| 摘要: |
| 针对巴氏生孢八叠球菌作为生物愈合剂用于混凝土修复可能面临的复杂环境，开展了强碱耐受性、尿素浓度适应性、温度适应性等试验，考察了不同环境下的细菌活性与碳酸钙产量.结果表明：混凝土内部的强碱环境逼近或可能超出巴氏生孢八叠球菌的强碱耐受极限；细菌活性随尿素浓度与温度升高而升高，推荐愈合剂尿素浓度为06mol/L，建议夏季施工.细菌尿素醋酸钙愈合剂体系产物为球霰石，该体系可用于混凝土裂缝修补. |
| 关键词: 混凝土 裂缝 愈合剂 巴氏生孢八叠球菌 活性 |
| DOI：103969/j.issn.1007 9629201803022 |
| 分类号: |
| 基金项目: |
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| Activity Investigation of Sporosarcina Pasteurii as Concrete Crack Healing Agent |
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CHEN Xin1, HAN Yixuan1, ZHANG Guorong1, MA Cong2, ZHU Xiaojun3
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1.State Key Laboratory of Safety and Health for InService Long Span Bridges, JSTI Group, Nanjing 211112, China;2.School of Civil Engineering, Central South University, Changsha 410075, China;3.College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
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| Abstract: |
| When Sporosarcina pasteurii serves as bio healing agent of concrete, it is inevitably exposed to a complex environment. In order to study the bacteria activity and calcium carbonate production of Sporosarcina pasteurii in different conditions, experiments such as strong alkaline tolerance, urea concentration adaptability and temperature adaptability were conducted. Results show that the strong alkaline environment in concrete is close to, or even higher than, the limit of alkaline tolerance of the bacteria. Moreover, bacteria activity would be enhanced as urea concentration and temperature increase. It is recommended that the urea concentration in healing agent should be 06mol/L. Additionally, optimal application time of the healing agent is in summer. Results prove that the production of Sporosarcina pasteurii urea calcium acetate system is vaterite. This system can be used for concrete crack healing. |
| Key words: concrete crack healing agent Sporosarcina pasteurii activity |
