Paper
On Site Monitoring of Corrosion of Marine Structure Using Self Sacrificial Galvanic Anodes – Case Study
- Authors:
- V. Rajendran; R. Murugesan
- Abstract
- In recent years, focus has been shifting towards repair and rehabilitation of deficient concrete infrastructures rather than replacement, either in full or replacing the structural members. While carrying out the rehabilitation, one should keep in mind that the methodology should have cost effective strategy and durability. The deterioration caused by the corrosion of reinforcing steel in concrete structures has been recognized as one of the greatest maintenance challenges being faced by many government agencies and other private owners including the engineering contracting companies in the field of construction industry today. Technological advances have created a wide range of new product and systems, which claim to provide long-lasting protection and serviceability for these structures. Usage of different types of surface coating on rebars for the corrosion protection is no longer a proven system on account of many reasons like, reduction in bond stress between the concrete & rebar and so on. Also in the eventuality of rehabilitation of structural elements after a few years, the entire process including chipping the cover concrete, exposing the rebar, cleaning rebars, applying corrosion protection coating to the rebar, providing formwork, pumping of micro concrete, etc., becomes cumbersome and uneconomical in addition to a lot of disturbance to the occupants. However, in order to effectively address the problem it is essential to first understand the cause of the corrosion. The paper describes in detail the philosophy of the corrosion and evaluates the effect of having anodes installed in the concrete members. The paper also describes in detail investigations conducted on a corrosion damaged marine structure at main land and also at an Island, and the repair methodology suggested for the rehabilitation of the structure and executed. The repair methodology proposed included the provision of galvanic anodes. The data presented on the monitoring of the repaired marine structures through half cell potential test conducted over a period of one year from the time of completion of the repair to assess the effectiveness of the sacrificial anodes. The investigations have clearly demonstrated that galvanic anodes have proved to be an effective corrosion control technique for reinforced concrete structures.
- Keywords
- Corrosion; Galvanic Anodes; Concrete; Half Cell Potential; Rehabilitation; Marine; Methodology; Reinforcement; Cos; Micro Moncrete; Shear Connector
- StartPage
- 193
- EndPage
- 201
- Doi