水浸-室内环境下开裂微生物砂浆的长期修复能力试验研究

摘要/Abstract

摘要： 要通过微生物诱导碳酸钙沉淀(MICP)实现修复混凝土裂缝的目标,应保证掺入混凝土的微生物具备长期修复能力。采用裂缝测量、X射线衍射(XRD)、能量色散X射线光谱(EDS)和扫描电子显微镜(SEM)等方法,研究了掺有假坚强芽孢杆菌的微生物砂浆试件在水浸-室内环境条件下的长期修复能力。试验结果显示,经150 d水浸后,初始裂缝宽度小于200 μm的试件在经过12 d修复后,裂缝面积修复率超过80%,最大裂缝修复宽度达到507.8 μm。在1 500 d龄期试件表面观察到更致密的白色沉淀,但进一步减小裂缝宽度的效果有限。1 500 d龄期试件的锯切面上观察到了白色沉淀,证明假坚强芽孢杆菌在砂浆中具备长期修复能力。通过XRD、EDS和SEM分析发现,微生物诱导生成的方解石是裂缝内的主要自修复产物。

关键词: 微生物诱导碳酸钙沉淀, 水泥基材料, 自修复, 裂缝, 假坚强芽孢杆菌, 微观形貌

Abstract: To ensure the long-term self-healing capability of microorganisms is crucial for repairing cracked concrete structures through microbially induced calcium carbonate precipitation (MICP) technology. The long-term microbial self-healing capabilities of cracked mortar mixed with Bacillus Pseudofirmus, exposed to water immersion-ambient exposure conditions, were studied by means of comprehensive utilization of crack geometric measurement, as well as XRD, EDS, and SEM analyses. The experimental results reveal that after a 150 d water immersion period, the crack area repair ratio of the samples with initial width below 200 μm is over 80%. The maximum healed crack with a width of 507.8 μm is observed. Furthermore, denser white precipitates are noted on the surface of those 1 500 d samples, but with a limited efficiency in further reducing crack width. However, the white precipitate observed on the newly saw-cut section of a 1 500 d sample provides evidence that Bacillus Pseudofirmus within the mortar has long-term self-healing capability. The results of XRD, EDS, and SEM analyses confirm that the predominant self-healing product within the cracks is microbially induced calcite.

Key words: microbially induced calcium carbonate precipitation, cementitious material, self-healing, crack, Bacillus Pseudofirmus, micromorphology

中图分类号:

TU528

王立成, 邹凯. 水浸-室内环境下开裂微生物砂浆的长期修复能力试验研究[J]. 硅酸盐通报, 2025, 44(3): 842-851.

WANG Licheng, ZOU Kai. Long-Term Self-Healing Capability of Cracked Microbial Mortar under Water Immersion-Ambient Exposure Conditions[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 842-851.

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