earticle

영어

It is generally accepted that concrete durability is governed by the resistance of concrete to the penetration of aggressive media. This paper discusses the relationship between air permeability of concrete and corrosion rate of reinforcing steel in concrete by penetration of chloride ion. The 24 types of concrete were made by several parameters such as water-binder ratio, the type and replacement ratio of admixture materials, use of air-entrained agent, and the pore structure and air permeability, penetration depth of chloride ion, corrosion rate of reinforcing steel by the penetration of chloride ion were measured. As a results, the resistance of concrete to the penetration of aggressive media is classified by air permeability based on the pore structure. It is shown that air permeability of concrete is more related to the capillary porosity(pore volume of 50∼7500nm) than the total porosity in concrete. There is a good relationship between air permeability of concrete and corrosion rate of reinforcing steel by the penetration of chloride ion. Thus, air permeability may be used as the technical data for estimating the remaining service life in the reinforcement corrosion to the penetration of aggressive media such as chloride ion.

한국어

본 연구에서는 외부 유해물질의 침투에 대한 콘크리트 자체의 저항성, 즉 콘크리트의 물질 이동특성을 투기성에 의해 평가하고 그 결과를 콘크리트의 세공구조 특성과 함께 분석하였으며, 각 투기계수와 6개월 침지실험(10% NaCl 용액)에 의한 염소이온 침투 깊이 및 염소이온 침투로 인해 야기된 철근의 부식율의 관계를 직접 비교·분석함으로써 염해로 인한 철근의 부식에 미치는 콘크리트 투기성의 영향을 종합적으로 평가하고자 하였다.