Experimental Study on Deterioration Characteristics of Prestressed Concrete under the Coupling of Freeze–Thaw and Corrosion
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 2
Abstract
In order to explore the deterioration characteristics of prestressed concrete under the coupling of freeze–thaw and corrosion, a series of aging tests and three-point bending tests was conducted. Furthermore, the deterioration process was analyzed at the meso-level with the help of computed tomography (CT) technology. The following conclusions can be drawn: (1) within a certain range, under the coupling effect, freeze–thaw and corrosion promote each other, and the degradation effect of the coupling test of freeze–thaw and corrosion is greater than the simple superposition of the two; (2) after the aging test, when the number of freeze–thaw cycles or the corrosion rate are higher, the cracking load and the ultimate load of the prestressed concrete are reduced, but the loss rate of the ultimate load is small; (3) the effective prestress of the aging specimen can be obtained according to the cracking moment, and the calculation formula is simplified according to the mechanical characteristics; and (4) under the coupling of freeze–thaw and corrosion, the size of the cracks and the number of the pores inside the specimen increase, whereas the number of pores in the volume range of does not change significantly due to the filling effect of corrosion products.
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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 research was supported by the National Key Research and Development Plan of China (2018YFC0406901) and the National Natural Science Foundation of China (Grant No. 52079092).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 2 • February 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Oct 21, 2020
Accepted: Jun 17, 2021
Published online: Nov 25, 2021
Published in print: Feb 1, 2022
Discussion open until: Apr 25, 2022
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