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Journal of the Korean Society of Hazard Mitigation 2004;4(3):73-82.
Published online September 30, 2004.
내구성 해양 RC 구조물의 철근 피복적정성에 관한 연구
임정순, 방윤석, 조재병
A Study on the Cover Property of Offshore Reinforced Concrete Structure
Jung-Soon Im, Yun-Suk Bahng, Jae-Byung Jo
Abstract
On this study, durability decreasing element caused by salt damage was analyzed elementally and studied with the data of the inside and outside in the country. The design strength and water-cement ratio according to diffusion coefficients of chloride were applied to Fick`s diffusion equation. The required over depended on environmental conditions is estimated with endurance period, and the influences on cover according to the transformation of the each parameter were investigated. In consequence, if water-cement ratio decreases and design strength increases, it shows that slowing infiltration velocity of chloride ion can decrease required cover. Especially, it is more effective to use Portland blast-furnace slag cement into high strength concrete in the splash zone environmental conditions in blocking the diffusion of chloride ion. As the result, in the case of the offshore concrete structure needed high durability, it is needed to increase cover($3cm{sim}8cm$) than minimum standard cover(8cm) according to environmental conditions.
Key Words: cover; salt damage; service life; diffusion coefficients; splash zone
요지
본 연구에서는 염해에 대한 내구성 저하 요인을 국내외 자료에 의해 요인별 분석, 고찰하고 Fick의 확산 방정식을 적용하여 설계기준강도와 물-시멘트비에 따른 염화물의 확산계수와 내구년한에 의한 환경조건별 소요피복두께를 산출하여 각 변수들의 변화에 따른 영향을 고찰하였다. 물-시멘트비가 감소하고 설계강도가 증가되면 염화이온의 침투속도가 낮아져 소요피복두께를 줄이는 것으로 나타났다. 특히 비말대 환경조건에서 고강도 콘크리트에 고로슬래그 시멘트를 사용할 경우 염화이온의 확산을 막는데 더욱 효과적이였다. 결과적으로 고내구성을 필요로 하는 해양콘크리트 구조물의 경우 최소피복두께 기준인 8cm보다 환경조건에 따라 $3{sim}8cm$의 피복두께가 증가되어야 1등급 내구년한을 만족시키는 것으로 나타났다.
핵심용어: 설계피복두께; 염해; 내구수명; 확산계수; 비말대


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