the reduction of water flow and crack sealing ratio. The results indicated that the chitosan based hydrogel had a suitable pH responsiveness. Within the pH range between 7 and 11, the swelling capacity remained stable, with no significant differences as the swelling varied between 38.5 +/- 0.5 and 42.9 +/- 1.5 g water/g hydrogel. The swelling greatly decreased to around 12.8 +/- 0.9 g water/g hydrogel in cement filtrate. The compressive strength only decreased around 5% with the addition of 1 m% of hydrogel. The specimens with hydrogel encapsulated spores showed the highest reduction in water flow (81-90%) and highest crack sealing efficiency. More than 30% of the crack locations was completely bridged. While in other specimens, only 2-12% of the crack locations was completely sealed.
Keywords
pH responsive, Hydrogei, Bacteria, Crack, Water flow, Bio-CaCO3, HEALING CONCRETE, SUPERABSORBENT POLYMERS, SPORES, CRACKS, WATER

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Chicago
Wang, Jianyun, Arn Mignon, Gilles Trenson, Sandra Van Vlierberghe, Nico Boon, and Nele De Belie. 2018. “A Chitosan Based pH-responsive Hydrogel for Encapsulation of Bacteria for Self-sealing Concrete.” Cement & Concrete Composites 93: 309–322.
APA
Wang, Jianyun, Mignon, A., Trenson, G., Van Vlierberghe, S., Boon, N., & De Belie, N. (2018). A chitosan based pH-responsive hydrogel for encapsulation of bacteria for self-sealing concrete. CEMENT & CONCRETE COMPOSITES, 93, 309–322.
Vancouver
1.
Wang J, Mignon A, Trenson G, Van Vlierberghe S, Boon N, De Belie N. A chitosan based pH-responsive hydrogel for encapsulation of bacteria for self-sealing concrete. CEMENT & CONCRETE COMPOSITES. 2018;93:309–22.
MLA
Wang, Jianyun, Arn Mignon, Gilles Trenson, et al. “A Chitosan Based pH-responsive Hydrogel for Encapsulation of Bacteria for Self-sealing Concrete.” CEMENT & CONCRETE COMPOSITES 93 (2018): 309–322. Print.
@article{8579045,
  abstract     = {Cracks in concrete remain one of the major issues in constructions. Self-healing concrete by bacteria has already proven to be a promising way to solve this problem. In order to protect bacteria from the harsh condition in concrete, encapsulation of bacteria is preferable. In this study, a pH responsive hydrogel was synthesized to encapsulate bacterial spores for self-sealing concrete cracks. The pH responsiveness and the influence of the hydrogel on the mechanical properties were investigated. The viability of the encapsulated spores and the cell-entrapping capacity of the hydrogel were then examined. The self-sealing efficiency was evaluated by the reduction of water flow and crack sealing ratio. The results indicated that the chitosan based hydrogel had a suitable pH responsiveness. Within the pH range between 7 and 11, the swelling capacity remained stable, with no significant differences as the swelling varied between 38.5 +/- 0.5 and 42.9 +/- 1.5 g water/g hydrogel. The swelling greatly decreased to around 12.8 +/- 0.9 g water/g hydrogel in cement filtrate. The compressive strength only decreased around 5\% with the addition of 1 m\% of hydrogel. The specimens with hydrogel encapsulated spores showed the highest reduction in water flow (81-90\%) and highest crack sealing efficiency. More than 30\% of the crack locations was completely bridged. While in other specimens, only 2-12\% of the crack locations was completely sealed.},
  author       = {Wang, Jianyun and Mignon, Arn and Trenson, Gilles and Van Vlierberghe, Sandra and Boon, Nico and De Belie, Nele},
  issn         = {0958-9465},
  journal      = {CEMENT \& CONCRETE COMPOSITES},
  language     = {eng},
  pages        = {309--322},
  title        = {A chitosan based pH-responsive hydrogel for encapsulation of bacteria for self-sealing concrete},
  url          = {http://dx.doi.org/10.1016/j.cemconcomp.2018.08.007},
  volume       = {93},
  year         = {2018},
}

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