| 摘要: |
| 用以石膏为细菌载体及以乳酸钙、尿素为底物的自修复剂,基于微生物诱导碳酸钙沉淀（MICP）技术实现了珊瑚砂砂浆裂缝的自修复,验证了石膏作为细菌载体修复珊瑚砂砂浆裂缝的可行性,探讨了自修复剂配比和养护方式对自修复效果的影响,分析了裂缝区生成物的矿物成分及形态.结果表明：掺入石膏为细菌载体的自修复剂后,试样裂缝自修复效果良好;裂缝生成物主要是方解石和球霰石型碳酸钙;当含菌载体和底物掺量均为30%时,试样裂缝有较好的自修复效果,同时对珊瑚砂砂浆强度影响相对较小. |
| 关键词: 石膏 微生物诱导碳酸钙沉淀 细菌载体 珊瑚砂砂浆 自修复 |
| DOI：103969/j.issn.1007 9629202104003 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51874144，51978292，52178334)；福建省自然科学基金资助项目(2019J01048) |
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| New Bacterial Carrier for the Crack Self healing in Coral Sand Mortar Based on MICP |
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LIU Shiyu, YU Jin, LIU Wenqiang, CAI Yanyan, TU Bingxiong
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Fujian Research Center for Tunneling and Urban Underground Space Engineering, Huaqiao University, Xiamen 361021, China
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| Abstract: |
| A self healing agent was prepared using gypsum as a bacterial carrier, calcium lactate and urea as substrate. Microbially induced carbonate precipitation(MICP) technology was used to achieve self healing of coral sand mortar cracks. The feasibility of using gypsum as a bacterial carrier to repair cracks in coral sand mortar was verified. The effects of self healing agent content and curing method on self healing performance were investigated. The mineral composition and morphology of the products in the crack were analyzed. The results show that cracks of the samples added with gypsum carrier have good self healing performance. The calcium carbonate produced in the cracks is mainly calcite and vaterite. When the content of carrier and substrate is 3%, cracks of the sample have good self healing performance, and the impact on the strength of coral sand mortar is relatively small. |
| Key words: gypsum microbially induced carbonate precipitation bacterial carrier coral sand mortar self healing |
