细菌ECC的自愈合及力学性能研究

摘要/Abstract

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。

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

Abstract: 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.

Key words: engineered cementitious composite, biomineralization, self-healing, mechanical property, MICP technology, Bacillus pasteurii

中图分类号:

TB332

孙溪晨, 陈柄丞, 汪洋, 冯君. 细菌ECC的自愈合及力学性能研究[J]. 硅酸盐通报, 2023, 42(6): 1960-1969.

SUN Xichen, CHEN Bingcheng, WANG Yang, FENG Jun. Self-Healing and Mechanical Properties of Bacterial ECC[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 1960-1969.

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