Journal
AMB EXPRESS
Volume 12, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1186/s13568-022-01403-z
Keywords
Cyanobacteria; Synechocystis pevalekii; Calcium carbonate precipitation; Sand consolidation; Compressive strength; Water absorption; Mortar
Categories
Funding
- Department of Biotechnology, Ministry of Science and Technology [BT/PR27190/BCE/8/1428/2017]
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Microbially induced calcium carbonate precipitation (MICCP) is an eco-friendly technique that enhances the structural properties and durability of cementitious materials. This study investigates the use of photoautotrophic bacteria Synechocystis pevalekii BDHKU 35101 for calcium carbonate precipitation and its effects on the mechanical and permeability properties of cement mortar. The results show that live cells of S. pevalekii significantly enhance the compressive strength and reduce water absorption levels in mortar specimens.
Microbially induced calcium carbonate precipitation (MICCP) is considered a novel eco-friendly technique to enhance the structural properties of cementitious-based material. Maximum studies have emphasized using ureolytic bacteria to improve the durability properties of building structures. In this study, the role of photoautotrophic bacteria Synechocystis pevalekii BDHKU 35101 has been investigated for calcium carbonate precipitation in sand consolidation, and enhancing mechanical and permeability properties of cement mortar. Both live and UV-treated S. pevalekii cells were used to treat the mortar specimens, and the results were compared with the control. The compressive strength of mortar specimens was significantly enhanced by 25.54% and 15.84% with live and UV-treated S. pevalekii cells at 28-day of curing. Water absorption levels were significantly reduced in bacterial-treated mortar specimens compared to control at 7 and 28-day curing. Calcium carbonate precipitation was higher in live-treated cells than in UV-treated S. pevalekii cells. Calcium carbonate precipitation by S. pevalekii cells was confirmed with SEM-EDS, XRD, and TGA analysis. These results suggest that S. pevalekii can serve as a low-cost and environment friendly MICCP technology to improve the durability properties of cementitious materials.
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