Developing the solution of microbially induced CaCO3 precipitation coating for cement concrete

14th International Conference on Concrete Engineering and Technology

Tri Huynh, Nguyen Ngoc^1 ; Quynh Nhu, Nguyen^1 ; Khanh Son, Nguyen^1

Faculty of Materials Technology, Ho Chi Minh City University of Technology, VNU-HCM Building C4, 268 Ly Thuong Kiet street, District 10, Ho Chi Minh city, Viet Nam^1

关键词: Bacillus Subtilis;    Caco3 precipitations;    Carbonate precipitation;    Cement based material;    Concrete surface;    Material analysis;    Mortar specimens;    Sustainable solution;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/431/6/062006/pdf
DOI  :  10.1088/1757-899X/431/6/062006

来源: IOP

【 摘 要 】

The term of microbially induced calcium carbonate precipitation or biomineralization usually link to phenomenon of self-healing in cement-based material due to metabolism bacteria. In this paper, we investigated on the water sealing performance of MICP coating for concrete surface treatment. Prepared bacterial solution (Bacillus subtilis HU58 and cement paste) was painted on cement substrate. After curing several days under high humidity condition, thin layer 0.1-0.5 mm of precipitated product could be recognized by naked eyes. Material analysis of precipitated product revealed the presence of both calcite and aragonite mineral. In addition, result of water sealing test on coated mortar specimens helped us to clarify the positive effect of the MICP coating. From that, sustainable solution of bacteria-based coating for surface treatment of concrete structure can be opened for discussion.