Biological Material in Self-healing Concrete
| Autor: | Yi-Tien Chen, 陳貽瑱 |
|---|---|
| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 The microcrack of concrete is almost inevitable phenomenon. If microcrack forms a continuous route, it will bring on the moisture or corrosive substances in the air into the concrete. That will cause the durability decrease of concrete. Not only domestic but foreign governments spend largely money on the repair of concrete cracks. Nowadays the mainly repair materials are environment unfriendly substances such as epoxy systems, acrylic resin or a silicon-based organic polymer. In addition, the different ratio of shrinkage and thermal expansion of these substances often makes the cracks or delamination between concrete substrate and the repair material. In this study, use Bacillus pasteurii which is environment-friendly and design series of tests to explore the self-healing behavior of concrete with biological material. The engineering property tests and microcrack observation are designed in this study. The engineering property tests include the compression test, permeability test and rapid chloride penetration test（RCPT） to realize that Bacillus pasteurii which is implanted in lightweight aggregates whether strengthen the bond interface zone, reduce permeability of the concrete, and thus enhance the strength of concrete or not. The microcrack observation is to understand the repair effect of Bacillus pasteurii implanted lightweight aggregates. XRD experiment is to confirm whether the repair substances produced by the Bacillus pasteurii. The results shows that biological materials are added to the concrete, due to Microbial induce carbonate precipitation （MICP） which can increase the strength of concrete, decrease the permeability of concrete. According to the deposition of calcium carbonate, not only the microcrack in concrete but the large crack generated by force can be repaired. It is worth mentioning that if the concrete with Bacillus pasteurii implanted lightweight aggregates which residual compressive strength (28 days curing) is even higher than the original strength of the concrete without Bacillus pasteurii. The above experiment results show that self-healing concrete developed by the study has the effect of self-healing indeed. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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