Characterization of Self-healing Cracks in Cement-based Materials Based on Labled Calcium Carbonate
CHEN Qinwen1,2,3, SU Yilin1,2,3, LI Min1,2,3,*, QIAN Chunxiang1,2,3,*
1 College of Materials Science and Engineering, Southeast University, Nanjing 211189, China 2 Research Institute of Green Construction Materials, Southeast University, Nanjing 211189, China 3 Key Laboratory of Microbial Technology in Building Materials Industry, Southeast University, Nanjing 211189, China
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.
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2021, Vol. 35 
