Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Application of modified-alginate encapsulated carbonate producing bacteria in concrete: a promising strategy for crack self-healing
Self-healing concrete holds promising benefits to reduce the cost for concrete maintenance and repair as cracks are autonomously repaired without any human intervention. In this study, the application of a carbonate precipitating bacterium Bacillus sphaericus was explored. Regarding the harsh condition in concrete, B. sphaericus spores were first encapsulated into a modified-alginate based hydrogel (AM-H) which was proven to have a good compatibility with the bacteria and concrete regarding the influence on bacterial viability and concrete strength. Experimental results show that the spores were still viable after encapsulation. Encapsulated spores can precipitate a large amount of CaCO3 in/on the hydrogel matrix (around 70% by weight). Encapsulated B. sphaericus spores were added into mortar specimens and bacterial in situ activity was demonstrated by the oxygen consumption on the mimicked crack surface. While specimens with free spores added showed no oxygen consumption. This indicates the efficient protection of the hydrogel for spores in concrete. To conclude, the AM-H encapsulated carbonate precipitating bacteria have great potential to be used for crack self-healing in concrete applications.
Application of modified-alginate encapsulated carbonate producing bacteria in concrete: a promising strategy for crack self-healing
Self-healing concrete holds promising benefits to reduce the cost for concrete maintenance and repair as cracks are autonomously repaired without any human intervention. In this study, the application of a carbonate precipitating bacterium Bacillus sphaericus was explored. Regarding the harsh condition in concrete, B. sphaericus spores were first encapsulated into a modified-alginate based hydrogel (AM-H) which was proven to have a good compatibility with the bacteria and concrete regarding the influence on bacterial viability and concrete strength. Experimental results show that the spores were still viable after encapsulation. Encapsulated spores can precipitate a large amount of CaCO3 in/on the hydrogel matrix (around 70% by weight). Encapsulated B. sphaericus spores were added into mortar specimens and bacterial in situ activity was demonstrated by the oxygen consumption on the mimicked crack surface. While specimens with free spores added showed no oxygen consumption. This indicates the efficient protection of the hydrogel for spores in concrete. To conclude, the AM-H encapsulated carbonate precipitating bacteria have great potential to be used for crack self-healing in concrete applications.
Application of modified-alginate encapsulated carbonate producing bacteria in concrete: a promising strategy for crack self-healing
Wang, Jianyun (Autor:in) / Mignon, Arn (Autor:in) / Snoeck, Didier (Autor:in) / Wiktor, Virginie (Autor:in) / Van Vlierberghe, Sandra (Autor:in) / Boon, Nico (Autor:in) / De Belie, Nele (Autor:in)
01.01.2015
FRONTIERS IN MICROBIOLOGY ; ISSN: 1664-302X
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
B. sphaericus spores , in situ activity , BIOMINERALIZATION , PRECIPITATION , LIMESTONE , Modified-alginate hydrogel , oxygen consumption , CEMENTATION , bacterial CaCO3 , Technology and Engineering , SOIL , REINFORCEMENT , SURVIVAL , STRENGTH , crack self-healing , CALCIUM-CARBONATE , SUPERABSORBENT POLYMERS
Alginate encapsulation technology of bacteria for promising self-healing concrete
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