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염해 환경에 있는 지하철 콘크리트 구조물의 내구성 향상 대책수립에 관한 연구
이무관(Lee Moo-Kwan),김은겸(Kim Eun Kyun),김대호(Kim Dae Ho) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
Durability of concrete has been currently issued in the engineering societies and a large number of studies on the concrete corrosion in salty environment have been performed. The reinforcement corrosion, which is the primary reason of deterioration of the concrete structure exposed to chloride environment, is caused by the chloride ions infiltration owing to underground water seeping into the concrete. In this study. the endurance periods using the diffusion equation of the concrete specification have been evaluated on the concrete structures with different addictives for the brand new R/C subway structure exposed to seashore underground water. Furthermore, the guidance for proper use of the addictives and the reasonable thickness of concrete cover are derived for concrete mixing. From the result of the evaluation corresponding to salt damage for Inchon subway line 1, the endurance periods of the ordinary Portlaudcement concretes are represented as 42~75 years and fail to achieve the objective period of 100 years. However, the lower water-cement ratio expands the endurance period and the blast furnace slag concrete with small quantity of the silica fume, which shows the best performance of corrosion resistance in this study, represents more than 170 years of the endurance period. Moreover, the case of use of blast furnace slag and fly ash together shows the endurance period of 134~171years and it means that the result very satisfies the objective endurance period.
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