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Ureolytic bacteria-based self-healing concrete

Author(s): J. Wang, N. De Belie
Paper category: Conference
Book Title: International RILEM Conference on Microorganisms-Cementitious Materials Interactions
Editors: Virginie Wiktor, Henk Jonkers, Alexandra Bertron
e-ISBN: 978-2-35158-160-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 103-114
Total Pages: 12
Language: English

Abstract: The bacteria-based self-healing concrete is mainly based on the bacterially induced carbonate precipitation process. Carbonate precipitating bacteria are pre-added into specimens during the mixing process and in-situ precipitation CaCO3 to heal cracks when cracking occurs. Almost all kind of bacteria can produce or induce the formation of CaCO3 if given suitable conditions. Among so many pathways relevant to bacterial CaCO3 precipitation, degradation of urea or bacterial ureolysis (enzymatic hydrolysis of urea) has been extensively studied by many researchers because the process is easy to control and the output of CaCO3 precipitation is quite considerable for the aim of practical applications. Additionally, most of the ureolytic strains are alkali-tolerant, which seems promising for their use in concrete concerning its alkaline environment. This paper provides a brief overview on the ureolytic bacteria based self-healing concrete: the composition of the self-healing unit, the interactions with the concrete matrix, and the healing/sealing efficiency. Since bacterial ureolytic activity directly determines the productivity of biogenic CaCO3, and hence the crack healing efficiency, factors affecting bacterial ureolytic activity are extensively discussed. Meanwhile, challenges, restrictions and perspectives of ureolytic bacteria based self-healing system are also outlined.

Online publication: 2016
Publication Type: full_text
Public price (Euros): 0.00

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