Issue |
MATEC Web Conf.
Volume 403, 2024
SUBLime Conference 2024 – Towards the Next Generation of Sustainable Masonry Systems: Mortars, Renders, Plasters and Other Challenges
|
|
---|---|---|
Article Number | 03003 | |
Number of page(s) | 7 | |
Section | New Mortar Solutions | |
DOI | https://doi.org/10.1051/matecconf/202440303003 | |
Published online | 16 September 2024 |
Bacterially-promoted carbonation of lime-based building materials
1 Ghent University, Center for Microbial Ecology and Technology (CMET), Coupure Links 653, B-9000 Gent, Belgium
2 Ghent University, Magnel-Vandepitte Laboratory, Dept. of Structural Engineering and Building Materials, Technologiepark Zwijnaarde 60, B-9052, Gent, Belgium
3 University of Granada, Department of Mineralogy and Petrology, 18002, Granada, Spain
* Corresponding author: franco.grossogiordano@ugent.be
Lime-based binders, while historically significant, exhibit low strength and slow hardening, which has led to its replacement by cement. Hardening in lime-based materials occurs primarily through carbonation, whereby Ca(OH)2 reacts with atmospheric CO2 and produces CaCO3 cement. This study explores using bacterial additives to accelerate lime hardening by producing extra CO2. Three bacterial species were isolated and grown in liquid media. In a closed container, lime-mortar specimens were indirectly exposed to a cotton soaked in either bacterial suspension or water. Thermogravimetric analysis after 7 and 14 days indicated increased carbonation in cubes incubated with bacterial suspension, but not significantly. Subsequently, one bacterial suspension was mixed directly with lime. Progression of carbonation was tested with phenolphthalein and after 7, 14 and 21 days faster carbonation was seen in bacteria-containing pastes than those with only culture media. Overall, bacteria can carbonate lime materials but further optimization is needed for practical application.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.