Microbial self-healing of cracks in cement-based materials and its influencing factors

doi:10.1007/s11709-023-0986-6

Front. Struct. Civ. Eng.

2023, Vol. 17

Issue (11) : 1630-1642 https://doi.org/10.1007/s11709-023-0986-6

Microbial self-healing of cracks in cement-based materials and its influencing factors

Xiaoniu YU¹, Qiyong ZHANG², Xuan ZHANG³, Mian LUO⁴(

)

¹. Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China
². College of Engineering and Technology, Southwest University, Chongqing 400715, China
³. School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212114, China
⁴. College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China

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Abstract

Cement-based materials are brittle and crack easily under natural conditions. Cracks can reduce service life because the transport of harmful substances can cause corrosion damage to the structures. This review discusses the feasibility of using microbial self-healing agents for crack healing. Tubular and spherical carriers can be used to load microbial self-healing agents and protect microbes, which prolongs the self-healing time. The area self-healing ratio, permeability, mechanical strength, precipitation depth method, numerical modeling, and ultrasonic method can be employed to identify the self-healing effect of cracks. Moreover, the self-healing mechanism is systematically analyzed. The results showed that microbial self-healing agents can repair cracks in cement-based materials in underground projects and dam gates. The difficulties and future development of self-healing cracks were analyzed. A microbial self-healing agent was embedded in the cement-based material, which automatically repaired the developing cracks. With the development of intelligent building materials, self-healing cracks have become the focus of attention.

Keywords cement-based materials cracks microbial self-healing agent mechanism intelligent building materials

Corresponding Author(s): Mian LUO

Just Accepted Date: 25 July 2023 Online First Date: 27 December 2023 Issue Date: 24 January 2024

Cite this article:

Xiaoniu YU,Qiyong ZHANG,Xuan ZHANG, et al. Microbial self-healing of cracks in cement-based materials and its influencing factors[J]. Front. Struct. Civ. Eng., 2023, 17(11): 1630-1642.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-023-0986-6
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I11/1630

Tab.1 Commonly used self-healing agents

Tab.2 Commonly used active repair agents

Fig.1 Microbial self-healing agents mineralizing to heal cracks [74,75]. (Reprinted from Applied Ocean Research, 118, Yu X, Rong H, Seawater based MICP cements two/one-phase cemented sand blocks, 102972, Copyright 2022, with permission from Elsevier.) (Reprinted from Journal of Building Engineering, 66, Yu X N, Xu Y D, OAs and CAB capture CO₂ and conversion to carbonates and its potential applications in civil engineering, 105904, Copyright 2023, with permission from Elsevier.)

Tab.3 Commonly used microorganisms in microbial self-healing agents

Tab.4 Price and types of calcium sources

Fig.2 Crack repair in old cement-based materials: (a) before repair; (b) after repair.

Fig.3 Microstructure of cracks in old cement-based materials repaired by spraying a MICP-based self-healing agent.

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