Tensile Behavior of Corroded Steel Bars at Elevated Temperatures
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 4
Abstract
Corroded steel bars frequently exist in concrete structures under chloride exposure conditions. Tensile behaviors of corroded steel bars at high temperatures are important in the fire-resistance evaluation of corroded reinforced concrete structures. This paper presents an experimental investigation on the tensile behavior of corroded steel bars at elevated temperatures. Corroded steel bars with different corrosion degrees are obtained by using the impressed current method. Then, a three-dimensional (3D) laser-scanning technique is applied to geometrically modeled corroded steel bars to quantify the corrosion degree. To investigate the influence of corrosion degree and temperature on the mechanical properties of steel bars, steady-state tensile tests were conducted at elevated temperatures. According to test results, the fracture initiation of an uncorroded steel bar occurs at the center of the fracture surface, whereas for a corroded steel bar, it moves to a corrosion pit on the surface. The effective elastic stiffness decreases significantly with the increase of temperature, whereas the influence of corrosion on the elastic stiffness could be ignored. The yield and ultimate strength in terms of the average cross-sectional area decrease with the increase of both the temperature and corrosion degree, and corrosion shows a decreased impact at a higher temperature. For a steel bar with a corrosion degree of 0.15, the yield and ultimate strength reduce by 11% and 17% at room temperature and by 9% and 10% at 500°C, respectively. However, the influence of corrosion on the yield and ultimate strength in terms of minimum cross-sectional area can be neglected. The yield plateau shortens with the increasing temperature and disappears at the critical temperature, which is around 300°C for uncorroded steel bars, and decreases linearly with the increase of corrosion degree. As temperature increases, the ultimate strain firstly decreases to the lowest value at about 400°C, and then increases, and it further decreases with the development of corrosion at a certain temperature.
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Data Availability Statement
Longitudinal distribution of cross-sectional areas of corroded steel bars, and the data used to plot load-deformation relationships shown in Figs. 10 and 11 are available from the corresponding author upon reasonable request.
Acknowledgments
This work was financially supported by the National Key Basic Research and Development Program of China (973 Program) (2015CB655103) and the National Natural Science Foundation of China (51179081).
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 4 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Feb 11, 2020
Accepted: Aug 31, 2020
Published online: Jan 23, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 23, 2021
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