Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Application of hydrogel encapsulated carbonate precipitating bacteria for approaching a realistic self-healing in concrete
Highlights Hydrogel was used as the bacterial carrier in concrete for self-healing cracks. Hydrogel acts as water reservoirs for continuous crack healing (autogenic-, biogenic-). Carbonate precipitating bacteria can precipitate CaCO3 in/on hydrogel. Crack of a width 0.5mm can be completely healed in the specimens with bio-hydrogels embedded. Bacterial based self-healing is a potential solution for sustainable development of concrete.
Abstract Bacterial-based self-healing is a promising solution for sustainable concrete maintenance. In this study, bacterial spores were first encapsulated into hydrogels and then were incorporated into specimens to investigate their healing efficiency. The precipitation of CaCO3 by hydrogel-encapsulated spores was demonstrated by Thermogravimetric analysis (TGA). The mortar specimens with hydrogel-encapsulated spores, showed a distinct self-healing superiority: the maximum healed crack width was about 0.5mm and the water permeability was decreased by 68% in average. Other specimens in non-bacterial series had maximum healed crack width of 0–0.3mm and the average water permeability was decreased by 15–55% only.
Application of hydrogel encapsulated carbonate precipitating bacteria for approaching a realistic self-healing in concrete
Highlights Hydrogel was used as the bacterial carrier in concrete for self-healing cracks. Hydrogel acts as water reservoirs for continuous crack healing (autogenic-, biogenic-). Carbonate precipitating bacteria can precipitate CaCO3 in/on hydrogel. Crack of a width 0.5mm can be completely healed in the specimens with bio-hydrogels embedded. Bacterial based self-healing is a potential solution for sustainable development of concrete.
Abstract Bacterial-based self-healing is a promising solution for sustainable concrete maintenance. In this study, bacterial spores were first encapsulated into hydrogels and then were incorporated into specimens to investigate their healing efficiency. The precipitation of CaCO3 by hydrogel-encapsulated spores was demonstrated by Thermogravimetric analysis (TGA). The mortar specimens with hydrogel-encapsulated spores, showed a distinct self-healing superiority: the maximum healed crack width was about 0.5mm and the water permeability was decreased by 68% in average. Other specimens in non-bacterial series had maximum healed crack width of 0–0.3mm and the average water permeability was decreased by 15–55% only.
Application of hydrogel encapsulated carbonate precipitating bacteria for approaching a realistic self-healing in concrete
Wang, J.Y. (Autor:in) / Snoeck, D. (Autor:in) / Van Vlierberghe, S. (Autor:in) / Verstraete, W. (Autor:in) / De Belie, N. (Autor:in)
Construction and Building Materials ; 68 ; 110-119
13.06.2014
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Online Contents | 2014
| British Library Online Contents | 2014