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Bacteria-based self-healing concrete : Effect of bio-agents on the cementitious matrix

Jianyun Wang (UGent) , Nico Boon (UGent) and Nele De Belie (UGent)
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Abstract
In this paper, the influence of the specific bacterial nutriënt (yeast extract) and the precitation precursors (urea and Ca-nitrate) on cement hydration and mechanical proper were first investigated. Meanwhile, the availability of the nutriënt after being mixed into cementitious matrix was examined. Due to the harsh conditions of concrete (high alkaline and small pore size), bacteria need to be immobilized beforehand. Therefore the property of the carrier candidates used for immobilization were also evaluated on the aspects of pore properties and the compatibility with the cementitious matri. Experimental result show that yeast extract greatly retarded cement hydration and had a remarkable negative effect on the strength of the mortar. The strength was greatly decreased when the addition was higher than 0.34%. The precipitation precursors had moderate effect on the strength and the optimal dosage was 4% for urea and 8% for Ca-nitrate by the mass of cement Argex had a much higher porosity (50%) than that of Lava (16%) and ha a more suitable pore size distribution for immobilizatin of bacteria. Both of them had a good compatibility with the cementitious matrix.
Keywords
bacterial nutrient, precipitation precursor, porous carrier, compatibility, hydration

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Chicago
Wang, Jianyun, Nico Boon, and Nele De Belie. 2018. “Bacteria-based Self-healing Concrete : Effect of Bio-agents on the Cementitious Matrix.” In Recent Advances in Concrete Technology and Sustainability Issues, ed. Tongbo Sui, Terence C. Holland, Ziming Wang, and Xiaolong Zhao, 151–161. ACI.
APA
Wang, Jianyun, Boon, N., & De Belie, N. (2018). Bacteria-based self-healing concrete : Effect of bio-agents on the cementitious matrix. In T. Sui, T. C. Holland, Z. Wang, & X. Zhao (Eds.), Recent Advances in Concrete Technology and Sustainability Issues (pp. 151–161). Presented at the Recent Advances in Concrete Technology and Sustainability Issues, ACI.
Vancouver
1.
Wang J, Boon N, De Belie N. Bacteria-based self-healing concrete : Effect of bio-agents on the cementitious matrix. In: Sui T, Holland TC, Wang Z, Zhao X, editors. Recent Advances in Concrete Technology and Sustainability Issues. ACI; 2018. p. 151–61.
MLA
Wang, Jianyun, Nico Boon, and Nele De Belie. “Bacteria-based Self-healing Concrete : Effect of Bio-agents on the Cementitious Matrix.” Recent Advances in Concrete Technology and Sustainability Issues. Ed. Tongbo Sui et al. ACI, 2018. 151–161. Print.
@inproceedings{8600888,
  abstract     = {In this paper, the influence of the specific bacterial nutri{\"e}nt (yeast extract) and the precitation precursors (urea and Ca-nitrate) on cement hydration and mechanical proper were first investigated. Meanwhile, the availability of the nutri{\"e}nt after being mixed into  cementitious matrix was examined. Due to the harsh conditions of concrete (high alkaline and small pore size), bacteria need to be immobilized beforehand. Therefore the property of the carrier candidates used for immobilization were also evaluated on the aspects of pore properties and the compatibility with the cementitious matri. Experimental result show that yeast extract greatly retarded cement hydration and had a remarkable negative effect on the strength of the mortar. The strength was greatly decreased when the addition was higher than 0.34\%. The precipitation precursors had moderate effect on the strength and the optimal dosage was 4\% for urea and 8\% for Ca-nitrate by the mass of cement Argex had a much higher porosity (50\%) than that of Lava (16\%) and ha a more suitable  pore size distribution for immobilizatin of bacteria. Both of them had a good compatibility with the cementitious matrix.},
  author       = {Wang, Jianyun and Boon, Nico and De Belie, Nele},
  booktitle    = {Recent Advances in Concrete Technology and Sustainability Issues},
  editor       = {Sui, Tongbo and Holland, Terence C. and Wang, Ziming and Zhao, Xiaolong},
  isbn         = {9781641950305},
  language     = {eng},
  location     = {Beijing},
  pages        = {151--161},
  publisher    = {ACI},
  title        = {Bacteria-based self-healing concrete : Effect of bio-agents on the cementitious matrix},
  year         = {2018},
}