United States Department of Transportation
i
Experimental Investigation of the Self-Healing Potential of Bacteria for Sustainable Concrete Structures [Brief]
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2023-05-01
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[PDF-269.25 KB]
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Abstract:Concrete is the most widely used building material in the world, but—due to its limited tensile strength—cracking is a common phenomenon in concrete elements. Cracks may affect the durability of concrete structures by allowing potentially harmful liquids or gasses to sink in. Additionally, the steel reinforcement within concrete elements may be affected by degradation phenomena, such as corrosion. Increasing the service life of concrete structures is a key task of civil engineering, and self-healing is an eco-friendly and low-cost method to increase the durability of concrete. This work aims to study an autonomous self-healing technique. The crack-healing potential of different types of high-alkaline-tolerant bacteria or calcite-precipitation microorganisms is investigated. The outcomes of experimental tests on concrete samples healed with biological processes demonstrate how this technique can be implemented when retrofitting durability-enhanced, eco-friendly concrete structures to improve the strength of durability of the material.
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