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The Effects of Calcite-Producing Bacteria on the Engineering Properties of Alkali-Activated Composite Mortars

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Iranian Journal of Science and Technology, Transactions of Civil Engineering Aims and scope Submit manuscript

Abstract

This study aims to explore the impact of calcium carbonate-producing bacteria on the engineering properties of alkali-activated composite mortars (AACMs). This study conducted an investigation on the mechanical properties, water absorption, rapid chloride ion permeability, ultrasonic pulse velocity, and mercury porosimetry of AACMs with varying cell concentrations of microbial Bacillus subtilis (BS) per milliliter (103, 105, and 107 cells/ml). Regarding the beneficial effects of improvement agents on concrete behavior, the effect of microbial-induced carbonate precipitation (MICP) in AACMs, which is an environmentally friendly solution for engineering properties, was investigated. AACMs with three different cell concentrations of Bacillus subtilis (103, 105, and 107 cells/ml) were investigated. Among these, the sample featuring 105 cells/ml exhibited the most favorable flexural and compressive strength. 7 and 28 days flexural strengths of 105 cells/ml added AACMs samples were 8.16 and 23.80%, while their compressive strengths were 17.70 and 22.65%, respectively. A decrease of approximately 12.27% was observed in water absorption in 28-day AACMs samples, and a decrease of 24.70% was observed in rapid chloride ion permeability. It was seen in the study that BS bacteria species caused a noticeable improvement in the performance of AACMs.

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Acknowledgements

“This work was supported by Scientific Research Projects Coordination Unit of Kırıkkale University. Project number 2021/064”.

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This study was conducted solely by the author. The research concept, experimental design, data collection, analysis, and interpretation are based entirely on the author's personal contributions. The author took full responsibility for the writing and editing of the manuscript. No external assistance was sought, and all sources have been accurately cited. This statement confirms that the study is the original work of the author and that there are no conflicts of interest.

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Correspondence to Ahmet Filazi.

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The authors state that this article does not contain any studies with human participants or animals performed by any of the authors.

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Filazi, A. The Effects of Calcite-Producing Bacteria on the Engineering Properties of Alkali-Activated Composite Mortars. Iran J Sci Technol Trans Civ Eng (2024). https://doi.org/10.1007/s40996-024-01456-z

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  • DOI: https://doi.org/10.1007/s40996-024-01456-z

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