Long-Term Corrosion Monitoring of Bacterially Healed Concrete Using Electrochemical and Ultrasonic Techniques
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 7
Abstract
Bacterial biocementation has been shown to have the unique capability of healing cracks in concrete. However, there is a concern that the materials used in biocement may cause corrosion. This paper reports the performance of bacterially healed reinforced concrete when exposed to chloride-induced reinforcement corrosion. Cracks in reinforced concrete specimens were healed using two different calcium sources. After healing, the samples were subjected to 3.5% sodium chloride exposure to salt water for 120 days. The state of corrosion was assessed through standard electrochemical techniques such as half-cell and linear polarization methods as well as ultrasonic-guided waves. After the exposure period, the bars were extracted from concrete, and mass loss and tensile tests were conducted. It was found that electrochemical measurements indicated corrosion activity in the cracked specimens, but the uncracked specimen did not indicate corrosion during the entire exposure period. The presence of electrolytes in the healing fluid seems to have influenced the electrochemical measurements and gave a misleading indication of corrosion. The ultrasonic-guided waves that assess both effects of corrosion, loss of metal and bar-concrete interfacial debonding, were found to realistically assess the state of corrosion in all the samples. The rate of corrosion had slowed down significantly as a result of healing.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
The authors would like to acknowledge the contribution of the Australian Government Research Training Program Scholarship in supporting this research. The authors also acknowledge the use of Curtin University’s Microscopy & Microanalysis Facility, whose instrumentation has been partially funded by the University, State, and Commonwealth Governments. This research is supported by the Australia Research Council Linkage Grant LP180100132 in partnership with industry partners ConBioCrete, Mainroads Western Australia, and Structural Specialities and Projects.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 7 • July 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jan 7, 2022
Accepted: Oct 7, 2022
Published online: Apr 26, 2023
Published in print: Jul 1, 2023
Discussion open until: Sep 26, 2023
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