Application of bacteria as self-healing agent for the development of sustainable concrete |
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| Authors: | Henk M Jonkers Arjan Thijssen Gerard Muyzer Oguzhan Copuroglu Erik Schlangen |
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| Institution: | 1. Delft University of Technology, Faculty of Civil Engineering & Geosciences - Department of Materials & Environment, Stevinweg 1, 2628 CN Delft, The Netherlands;2. Department of Biotechnology, Faculty of Applied Sciences, Julianalaan 67, 2628 BC Delft, The Netherlands;1. Department of Civil Engineering, Ryerson University, 350 Victoria St., Toronto, ON, M5B 2K3, Canada;2. Department of Chemistry & Biology, Ryerson University, 350 Victoria St., Toronto, ON, M5B 2K3, Canada;1. Department of Civil and Environmental Engineering, University of Texas at San Antonio, San Antonio, TX, USA;2. Department of Civil Engineering, North Dakota State University, Fargo, ND, USA;1. BRE Centre for Innovative Construction Materials, University of Bath, UK;2. Department of Biology and Biochemistry, University of Bath, UK |
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| Abstract: | The application of concrete is rapidly increasing worldwide and therefore the development of sustainable concrete is urgently needed for environmental reasons. As presently about 7% of the total anthropogenic atmospheric CO2 emission is due to cement production, mechanisms that would contribute to a longer service life of concrete structures would make the material not only more durable but also more sustainable. One such mechanism that receives increasing attention in recent years is the ability for self-repair, i.e. the autonomous healing of cracks in concrete. In this study we investigated the potential of bacteria to act as self-healing agent in concrete, i.e. their ability to repair occurring cracks. A specific group of alkali-resistant spore-forming bacteria related to the genus Bacillus was selected for this purpose. Bacterial spores directly added to the cement paste mixture remained viable for a period up to 4 months. A continuous decrease in pore size diameter during cement stone setting probably limited life span of spores as pore widths decreased below 1 μm, the typical size of Bacillus spores. However, as bacterial cement stone specimens appeared to produce substantially more crack-plugging minerals than control specimens, the potential application of bacterial spores as self-healing agent appears promising. |
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