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.
徐晶, 唐一洪, 王先志. 微生物沉积优化与混凝土自修复条件的相关性研究[J]. 材料导报, 2021, 35(22): 22039-22044.
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. Materials Reports, 2021, 35(22): 22039-22044.
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2021, Vol. 35 
