Chloride Transport in Interfacial Zone of New–Old Concrete Joints of Precast Prestressed Concrete Bridges under Fatigue Load
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 10
Abstract
The interfacial zone of new–old concrete in precast concrete structure is the natural weak part in durability, and fatigue stress and an aggressive medium will accelerate the durability degradation of the interfacial zone. To study the chloride transport behavior in the interfacial zone of new–old concrete joints of precast prestressed bridges under the combined action of fatigue load and chloride penetration, a set of long-term (90–360 days) and low-frequency (0.3 Hz) experiments was carried out in this paper, where three fatigue stress ranges and four exposure durations were set as the main variables. The results indicated that the chloride content in the interfacial zone is higher than that present elsewhere, which shows the interfacial zone effect (IZE). By introducing the index of IZE, the influence laws of fatigue stress range and exposure duration on the IZE are revealed, namely as the fatigue stress range increases, the IZE first increases and then decreases, and as the exposure duration increases, the IZE decreases invariably. Moreover, the influence mechanism of fatigue stress range and exposure duration on the distribution and evolution of chloride concentration in the interfacial zone is analyzed. Considering the heterogeneous distribution of mesocomposition and internal defects (pores) in the interfacial zone of new–old concrete, the model of the chloride diffusion coefficient is established. Based on the relationship between volume strain and porosity, and the relationship between strain and specific crack area, a revised model of the effective chloride diffusion coefficient in the interfacial zone under fatigue stress is proposed. The accuracy of the revised model was verified by physical experiments.
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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
Financial support from the National Natural Science Foundation of China (NSFC) with Grant No. 51878656 and the Key Project of Research and Development Program of Jiangsu Province, China, with Grant No. BE2018636 are gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 10 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 31, 2021
Accepted: Jan 31, 2022
Published online: Jul 22, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 22, 2022
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