Corrosion rate measurements in steel sheet pile walls in a marine environment |
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| Institution: | 1. Key Laboratory of Oil & Gas Storage and Transportation, College of Petroleum Engineering, Liaoning Shihua University, Fushun, Liaoning 113001, China;2. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, Shandong 266555, China;1. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China;2. Zhengzhou Key Laboratory of Disaster Prevention and Control for Cable Structure, Zhengzhou 450001, China;3. Henan College of Transportation, Zhengzhou 451400, China;4. School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China;1. Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;4. Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China;1. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education of the PR China, Guangxi University, Nanning, 530004, China;2. School of Civil Engineering & Architecture, Guangxi University, Nanning, 530004, China;3. Agency of Housing and Urban-Rural Development, Guangxi Autonomous Zhuang Region, Nanning 530028, China;4. Natural Hazard Research Centre (NHRC), Nanyang Technological University, Singapore 639798, Singapore |
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| Abstract: | Corrosion of steel structures in the marine environment is a major problem. The deterioration of this kind of structures is costly and difficult to predict both when designing new structures and when estimating the remaining service life time for existing structures. The aim of this investigation was to find indicative values for the corrosion rate of steel sheet piles on the Swedish west coast. Such corrosion rates (mm/year) can be used both when designing new structures by oversizing the steel thickness and when estimating the bearing capacity of existing sheet pile structures. Earlier investigations on the corrosion rates along the Swedish east coast – with salinity from about 0.2% to 0.8% – are still used today as guidelines for the corrosion rate of all steel structures in the Swedish maritime environment even though the salinity on the west coast can be as high as 3.0%.Steel sheet pile wharfs located in the port of Halmstad on the Swedish west coast were inspected by ultrasonic measurements. Three wharf structures with a total length of about 700 m were inspected. None of the inspected wharfs had or have had cathodic protection. The thickness measurements of the steel sheet pile structures were performed by divers.The age of the three inspected sheet pile structures ranged from 36 to 51 years. The dimensions of the original sheet pile sections are known. One of the quay structures is located along a river. The salinity at all wharfs varied from low values at the surface to approx. 2% at the bottom (also in the river outflow).The measured average corrosion rates were in the same order as the design values in the European code. However, the results indicate increased corrosion rates about 1 m below the mean water surface and at the level of the propellers from the ships berthing the most frequented of the inspected wharfs, 3–6 m below water surface.The tolerances of steel sheet thicknesses – usually in the order of ±6% – are often neglected when investigating the remaining thickness in steel sheet piles. A simple calculation model shows that the sheet pile must be almost 50 years of age before an accurate estimation on the corrosion rate can be made, considering the tolerances, if the true original sheet pile thickness is not known. |
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| Keywords: | Corrosion rate Sheet pile Marine corrosion |
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