基于碳酸钙标记的水泥基材料裂缝自修复表征

doi:10.11896/cldb.20060298

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Abstract In order to characterize the crack repair depth of mocrobial self-healing cement-based materials, two methods were proposed to characterize calcium carbonate, the mineralized product of microorganisms. One method was to adsorb Cu²⁺ by biological calcium carbonate and form basic copper carbonate mark on its surface. Another method was to label the mineralized products by doping Eu³⁺ to form CaCO₃:Eu³⁺. XRD was used to analyze biocarbonate before and after labeling in solution and cement-based materials. Fluorescence excitation and emission spectroscopy were used to analyze the calcium carbonate doped with Eu³⁺. X-CT was used to characterize the cement-based materials labeled by two methods. The results showed that: under the condition of 12.5 mg/mL Cu²⁺,25 ℃, and 3 h, the adsorption effect of Cu²⁺ labeled biocarbonate was the best. Under the condition of 2% Eu³⁺,45 ℃ and 48 h, the effect of labeling biocarbonate with Eu³⁺ was best. The evaluation results of the two methods on the repair depth were 3 mm,which were consistent with the results of thermogravimetric analysis. By adsorption of Cu²⁺ and doping of Eu³⁺, the products can be calibrated and the repair depth of cement-based materials can be characterized with good accuracy.

Key words： biological calcium carbonate calibration of repair products ion doping fracture characterization of cement-based materials

Published: 03 August 2021

CLC number:

TU526

Fund:Key Project of National Natural Science Foundation of China (51738003).

About author:: Qinwen Chen received her B.S. degree in June 2018 from Nanjing Forestry University in engineering. She is currently pursuing her M.A. degree at the College of Materials Science and Engineering, Southeast University under the supervision of Prof. Min Li and Chunxiang Qian. Her research has focused on the intersection of microbial self-repairing cementitious material.
Min Li received her Ph.D.degree in Southeast University in 2006. She is currently a professor in Southeast University. Her research interests are phase change thermal storage materials; high performance thermal insulation materials; energy saving intelligent materials.
Chunxiang Qian received her Ph.D.degree in Nanjing Tech University in 1992. She is currently a professor in Southeast University and director of Research Center on Green Building and Construction Materials.Her research interests are high performance and bacterialsmart concrete; bio-cement; low-carbon cementitious materials and green energy saving building materials.

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	CHEN Qinwen
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Cite this article:

CHEN Qinwen,SU Yilin,LI Min, et al. Characterization of Self-healing Cracks in Cement-based Materials Based on Labled Calcium Carbonate[J]. Materials Reports, 2021, 35(14): 14045-14051.

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http://www.mater-rep.com/EN/10.11896/cldb.20060298 OR http://www.mater-rep.com/EN/Y2021/V35/I14/14045

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