콘크리트의 투수 및 확산에 미치는 균열효과
Crack Effect on Water Permeability and Chloride Diffusion Coefficient in Concrete
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초록
콘크리트 내구성에서 염화물 확산계수와 투수계수는 물질이동에 지배적인 영향을 미치므로 매우 중요하다. 균열이 발생한 콘크리트에서는 염화물 확산계수와 투수성이 크게 증가한다. 본 연구는 균열을가진 콘크리트에서 발생하는 염화물 확산계수와 투수계수의 관계를 도출하는데 목적이 있다. 이를 위해 콘크리트 실린더 시편에 다양한 균열을 도입한 후, 촉진염화물 확산계수(정상 및 비정상)와 투수계수를 실험적으로 평가하였다. 균열폭이 0.4mm로 증가하면서 촉진염화물 확산계수는 비선형적으로 증가하였으며, 투수계수는 최대 400배 이상의 증가하였다. 균열에 따른 촉진확산계수 증가분과 투수계수의 증가분간의 관계가 도출되었다. 정상 및 비정상 촉진 확산계수간의 관계는 선형적으로 나타났으나,투수계수와의 관계는 비선형적인 지수함수형태로 평가되었다.
Abstract
Chloride Diffusion Coefficient (CDC) and Water Permeability (WP) are very important since theygovern mass transportation in concrete. When crack occurs, they increase significantly. This studyis for obtaining a relationship between CDC and WP in cracked concrete. For this work, variouscrack widths are induced in concrete specimens and CDCs (steady and non steady state) and WPsare experimentally evaluated. With increasing of crack width to 0.4mm, CDC increases non-linearlyand WP increases to 400 times for sound concrete. An increasing ratios of CDC and WP due tocrack width are evaluated. Linear relationship between CDCs and non-linear relationship betweenCDC and WP is obtained with exponential form.
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