摘要
微生物诱导碳酸钙沉积(MICP)是自然界中常见的现象,具有智能化、环保的优点,在混凝土裂缝修复领域有着较好的应用前景。然而,混凝土内部的高碱性环境会影响微生物的生长和矿化效率。本实验通过喷雾干燥技术获得微生物芽孢菌粉,采用糖衣包裹法制备出核-壳结构微生物自修复剂,研究其颗粒粒径与强度分布,微生物自修复混凝土的基本性能及其裂缝的自修复效果,并对裂缝的自修复机理进行了详细讨论。研究结果表明,核-壳结构微生物自修复剂的均质性较好,颗粒粒径为3.5~4.0 mm,单颗粒强度维持在75~85 N。此外,微生物自修复混凝土的基本性能和抗压强度均符合普通混凝土的技术标准,不影响其正常使用。28 d后,微生物自修复混凝土裂缝基本完全修复,修复产物主要是CaCO_(3)。
Microbial induced calcium carbonate precipitation(MICP)is a common phenomenon in nature,which has the advantages of intelligence and environmental protection and exhibits good application prospects in the field of concrete crack repair.However,the high alkaline environment inside the concrete can affect the growth and mineralization efficiency of microorganisms.Therefore,microbial spore powders were obtained by spray drying technology.The core-shell structure microbial self-healing agent was prepared via the sugar-coated method in this work,and then the particle size and strength distribution of microbial self-healing agent were studied.The crack healing efficiencies and properties of self-healing concrete were studied.Finally,the self-healing mechanism of cracks was discussed carefully.The experimental results showed that the homogeneity of the core-shell structure microbial self-healing agent was good,with the particle size of 3.5-4.0 mm,and the single particle strength maintained at 75-85 N.In addition,the basic performance and compressive strength of microbial self-healing concrete complied with relevant standards and regulations of ordinary concrete,which did not affect its normal use.After 28 d,microbial self-healing concrete cracks were basically completely repaired,and the healing product was CaCO_(3).
作者
黄小铁
周亮
周继辉
吴中太
HUANG Xiaotie;ZHOU Liang;ZHOU Jihui;WU Zhongtai(Liuzhou Polytechnic University,Liuzhou 545005,China;Guangxi Transportation Investment Group Liuzhou Expressway Operation Co.,Ltd.,Liuzhou 545005,China;School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《材料科学与工程学报》
北大核心
2025年第4期612-621,共10页
Journal of Materials Science and Engineering
基金
国家自然科学基金项目(11962001)
2024年度广西高校中青年教师科研基础能力提升项目(2024KY1095)。
关键词
芽孢
微生物自修复剂
混凝土性能
裂缝
自修复机理
Spore
Microbial self-healing agent
Concrete properties
Cracks
Self-healing mechanism
作者简介
黄小铁(1988-),女,广西柳州人,高级工程师,硕士,研究方向:建筑及装饰工程。E-mail:xiaotiehuang2024@163.com。
