Authors: Zhu Tingting*, University of Toronto - Mississauga, Maria Dittrich, University of Toronto Scarborough
Topics: Environmental Science, Earth Science, Physical Geography
Keywords: Microbial carbonate precipitation, CO2 sequestration, mortar restoration
Session Type: Poster
Presentation File: No File Uploaded
Cyanobacterial carbonate precipitation has demonstrated its potential in enhancing the durability of mortar. Cells, EPS and newly precipitated carbonates greatly impact the performance of mortar. The initial influence resides in the interface of microbes and mortar. Therefore, the effectiveness of the mortar restoration can be regulated by the percentage of surface area covered by cells. This study analyzed the cell coverage on mortar surface using scanning electron microscope and fluorescence microscope. Results show the initial cell coverage was 15% and 18% in the presence of live and UV-killed cells respectively, and the desorption mainly occurred during the first day. In addition, cells preferably attached to cement paste than sand grains, and the difference was 1 order of magnitude. The EDS analyses and Raman mapping indicate that cells and EPS were able to use atmospheric CO2 to precipitate carbonates such as aragonite and vaterite on the surface of mortar. This offers possibility of sequestrating CO2 in mortar.
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