A Bacteria-Based Self-Healing Cementitious Composite for Application in Low-Temperature Marine Environments.
| Autor: | Palin D; Microlab, Section of Materials and Environment, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2628 CN Delft, The Netherlands. d.palin@tudelft.nl., Wiktor V; Microlab, Section of Materials and Environment, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2628 CN Delft, The Netherlands. v.a.c.wiktor@tudelft.nl., Jonkers HM; Microlab, Section of Materials and Environment, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2628 CN Delft, The Netherlands. h.m.Jonkers@tudelft.nl. |
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| Jazyk: | angličtina |
| Zdroj: | Biomimetics (Basel, Switzerland) [Biomimetics (Basel)] 2017 Jul 14; Vol. 2 (3). Date of Electronic Publication: 2017 Jul 14. |
| DOI: | 10.3390/biomimetics2030013 |
| Abstrakt: | The current paper presents a bacteria-based self-healing cementitious composite for application in low-temperature marine environments. The composite was tested for its crack-healing capacity through crack water permeability measurements, and strength development through compression testing. The composite displayed an excellent crack-healing capacity, reducing the permeability of cracks 0.4 mm wide by 95%, and cracks 0.6 mm wide by 93% following 56 days of submersion in artificial seawater at 8 °C. Healing of the cracks was attributed to autogenous precipitation, autonomous bead swelling, magnesium-based mineral precipitation, and bacteria-induced calcium-based mineral precipitation in and on the surface of the bacteria-based beads. Mortar specimens incorporated with beads did, however, exhibit lower compressive strengths than plain mortar specimens. This study is the first to present a bacteria-based self-healing cementitious composite for application in low-temperature marine environments, while the formation of a bacteria-actuated organic⁻inorganic composite healing material represents an exciting avenue for self-healing concrete research. Competing Interests: The authors declare no conflicts of interest. |
| Databáze: | MEDLINE |
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