CORROSION PROTECTION SYSTEM FOR REINFORCING STEEL IN RC BRIDGES EXPOSED TO CHLORIDE ENVIRONMENT

摘要

Recent long-span bridges, such as Kwang-Ahn Grand bridge, Seo-Hae Grand Bridge, Young-Jong Grand Bridge, etc, in Korea, have been designed and constructed near the shore. Thus, it needs to analyze the durability of marine concrete structures which are exposed to severe chloride environments. It is well known that corrosion of reinforcement steel in concrete is one of the major factors for the durability of concrete structures. The objective of this experimental study is to investigate the performance of impressed current system, corrosion inhibitors and zinc spray method for the corrosion protection of reinforced concrete structures. Concrete test specimens were made with various test parameters, such as cover depth, steel diameter, compressive strength, width and frequency of cracks. For the efficient evaluation of these corrosion protection systems, these tests have been carried out separately in the laboratory and in the shore.