실태조사를 통한 간만대 콘크리트 교각의 염화물 확산계수 특성
Characteristics of Chloride Diffusion Coefficient in RC Column at Tidal Zone through Field Investigation
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초록
콘크리트는 내구적인 건설재료이지만, 매립된 철근 부식으로 인해 염해는 매우 중요한 열화인자로 고려되고 있다. 본 연구에서는 실태조사를 수행하여, 간만대 및 비말대에 노출되고 3.7∼4.7년 경과된 RC 교각에 대해 4.8∼48.4m 위치의 코어를 13개 채취하여 겉보기 확산계수 및 표면염화물량을 분석하였다. 해수면이 닿는 6.0m까지는 매우 높은 표면염화물량이 도출되었으나 그 이후는 매우 낮은 표면염화물량이 측정되어 9.0m 이상의 부재에서는 내구성에 큰 영향이 없을 것으로 평가되었다. 평가된 겉보기 확산계수는 1.05∼7.24×10-12m2/sec의 범위를 가졌으며 기존의 연구에 비하여 낮은 확산계수를 보이고 있었다. 본 연구에서는 해수면 위치에 따른 표면염화물량 및 겉보기 확산계수의 변화가 정량적으로 분석되었다.
Abstract
Concrete is a durable construction material but chloride attack is considered as a critical deterioration phenomena due to corrosion in embedded steel. This paper presents evaluation of apparent diffusion coefficient and surface chloride content in 13 concrete cores with 4.8∼48.4m height location from RC (Reinforced Concrete) column exposed to tidal and atmospheric zone through field investigation. Concrete cores under high water level of 6.0m show very high surface chloride content but they show very reduced values over high water level, so that chloride effect on corrosion is expected to be insignificant over 9.0m. The measured diffusion coefficient has a range of 1.05∼7.24×10-12m2/sec, which is relatively low for previous investigation. The apparent diffusion coefficient and surface chloride contents are quantitatively investigated in the paper.
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