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A platform for research: civil engineering, architecture and urbanism
Deinococcus radiodurans: A novel bacterium for crack remediation of concrete with special applicability to low-temperature conditions
Abstract Typical bacteria used for the preparation of microbial concrete, such as from the Bacillus species, are spore-forming at low temperatures, which is restrictive for their usage as a self-healing agent in concrete at low-temperature conditions through direct application. In this paper, a novel, non-spore-forming, extremophilic bacterium, Deinococcus radiodurans, is investigated for self-healing of concrete at room temperature (27 ± 2 °C) as well as at near-freezing temperature (4 ± 1 °C). The bacteria was directly added to the mortar mix in three different cell concentrations, namely, 103, 105 and 107 cells/ml. Results indicate that the inclusion of D. radiodurans as an additive results in significant calcium carbonate precipitation, leading to effective crack-healing at both the tested temperatures. Substantial improvement in the compressive strength and water absorption of the mortar samples are obtained. It is thus concluded that D. radiodurans can be utilized to prepare microbial concrete at both room and low-temperature conditions, without adopting any special application methodologies.
Deinococcus radiodurans: A novel bacterium for crack remediation of concrete with special applicability to low-temperature conditions
Abstract Typical bacteria used for the preparation of microbial concrete, such as from the Bacillus species, are spore-forming at low temperatures, which is restrictive for their usage as a self-healing agent in concrete at low-temperature conditions through direct application. In this paper, a novel, non-spore-forming, extremophilic bacterium, Deinococcus radiodurans, is investigated for self-healing of concrete at room temperature (27 ± 2 °C) as well as at near-freezing temperature (4 ± 1 °C). The bacteria was directly added to the mortar mix in three different cell concentrations, namely, 103, 105 and 107 cells/ml. Results indicate that the inclusion of D. radiodurans as an additive results in significant calcium carbonate precipitation, leading to effective crack-healing at both the tested temperatures. Substantial improvement in the compressive strength and water absorption of the mortar samples are obtained. It is thus concluded that D. radiodurans can be utilized to prepare microbial concrete at both room and low-temperature conditions, without adopting any special application methodologies.
Deinococcus radiodurans: A novel bacterium for crack remediation of concrete with special applicability to low-temperature conditions
Mondal, Sandip (author) / Das, Pratyusa (author) / Datta, Pallab (author)
2020-01-14
Article (Journal)
Electronic Resource
English
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