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  

Long-Term Self-Healing Capability of Cracked Microbial Mortar under Water Immersion-Ambient Exposure Conditions

作　　者：王立成[1] 邹凯 WANG Licheng;ZOU Kai(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,大连116024

出　　处：《硅酸盐通报》2025年第3期842-851,共10页Bulletin of the Chinese Ceramic Society

基　　金：辽宁省自然科学基金(2020-MS-100);辽宁省“兴辽英才计划”项目(XLYC2211006)。

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200μm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507.8μm。在1500 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。1500 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。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 selfhealing 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 200μm is over 80%.The maximum healed crack with a width of 507.8μm is observed.Furthermore,denser white precipitates are noted on the surface of those 1500 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 1500 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.

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 

分 类 号：TU528[建筑科学—建筑技术科学]