Self-Healing and Mechanical Properties of Bacterial ECC

Abstract

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

CLC Number:

TB332

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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