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清华大学学报(自然科学版)  2019, Vol. 59 Issue (8): 601-606    DOI: 10.16511/j.cnki.qhdxxb.2019.22.016
  微生物岩土技术 本期目录 | 过刊浏览 | 高级检索 |
低碱胶凝材料负载微生物应用于混凝土的开裂自修复
徐晶, 王先志
同济大学 先进土木工程材料教育部重点实验室, 上海 201804
Self-healing of concrete cracks by microorganisms loaded in low-alkali cementitious material
XU Jing, WANG Xianzhi
Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China
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摘要 利用微生物诱导成矿实现混凝土的开裂自修复,面临的首要问题是对菌体进行负载保护,而载体材料是关键。该文选取了掺入质量分数20%硅灰的硫铝酸盐水泥作为低碱性胶凝负载材料,通过对胶凝材料的pH值以及凝结时间的优化,并评价负载后细菌芽孢的活性,探索出了一个有效的负载体系。混凝土开裂自修复的测试结果表明:借助该负载体系,28 d可使最大约322 μm宽的混凝土裂缝得以完全修复。修复后,混凝土抗压强度恢复到损伤前的84%,水密闭性恢复至未损伤时的水平。
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徐晶
王先志
关键词 混凝土裂缝微生物自修复载体    
Abstract:The primary issue for self-healing of concrete cracks by microbially induced mineralization is protection of the bacteria and the key to protecting the bacteria is the carrier material selection. This paper used calcium sulphoaluminate cement with 20% silica fume as a low-alkali binder type carrier material. An effective loading method was developed by regulating the binder pH and setting time through evaluations of the bacterial spore activity in this carrier. The concrete crack self-healing was successful up to a maximum crack width of about 322 μm that could be healed after 28 days. After the self-healing, the concrete compressive strength recovered up to 84% of the original strength with the water tightness completely restored.
Key wordsconcrete    crack    microorganism    self-healing    carrier
收稿日期: 2019-02-25      出版日期: 2019-08-05
基金资助:上海市自然科学基金项目(17ZR1441900);中央高校基本科研业务费项目(22120180269);国家重点研发计划(2016YFC0700802-05)
引用本文:   
徐晶, 王先志. 低碱胶凝材料负载微生物应用于混凝土的开裂自修复[J]. 清华大学学报(自然科学版), 2019, 59(8): 601-606.
XU Jing, WANG Xianzhi. Self-healing of concrete cracks by microorganisms loaded in low-alkali cementitious material. Journal of Tsinghua University(Science and Technology), 2019, 59(8): 601-606.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2019.22.016  或          http://jst.tsinghuajournals.com/CN/Y2019/V59/I8/601
  表1 载体胶凝材料中营养物质及细菌掺量
  表2 自修复混凝土试件材料配比
  图1 不同配比下大水灰比水泥浆体滤液的pH 值
  图2 芽孢及不同掺量的营养物质对胶凝材料凝结时间的影响
  图3 芽孢活性检验分析结果
  图4 负载芽孢后的修复粉剂颗粒微观形貌
  图5 混凝土试件表面裂缝自修复前后对比
  图6 裂缝修复的统计分析
  图7 混凝土试件自修复前后的毛细吸水率
  图8 混凝土试件自修复前后的抗压强度
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