Self-Healing of Concrete Cracks by Ceramsite-Loaded Microorganisms
Protective carrier is essential for the self-healing of concrete cracks by microbially induced CaCO3 precipitation, owing to the harsh conditions in concrete. In this paper, porous ceramsite particles are used as microbial carrier. Heat treatment and NaOH soaking are first employed to improve the lo...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2018-01-01
|
| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/5153041 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832547477739274240 |
|---|---|
| author | Jing Xu Xianzhi Wang Junqing Zuo Xiaoyan Liu |
| author_facet | Jing Xu Xianzhi Wang Junqing Zuo Xiaoyan Liu |
| author_sort | Jing Xu |
| collection | DOAJ |
| description | Protective carrier is essential for the self-healing of concrete cracks by microbially induced CaCO3 precipitation, owing to the harsh conditions in concrete. In this paper, porous ceramsite particles are used as microbial carrier. Heat treatment and NaOH soaking are first employed to improve the loading content of the ceramsite. The viability of bacterial spores is assessed by urea decomposition measurements. Then, the self-healing efficiency of concrete cracks by spores is evaluated by a series of tests including compressive strength regain, water uptake, and visual inspection of cracks. Results indicate that heat treatment can improve the loading content of ceramsite while not leading to a reduction of concrete strength by the ceramsite addition. The optimal heating temperature is 750°C. Ceramsite particles act as a shelter and protect spores from high-pH environment in concrete. When nutrients and spores are incorporated in ceramsite particles at the same time, nutrients are well accessible to the cells. The regain ratio of the compressive strength increases over 20%, and the water absorption ratio decreases about 30% compared with the control. The healing ratio of cracks reaches 86%, and the maximum crack width healed is near 0.3 mm. |
| format | Article |
| id | doaj-art-04f57a03d9fd4359bbc9960506e9f6cd |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-04f57a03d9fd4359bbc9960506e9f6cd2025-02-03T06:44:32ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422018-01-01201810.1155/2018/51530415153041Self-Healing of Concrete Cracks by Ceramsite-Loaded MicroorganismsJing Xu0Xianzhi Wang1Junqing Zuo2Xiaoyan Liu3Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, Tongji University, Shanghai 201804, ChinaKey Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, Tongji University, Shanghai 201804, ChinaShanghai Construction Group Co., Ltd., Shanghai 200080, ChinaCollege of Mechanics and Materials, Hohai University, Nanjing 210098, ChinaProtective carrier is essential for the self-healing of concrete cracks by microbially induced CaCO3 precipitation, owing to the harsh conditions in concrete. In this paper, porous ceramsite particles are used as microbial carrier. Heat treatment and NaOH soaking are first employed to improve the loading content of the ceramsite. The viability of bacterial spores is assessed by urea decomposition measurements. Then, the self-healing efficiency of concrete cracks by spores is evaluated by a series of tests including compressive strength regain, water uptake, and visual inspection of cracks. Results indicate that heat treatment can improve the loading content of ceramsite while not leading to a reduction of concrete strength by the ceramsite addition. The optimal heating temperature is 750°C. Ceramsite particles act as a shelter and protect spores from high-pH environment in concrete. When nutrients and spores are incorporated in ceramsite particles at the same time, nutrients are well accessible to the cells. The regain ratio of the compressive strength increases over 20%, and the water absorption ratio decreases about 30% compared with the control. The healing ratio of cracks reaches 86%, and the maximum crack width healed is near 0.3 mm.http://dx.doi.org/10.1155/2018/5153041 |
| spellingShingle | Jing Xu Xianzhi Wang Junqing Zuo Xiaoyan Liu Self-Healing of Concrete Cracks by Ceramsite-Loaded Microorganisms Advances in Materials Science and Engineering |
| title | Self-Healing of Concrete Cracks by Ceramsite-Loaded Microorganisms |
| title_full | Self-Healing of Concrete Cracks by Ceramsite-Loaded Microorganisms |
| title_fullStr | Self-Healing of Concrete Cracks by Ceramsite-Loaded Microorganisms |
| title_full_unstemmed | Self-Healing of Concrete Cracks by Ceramsite-Loaded Microorganisms |
| title_short | Self-Healing of Concrete Cracks by Ceramsite-Loaded Microorganisms |
| title_sort | self healing of concrete cracks by ceramsite loaded microorganisms |
| url | http://dx.doi.org/10.1155/2018/5153041 |
| work_keys_str_mv | AT jingxu selfhealingofconcretecracksbyceramsiteloadedmicroorganisms AT xianzhiwang selfhealingofconcretecracksbyceramsiteloadedmicroorganisms AT junqingzuo selfhealingofconcretecracksbyceramsiteloadedmicroorganisms AT xiaoyanliu selfhealingofconcretecracksbyceramsiteloadedmicroorganisms |