微生物沉积优化与混凝土自修复条件的相关性研究

doi:10.11896/cldb.20090182

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Abstract This paper aimed at correlating the optimum conditions of ureolytic type microbially-induced CaCO₃ precipitation (MICP) with the prerequisites for self-healing concrete. Orthogonal experiments of a combination of factors contributing to the MICP process were firstly designed and performed. Results show that initial cell density and Ca²⁺ concentration were highly significant factor and significant factor respectively. Besides, high initial cell density (1×10⁸ cells/mL) together with relatively lower Ca²⁺ concentration (50 mmol/L) favored microbial precipitation. The se-cond part of this study was associated with dissolution tests to simulate the dissolving behavior of urea and calcium in the concrete crack solution, since the dissolving of healing agents in crack is the prerequisite for self-healing concrete. By an addition of urea and Ca(NO₃)₂ with constant mass ratio of 2∶3 in concrete, the highest values of the estimated urea concentration (345 mmol/L) and Ca²⁺ concentration (44 mmol/L) dissolved in cracks were close to the optimum values found by orthogonal experiments. Although the addition of urea and Ca(NO₃)₂ would not have a negative impact on the mechanical properties of concrete, direct mixing is not recommended due to the low utilization efficiency of incorporated healing agents for self-healing concrete.

Key words： bacteria ureolysis calcium carbonate optimization self-healing

Published: 25 November 2021 Online: 2021-12-13

CLC number:

TU520

Fund:National Key R & D Program of China (2019YFC1906203) and State Key Laboratory of Silicate Materials for Architectures(Wuhan University of Technology)(SYSJJ2019-04).

About author: Jing Xureceived his Ph.D. degree in materials from Tongji University in March 2009. He is currently an associate professor in Tongji University and focusing on the research of advanced civil engineering materials. His research interests are microbial self-healing concrete, nanotechnology in cement-based materials, and corrosion and protection of reinforced concrete.

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	XU Jing
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Cite this article:

XU Jing,TANG Yihong,WANG Xianzhi. Study on the Correlation Between the Optimum Conditions of Microbially-induced CaCO₃ Precipitation and the Prerequisites for Self-healing Concrete[J]. Materials Reports, 2021, 35(22): 22039-22044.

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http://www.mater-rep.com/EN/10.11896/cldb.20090182 OR http://www.mater-rep.com/EN/Y2021/V35/I22/22039

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