모르타르(W/C:0.5)내의 철근의 부식 특성에 미치는 재령 년수와 피복두께의 영향

문경만; 이성열; 정진아; 이명훈; 백태실

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자료유형: 학술저널

저자정보: 문경만 이성열 정진아 이명훈 백태실

저널정보: 한국부식방식학회 Corrosion Science and Technology Corrosion Science and Technology 제14권 제2호

발행연도: 2015.1

수록면: 99 - 105 (7page)

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연구주제

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연구배경

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연구결과

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The structures of reinforced concrete have been extensively increased with rapid development of industrial society. Futhermore, these reinforced concretes are easy to expose to severe corrosive environments such as seawater, contaminated water, acid rain and seashore etc.. Thus, corrosion problem of steel bar embedded in concrete is very important in terms of safety and economical point of view. In this study, specimens having six different coating thickness (W/C:0.5) were prepared and immersed in flowing seawater for five years to evaluate the effect of coating thickness and immersion time on corrosion property. The polarization characteristics of these embedded steel bars were investigated using electrochemical methods such as corrosion potential, anodic polarization curve, and impedance. At the 20-day immersion, the corrosion potentials exhibited increasingly nobler values with coating thickness. However, after 5-yr. immersion their values were shifted in the negative direction, and the relationship between corrosion potential and coating thickness was not shown. Although 5-yr. immersion lowered corrosion potential, 5-yr. immersion did not increase corrosion rate. In addition, after 5-yr. immersion, the thinner cover thickness, corrosion current density was decreased with thinning coating thickness. It is due to the fact that ease incorporation of water, dissolved oxygen and chloride ion into a steel surface caused corrosion and hence, leaded to the formation of corrosion product. The corrosion product plays the role as a corrosion barrier and increases polarization resistance. The corrosion probability evaluated depending on corrosion potential may not be a good method for predicting corrosion probability. Hence, the parameters including cover thickness and passed aged years as well as corrosion potential is suggested to be considered for better assessment of corrosion probability of reinforced steel exposed to partially or fully in marine environment for long years.

#reinforced concrete #corrosion potential #anodic polarization #impedance #cover thickness #W/C

참고문헌 (16)

참고문헌 신청

/ 1999 / ASTM C876-80, Standard Test Method for Half-Cell Potentials of Uncoated Reinforcing Steel in Concrete (Withdrawn 2008) / ASTM International

Concrete Society of Japan / 1984 / Protection Guide of Marine Concrete Structure(proposal) / Juridical Foundation : 10 ~

D. H. Jeon / 1992 / / Corros. Sci. Tech 21 : 11 ~

D. H. Jeon / 1992 / / Corros. Sci. Tech 21 : 3 ~

G. C. Jang / 1994 / / J. Conc. Soc. of Jpn 32 : 73 ~

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