微生物诱导碳酸钙提高水泥基材料的早期力学性能及自修复效果

doi:10.11896/cldb.18050077

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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.

Key words： microbiology calcium carbonate self-healing materials cracks mechanical performance

Published: 31 May 2019

CLC number:

Q939.99

Fund:This work was financially supported by the National Natural Science Foundation of China (51738003), Jiangsu University Student Innovation Expe-rience Project (201710286070X).

About author:: Chunxiang Qianreceived 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 bacte-rial smart concrete; bio-cement; low-carbon cementitious materials and green energy saving building mate-rials.

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	QIAN Chunxiang
	FENG Jianhang
	SU Yilin

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QIAN Chunxiang,FENG Jianhang,SU Yilin. Microbially Induced Calcium Carbonate Precipitation Improves the Early-ageMechanical Performance and Self-healing Effect of Cement-based Materials[J]. Materials Reports, 2019, 33(12): 1983-1988.

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http://www.mater-rep.com/EN/10.11896/cldb.18050077 OR http://www.mater-rep.com/EN/Y2019/V33/I12/1983

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