Long-Term Self-Healing Efficiency of Bioconcrete Based on Integrated Sulfate- and Nitrate-Reducing Bacterial Granules
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 9
Abstract
This study evaluated the mechanical properties and self-healing performance of freshly casted and 19-month-aged bioconcrete samples with integrated sulfate-reducing bacteria (SRB) and nitrate-reducing bacteria (NRB) granules that were cultivated in an upflow anaerobic sludge blanket (UASB) reactor with synthetic wastewater. The 28-day compressive strength fulfilled the design requirement of 50 MPa. The apparent volume of permeable voids (AVPV) of fresh and aged bioconcrete met the limit of 13%. The self-healing ability was determined by exposing cracked bioconcrete to water media such as glucose, calcium acetate, tap water, and wastewater, which have shown calcite deposition in fresh and aged samples. The highest amount of calcite deposition was seen on fresh samples after glucose exposure () and on aged bioconcrete after calcium acetate exposure (). Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS/XRD) results demonstrated that SRB/NRB granules survived mortar integration and deposition of calcite in both fresh and aged samples. The water permeability and acid resistance of bioconcrete samples were correlated to the amount of deposited calcite.
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
Kirthi Chetty receives the support from a University of Wollongong PhD scholarship and the Australian Nuclear Science and Technology Organization (ANSTO) Industry Foundations Scholarship. Guangming Jiang was the recipient of an Australian Research Council DECRA Fellowship (DE170100694).
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Journal of Materials in Civil Engineering
Volume 35 • Issue 9 • September 2023
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© 2023 American Society of Civil Engineers.
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Received: Jul 5, 2022
Accepted: Feb 15, 2023
Published online: Jun 24, 2023
Published in print: Sep 1, 2023
Discussion open until: Nov 24, 2023
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