Study on the interference effect of electric hybrid cathodic protection system on steel and concrete piles
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Port structures are mostly constructed from reinforced concrete that can withstand high compressive forces in preparation for collisions or wave shocks caused by ships. The rebar within the concrete is shielded from corrosion by the formation of a passive layer in a highly alkaline environment. However, over time, this rebar becomes susceptible to corrosion, especially when exposed to corrosive conditions such as seawater. To combat this corrosion, cathodic protection has been developed and widely employed to safeguard rebar in reinforced concrete structures. This cathodic protection can be categorized into two main types: Sacrificial Anode Cathodic Protection (SACP) and Impressed Current Cathodic Protection (ICCP). In recent construction projects, there has been a focus on expanding existing ports, often resulting in the juxtaposition of steel and reinforced concrete piles supporting the upper structure. If the pier consists of a long connection between a reinforced concrete port and steel port, or if the harbor structure and marine bridge are adjacent, problems caused by leakage current generated between the cathodic protection facilities will inevitably occur. However, there are many cases where the entity that manages the structure is different. To prevent safety accidents and clarify responsibility for accidents, it is necessary to consider the problem of stray current. To effectively prevent stray current when connecting SACP and ICCP systems, it is advisable to set the ICCP system’s protective potential to approximately 10 to 20 mV higher than that of the SACP system.
Abstract
Port structures are mostly constructed from reinforced concrete that can withstand high compressive forces in preparation for collisions or wave shocks caused by ships. The rebar within the concrete is shielded from corrosion by the formation of a passive layer in a highly alkaline environment. However, over time, this rebar becomes susceptible to corrosion, especially when exposed to corrosive conditions such as seawater. To combat this corrosion, cathodic protection has been developed and widely employed to safeguard rebar in reinforced concrete structures. This cathodic protection can be categorized into two main types: Sacrificial Anode Cathodic Protection (SACP) and Impressed Current Cathodic Protection (ICCP). In recent construction projects, there has been a focus on expanding existing ports, often resulting in the juxtaposition of steel and reinforced concrete piles supporting the upper structure. If the pier consists of a long connection between a reinforced concrete port and steel port, or if the harbor structure and marine bridge are adjacent, problems caused by leakage current generated between the cathodic protection facilities will inevitably occur. However, there are many cases where the entity that manages the structure is different. To prevent safety accidents and clarify responsibility for accidents, it is necessary to consider the problem of stray current. To effectively prevent stray current when connecting SACP and ICCP systems, it is advisable to set the ICCP system’s protective potential to approximately 10 to 20 mV higher than that of the SACP system.
참고문헌 (12)
- S. W. Tang, "Recent du-rability studies on concrete structure", Cement and Concrete Research, 78, pp.143~154 (2015)
- M. Alexander, "Durability, service life prediction, and modelling for reinforced concrete struc-tures–review and critique", Cement and Concrete Research, 122, pp.17~29 (2019)
- H. V. Damme, "Concrete material science: Past, present, and future innovations", Cement and Concrete Research, 112, pp.5~24 (2018)
- A. Poursaee, "Corrosion of Steel in Con-crete Structures", pp.17~34 (2023), Woodhead Publishing
- M. U. Khan, "Chloride-induced corrosion of steel in concrete : An overview on chlo-ride diffusion and prediction of corrosion initiation time", Hindawi International Journal of Corrosion, 2017, pp.1~9 (2017)
- K. Hájková, "Pre-diction of reinforcement corrosion due to chloride ingress and its effects on serviceability", Engineering Structures, 174, pp.768~777 (2018)
- K. Takewaka, "Cathodic protection for reinforced-concrete and prestressed-concrete structures", Corrosion Science, 35(5-8), pp.1617~1623 (1993)
- A. Byrne, "State-of-the-art re-view of cathodic protection for reinforced concrete struc-tures", Magazine of Concrete Research, 68, pp.664~677 (2016)
- Z. Chen, "A review on stray current-induced steel corrosion in infrastructure", Corrosion Reviews, 35(6), pp.397~423 (2017)
- A. O. S. Solgaard, "Experimental observations of stray current ef-fects on steel fibres embedded in mortar", Corrosion Sci-ence, 74, pp.1~12 (2013)
- K. Hornbostel, "Relation-ship between concrete resistivity and corrosion rate-A lit-erature review", Cement and Concrete Composites, 39, pp.60~72 (2013)
- National Association of Corrosion Engineers, "Control of external corrosion on underground or submerged metallic piping systems", United States of America, ~ (2013)