微生物自修复混凝土裂缝自修复动力学模型

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Abstract To establish a unified mathematical model for the detailed description of the self-healing process of self-healing concrete, the control group and experimental group specimens were formed, and the self-healing process of concrete was recorded by water infiltration method and image processing technology, the preliminary fitting results show that the area repair rate is in direct proportion to the resistance to water permeating repair ratio. Based on the first-order kinetic model, the crack self-healing kinetic model of microbial self-healing concrete is deduced. The data fitting results based on the model show that the area repair rate of the control group is less than the resistance to water permeating repair ratio, the difference between them increases first and then tends to be stable, the area repair rate of the experimental group is larger than resistance to water permeating repair ratio, and the difference between them increases first and then decreases. After the difference between the experimental group and the control group, the kinetic model of healing agent can be obtained. After further derivation, the healing rate model of the healing agent can be obtained. After analysis, it is found that the effect time of microbial healing agent on the crack self-healing is 27—32 d.

Key words： microbial self-healing concrete area repair rate resistance to water permeating repair ratio kinetic model

Published: 08 January 2021

CLC number:

TU528

Fund:This work was supported by the National Nature Science Foundation of China (51738003).

About author:: Zekang Jin, postgraduate of the School of Materials Science and Engineering, Southeast University. From September 2014 to June 2018, he obtained a bachelor's degree in polymer materials and engineering from Anhui University of Science and Technology. In September 2018, he entered Southeast University to study for a master's degree in materials engineering. The research direction is microbial self-healing concrete.Chunxiang Qian, nominated by the Chinese Association for Science and Technology in 2019 as an effective candidate of the Department of Chemical Engineering, Metallurgy and Materials of the Chinese Academy of Engineering, an expert with special government allowances from the State Council, winner of the National Science and Technology Progress Award, a distinguished professor of Southeast University, a distinguished professor of Jiangsu, the Ministry of Education, New Century Excellent Talents, 333 engineering technology leading talents in Jiangsu Province, peak talents in six industries in Jiangsu Province, currently director of the Green Building Materials Research Center of Southeast University, and director of the Key Laboratory of Microbial Mineralization Technology in China's Building Materials Industry.Currently serving as the deputy director of the Expert Committee of the Solid Waste and Ecological Materials Branch of the Chinese Ceramic Society, the deputy director of the High Strength and High Performance Concrete Committee of the Chinese Ceramic Society, the chairmanof the Self-Protecting Concrete Materials and Engineering Technology Branch of the China Concrete and Cement Products Association, and the project quality And the vice chairman of the Standardization Branch, the director of the China Institute of Concrete, the chairman of the Jiangsu Institute of Ceramics, the member of the High Strength and High Performance Concrete Committee of the China Civil Engineering Society, the member of the Academic Committee of the Technology Center of China State Construction Corporation, the member of the Fiber Cement and Concrete Committee, Member of RILEM China Chapter, Member of ACI China Chapter, Cement and Concrete Research, Southeast University Journal, Journal of Southeast University and other academic journals, member of the Expert Committee of China Construction Technology Center, Director of the Technical Committee of the National and Local Joint Engineering Laboratory of Transportation Civil Engineering Materials Member of the Academic Committee of the British Hub for Biotechnology in the Built Environment (HBBE).

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Cite this article:

JIN Zekang,ZHANG Xuan,LI Min, et al. Crack Self-healing Kinetic Model of Microbial Self-healing Concrete[J]. Materials Reports, 2020, 34(Z2): 194-200.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2020/V34/IZ2/194

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