基于MICP的珊瑚砂砂浆裂缝自修复新型细菌载体  

New Bacterial Carrier for the Crack Self-healing in Coral Sand Mortar Based on MICP

作　　者：刘士雨[1,2] 俞缙[1] 刘文强 蔡燕燕[1] 涂兵雄[1] LIU Shiyu;YU Jin;LIU Wenqiang;CAI Yanyan;TU Bingxiong(Fujian Research Center for Tunneling and Urban Underground Space Engineering,Huaqiao University,Xiamen 361021,China;Key Laboratory for Intelligent Infrastructure and Monitoring of Fujian Province,Huaqiao University,Xiamen 361021,China)

机构地区：[1]华侨大学福建省隧道与城市地下空间工程技术研究中心,福建厦门361021 [2]华侨大学福建省智慧基础设施与监测重点实验室,福建厦门361021

出　　处：《建筑材料学报》2021年第4期687-693,共7页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51874144,51978292,52178334);福建省自然科学基金资助项目(2019J01048)。

摘　　要：用以石膏为细菌载体及以乳酸钙、尿素为底物的自修复剂,基于微生物诱导碳酸钙沉淀(MICP)技术实现了珊瑚砂砂浆裂缝的自修复,验证了石膏作为细菌载体修复珊瑚砂砂浆裂缝的可行性,探讨了自修复剂配比和养护方式对自修复效果的影响,分析了裂缝区生成物的矿物成分及形态.结果表明:掺入石膏为细菌载体的自修复剂后,试样裂缝自修复效果良好;裂缝生成物主要是方解石和球霰石型碳酸钙;当含菌载体和底物掺量均为3.0%时,试样裂缝有较好的自修复效果,同时对珊瑚砂砂浆强度影响相对较小.A self-healing agent was prepared using gypsum as a bacterial carrier,calcium lactate and urea as substrate.Microbially induced carbonate precipitation(MICP)technology was used to achieve self-healing of coral sand mortar cracks.The feasibility of using gypsum as a bacterial carrier to repair cracks in coral sand mortar was verified.The effects of self-healing agent content and curing method on self-healing performance were investigated.The mineral composition and morphology of the products in the crack were analyzed.The results show that cracks of the samples added with gypsum carrier have good self-healing performance.The calcium carbonate produced in the cracks is mainly calcite and vaterite.When the content of carrier and substrate is 3%,cracks of the sample have good self-healing performance,and the impact on the strength of coral sand mortar is relatively small.

关 键 词：石膏 微生物诱导碳酸钙沉淀 细菌载体 珊瑚砂砂浆 自修复 

分 类 号：TU43[建筑科学—岩土工程]