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Hydrogel encapsulated bacterial spores for self-healing concrete: proof of concept
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 as such, additives are needed to enhance its self-healing properties. Among various strategies, microbial-based self-healing has gained increasing attention because of its distinct features including environmental friendliness, long-term viability and low cost. Within the framework of this strategy, bacteria and the relevant bio-reagents are pre-added into the concrete during the casting and are expected to play their role (heal cracks) when cracking occurs. Due to the high alkalinity and small pore sizes of concrete, bacteria cannot be added directly, and hence an immobilization process is required prior to incorporation into concrete. In the present work, a bio-compatible hydrogel was evaluated as the carrier to encapsulate an efficient carbonate precipitating bacteria, Bacillus sphaericus, which was selected based on previous research. As proof of concept, the activity of bacterial spores after immobilization, the carbonatogenesity of the hydrogel encapsulated spores, the influence of the bio-agents on the hydrogel swelling properties, and the crack healing efficiency were investigated. Interestingly, no significant viability loss was observed after the immobilization process. The precipitation of CaCO3 in/on the hydrogel matrix by the encapsulated spores was demonstrated by thermogravimetric analysis (TGA). The swelling capacity of the hydrogel was slightly increased after incorporation of the bio-agents. In addition, the specimens combined with the bio-hydrogels showed an obvious superiority in crack healing efficiency, both with respect to the healing rate as well as the maximum healed crack width. A maximum crack width of about 0.5mm can be healed in the specimens containing bio-hydrogels within 7d, while no crack healing was observed in the reference specimens. The feasibility of using hydrogel immobilized bacteria ...
Hydrogel encapsulated bacterial spores for self-healing concrete: proof of concept
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 as such, additives are needed to enhance its self-healing properties. Among various strategies, microbial-based self-healing has gained increasing attention because of its distinct features including environmental friendliness, long-term viability and low cost. Within the framework of this strategy, bacteria and the relevant bio-reagents are pre-added into the concrete during the casting and are expected to play their role (heal cracks) when cracking occurs. Due to the high alkalinity and small pore sizes of concrete, bacteria cannot be added directly, and hence an immobilization process is required prior to incorporation into concrete. In the present work, a bio-compatible hydrogel was evaluated as the carrier to encapsulate an efficient carbonate precipitating bacteria, Bacillus sphaericus, which was selected based on previous research. As proof of concept, the activity of bacterial spores after immobilization, the carbonatogenesity of the hydrogel encapsulated spores, the influence of the bio-agents on the hydrogel swelling properties, and the crack healing efficiency were investigated. Interestingly, no significant viability loss was observed after the immobilization process. The precipitation of CaCO3 in/on the hydrogel matrix by the encapsulated spores was demonstrated by thermogravimetric analysis (TGA). The swelling capacity of the hydrogel was slightly increased after incorporation of the bio-agents. In addition, the specimens combined with the bio-hydrogels showed an obvious superiority in crack healing efficiency, both with respect to the healing rate as well as the maximum healed crack width. A maximum crack width of about 0.5mm can be healed in the specimens containing bio-hydrogels within 7d, while no crack healing was observed in the reference specimens. The feasibility of using hydrogel immobilized bacteria ...
Hydrogel encapsulated bacterial spores for self-healing concrete: proof of concept
Wang, Jianyun (author) / Van Vlierberghe, Sandra (author) / Dubruel, Peter (author) / Verstraete, Willy (author) / De Belie, Nele (author) / De Belie, Nele / van der Zwaag, Sybrand / Gruyaert, Elke / Van Tittelboom, Kim / Debbaut, Brenda
2013-01-01
ICSHM 2013 : 4th international conference on self-healing materials ; ISBN: 9789082073706
Conference paper
Electronic Resource
English
DDC:
690
Self-healing concrete by use of microencapsulated bacterial spores
| Online Contents | 2014
Self-healing concrete by use of microencapsulated bacterial spores
| British Library Online Contents | 2014
Self-healing concrete by use of microencapsulated bacterial spores
| Elsevier | 2013