Equivalent conversion investigation of environmental corrosion of suspenders in long-span suspension bridge
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 9 October 2023
Issue publication date: 20 November 2023
Abstract
Purpose
This paper aims to investigate the equivalent relationship between accelerated corrosion tests and real environmental spectrum of suspenders in long-span suspension bridge considering multiple factors action.
Design/methodology/approach
Based on Faraday's law, corrosion current was used as a measure of metal corrosion, and the equivalent conversion relationship between laboratory environment and real service environment was established. The equivalent conversion method for bridge structural steel had been determined under different temperature, humidity, pH value and NaCl concentration conditions. The compilation of environmental spectra for large span bridges considering multiple factors and the principle of equivalent conversion have been proposed.
Findings
Environmental factors, including temperature, humidity, pH value and NaCl concentration, have significant impact on the corrosion degree of suspension steel wires, and only considering these two factors for equivalent conversion cannot accurately reflect the true service environment of the bridge. The 33.8-h salt spray accelerated corrosion test using the standard conditions can be equivalent to one year of suspenders corrosion in a real service environment.
Originality/value
The equivalent accelerated corrosion method for steel wires proposed in this study can effectively predict the corrosion degree of the suspenders, which has been verified to be correct and can provide theoretical guidance for the development of corrosion test plans for steel wires and engineering technical basis for anti-corrosion control and calendar life research of suspension bridge suspenders.
Keywords
Acknowledgements
This study is financially supported by the National Natural Science Foundation of China (CN) (No. 51978155, 52108274 and 52338011) and the Postgraduate Research and Practice Innovation Program of Jiangsu Province (No. SJCX23_0067).
Declaration of competing interest: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Citation
Yuan, Z., Wang, H., Li, R., Mao, J. and Gao, H. (2023), "Equivalent conversion investigation of environmental corrosion of suspenders in long-span suspension bridge", Anti-Corrosion Methods and Materials, Vol. 70 No. 6, pp. 533-541. https://doi.org/10.1108/ACMM-08-2023-2883
Publisher
:Emerald Publishing Limited
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