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Title |
Investigation of Microorganism-Based Autonomous Crack Healing Agent and Full-scale Verification of Crack Healing
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Authors |
유연준(Yeon-Jun Yoo) ; 이병재(Byung-Jae Lee) ; 양주경(Joo-Kyoung Yang) ; 이윤(Yun Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2023.27.6.138 |
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Keywords |
자발적 균열치유 콘크리트; 생체광물 형성 작용; 탄산칼슘; 균열치유작용; 미생물; 내생포자 Autonomous healing concrete; Biomineralization; Calcium carbonate; Crack healing; Microorganism; Endospore |
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Abstract |
In this study, the crack healing performance of each crack healing agent manufacturing method was analyzed by adding crack healing agents in the form of alginate gel and spore suspension inoculated with endospores of calcium carbonate-forming bacteria to mortar. In addition, by applying it to an full-scale structure in the form of a box-type culvert, we attempted to create an environment in which the developed crack healing agent can be applied not only to a laboratory environment but also to an actual field. The crack healing agent using the dry heat drying method showed crack healing performance, but in the case of the freeze drying method, many spores were killed by freeze hardening and therefore the crack healing performance was lost. As a result of SEM and XRD pattern analysis of the presumed crack healing material extracted from the crack of a full-scale structure, it was found to be calcite, one of the calcium carbonate crystals produced by microorganisms applied to the crack healing agent. In conclusion, it was found that the crack healing by microorganisms can be implemented in a real structure.
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