Multi-Ion Erosion Experiment and Corrosion Mechanism Verification of Steel Fiber–Reinforced Concrete under Stray Current
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 12
Abstract
The durability of concrete structures that have been in service for a long time under the coupled action of stray current and salt-brine environment has become increasingly important. Because of the excellent mechanical properties of steel fiber–reinforced concrete (SFRC), erosion experiments of SFRC were carried out to study issues such as the erosion depth, strength loss, ion migration, and microscopic morphology changes of SFRC under the action of stray current in a salt-brine environment. The color test and compressive strength were used to characterize the penetration depth of chloride ions and the strength loss of concrete, respectively. The titration method was used to detect the chloride and sulfate ion content. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were used to characterize the microscopic morphology and composition; the finite-element method and discrete-element method were used to explain further and verify the mechanism of SFRC corrosion. This research showed under the action of an electric field, chloride ions transport faster than sulfate ions. The strength loss of SFRC is caused mainly by the erosion and expansion of steel fibers. Products such as gypsum and ettringite are generated only in the cathode area, which also reduces the strength of SFRC to a certain extent.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was financially supported by the Fundamental Research Funds for the Central Universities (B210203008), the National Natural Science Foundation of China (Nos. 51679074 and 52079049), and the Youth Innovation Team of Shaanxi Universities.
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 12 • December 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Dec 14, 2021
Accepted: Mar 29, 2022
Published online: Oct 11, 2022
Published in print: Dec 1, 2022
Discussion open until: Mar 11, 2023
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