몰타르 시험편(W/C:0.4) 내부철근의 분극특성에 미치는 재령년수의 영향

문경만; 이성열; 박동현; 정진아; 이명훈; 백태실

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자료유형: 학술저널

저자정보: 문경만 이성열 박동현 정진아 이명훈 백태실

저널정보: 한국부식방식학회 Corrosion Science and Technology Corrosion Science and Technology 제13권 제1호

발행연도: 2014.1

수록면: 20 - 27 (8page)

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The structures of reinforced concrete has been extensively increased with rapid development of industrialsociety. Futhermore, these reinforced concretes are easy to expose to severe corrosive environments suchas sea water, contaminated water, acid rain and seashore etc.. Thus, corrosion problem of inner steel barembedded in concrete is very important in terms of safety and economical point of view. In this study,multiple mortar test specimen(W/C:0.4) with six types having different cover thickness each other was preparedand was immerged in seawater solution for five years to evaluate the effect of cover thickness and immersionyears to corrosion property of embedded steel bar. And the polarization characteristics of these embeddedsteel bars was investigated using electrochemical methods such as measuring corrosion potential, cathodicpolarization curve, and cyclic voltammogram. At the beginning of immersion, the corrosion potentials exhibitedincreasingly nobler values with increasing cover thickness. However, after immersed for 5 years, the thickercover of thickness, the corrosion potentials shifted in the negative direction, and the relationship betweencorrosion potential and cover thickness was not in good agreement with each other. Therefore, it is consideredthat the thinner cover of thickness, corrosive products deposited on the surface of the embedded steel barplays the role as a resistance polarization which is resulted in decreasing the corrosion rate as well asshifting the corrosion potential in the positive direction. As a result, it seemed that the evaluation whichcorrosion possibility of the reinforced steel would be estimated by only measuring the corrosion potentialmay not be a completely desirable method. Therefore, it is suggested that we should take into accountvarious parameters, including cover thickness, passed aged years as well as corrosion potential for moreaccurate assessment of corrosion possibility of reinforced steel which is exposed to partially or fully inmarine environment for long years.

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

참고문헌 (16)

참고문헌 신청

/ 1980 / ASTM C876-80, Half Cell Potentials of Reinforcing Steel in Concrete : 87 ~

Concrete Society of Japan / 1984 / Protection Guide of Marine Concrete Structure : 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 Japan 32 : 73 ~