细菌ECC的自愈合及力学性能研究  

Self-Healing and Mechanical Properties of Bacterial ECC

作　　者：孙溪晨 陈柄丞 汪洋 冯君[1] SUN Xichen;CHEN Bingcheng;WANG Yang;FENG Jun(National Key Laboratory of Transient Physics,Nanjing University of Science&Technology,Nanjing 210094,China;School of Environmental and Biological Engineering,Nanjing University of Science&Technology,Nanjing 210094,China;Institute of Structural Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]南京理工大学瞬态物理国家重点实验室,南京210094 [2]南京理工大学环境与生物工程学院,南京210094 [3]浙江大学结构工程研究所,杭州310058

出　　处：《硅酸盐通报》2023年第6期1960-1969,1979,共11页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(11902161);江苏省科技副总项目(FZ20211642)。

摘　　要：微生物诱导碳酸钙沉淀(MICP)技术已被广泛应用于水泥基材料改性中,以实现其微裂纹自愈合。工程水泥基复合材料(ECC)具有受拉细密多裂缝特性,可以掺入巴氏芽孢杆菌微生物来获得基于MICP技术原理的自愈合ECC。结合单轴压缩、单轴拉伸和SEM、XRD测试,对细菌ECC的力学性能及其自愈合性能开展试验研究。结果表明:MICP技术使细菌ECC具有良好的自主愈合能力,并能在一定程度上恢复细菌的ECC力学性能;自修复养护28 d后,细菌ECC抗压强度恢复了9.44%,极限抗拉强度恢复了15.4%,拉伸应变提高了21.3%,裂缝填充物为球霰石形貌的碳酸钙,本研究旨在获得一种基于MICP技术原理下具有强自愈合能力的新型细菌ECC。Microbial induced calcium carbonate precipitation(MICP) technology has been widely used in the modification of cement-based materials to achieve self-healing of microcracks.Engineered cementitious composite(ECC) has the characteristic of fine and dense cracks under tension,and Bacillus pasteurii microorganisms were added to obtain self-healing ECC based on MICP technology mechanism.The mechanical properties and self-healing properties of bacterial ECC were studied by uniaxial compressive,uniaxial tension,SEM and XRD tests.The results show that MICP technology makes that bacterial ECC has a good self-healing ability and restores mechanical property in some degree.After 28 d incubation and bioremediation,compressive strength of bacterial ECC recovers by 9.44%,ultimate tensile strength recovers by 15.4%,and tensile strain increases by 21.3%.The crack filler is calcium carbonate with vaterite morphology.This study aims to obtain a new type of bacterial ECC with strong self-healing ability based on the MICP technology mechanism.

关 键 词：工程水泥基复合材料 生物矿化 自愈合 力学性能 MICP技术 巴氏芽孢杆菌 

分 类 号：TB332[一般工业技术—材料科学与工程]