염해환경하의 철도 콘크리트 구조물에 대한 내구성 설계

Durability design as well as service life prediction of RC structures is critical for sustainable development of railroad concrete structures in marine environment. In order to predict the service life of reinforced concrete structures subjected to chloride attack, it is necessary to develop an analytical approach to predict the time and space dependent analysis on chloride penetration of concrete structures up to the durability limit state, which is defined conservatively as a time for the corrosion initiation, i.e., the time to reach the critical chloride threshold value at the surface of the rebar in reinforced concrete structures. In this paper, a performance-based durability design method is introduced for marine concrete structures subjected to chloride attack. By using the design method, a service life design is carried out for reinforced concrete bridges exposed to marine environment. Then, a deterioration analysis due to chloride attack for service life prediction of reinforced concrete structures is also carried out. Finally, current durability design method for marine concrete structures specified in current railroad design code is analyzed. The analysis shows that correct parameters like surface chloride concentration for the seashore in Korea and chloride threshold level are necessary for accurate durability design.