Microbially Induced Calcium Carbonate Precipitation Improves the Early-ageMechanical Performance and Self-healing Effect of Cement-based Materials
QIAN Chunxiang1,2, FENG Jianhang1, SU Yilin1,2
1 College of Materials Science and Engineering, Southeast University, Nanjing 211189 2 Research Institute of Green Construction Materials, Southeast University, Nanjing 211189
Abstract: Microbially induced calcium carbonate precipitation is a promising technology used in materials in civil engineering, recent researches have showed its broad application prospects in self-healing cement-based materials. One type of carbon-fixing bacteria which can catalyze mine-ralization reaction was adopted. Bacterial solution with nutrients and calcium sources was incorporated into cement-based materials before cas-ting. The results revealed that compressive strength and flexural strength of mortars with bacteria were improved after 14 d and the pore structure was denser, calcite was also found in the surface and inner of mortars by using DTA-TG and SEM. Besides, cracks with 0.1—0.2 mm width were made after 7 d standard curing and mineralization environment was imitated to investigate its healing effect. The results showed that cracks in mortars with bacterial solution were nearly completely repaired after 14 d. By using SEM and EDS, calcite and aragonite crystals were found in the cracks.
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2019, Vol. 33 
