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- W2222181710 abstract "Self-healing concrete is regarded as a promising solution to reduce the high maintenance and repair cost of concrete infrastructure. Due to the limited autogenous healing capacity of concrete itself, additives are needed to enhance the self-healing properties. These healing agents are pre-added into the concrete during mixing or casting and are expected to play their role (heal cracks) when cracking occurs. This PhD work aims to explore a microbial-based self-healing strategy for concrete, which has the distinct features of environmental friendliness, long-term viability and low cost. Carbonate precipitating bacteria were added into mortar specimens to in-situ heal concrete cracks when cracking occurred. Two constituents are of crucial importance in this strategy, the microbial source and the carriers for immobilization of bacteria. Bacillus sphaericus, an alkali spore-forming ureolytic strain, was selected as the microbial source due to its high carbonate production capacity, alkali adaptability and long-term viability. Four types of carriers were investigated in this study. In view of the self-healing efficiency and the possibility for practical use, the most promising carriers are microcapsules and superabsorbent polymers.Overall, the results of this doctoral research demonstrated the feasibility of using immobilized carbonate precipitating bacteria for self-healing concrete. The novel carriers used opens the perspective to bring self-healing concrete into practice." @default.
- W2222181710 created "2016-06-24" @default.
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- W2222181710 date "2013-01-01" @default.
- W2222181710 modified "2023-09-26" @default.
- W2222181710 title "Self-healing concrete by means of immobilised carbonate precipitating bacteria" @default.
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