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Vol.41, No.4, 236 ~ 244, 2003
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| Title |
| Effect of Fly Ash on the Steel Corrosion in Concrete Structures |
| 박진택 Zin Taek Park , 유지홍 Ji Hong Yoo , 김정구 Jung Gu Kim , 이재호 Jae Ho Lee , 이광명 Kwang Myong Lee |
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| Abstract |
| Addition of fly ash has beneficial effects on some mechanical properties of concrete, as well as the corrosion process induced by the chloride ion. The aim of this study was to investigate the effect of fly ash on the steel corrosion in concrete with various water-to-binder ratios. The corrosion process of steel bars embedded in concrete without fly ash and with 20% fly ash was tested under complete immersion, in 3.5 wt.% NaCl solution. Monitoring of open-circuit potential and linear polarization method and electrochemical impedance spectroscopy(EIS) were used to follow the corrosion process. Also, ASTM C1202 test method was used to estimate the concrete`s resistivity of chloride penetration in concrete. The results obtained from electrochemical tests show that the use of fly ash has led to the improvement of corrosion resistance. Partial cement replacement by fly ash caused significant pore refinement, reduced permeability to chloride ions, and increased corrosion resistance. |
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| Key Words |
| Corrosion, Concrete, Fly ash, Immersion test, EIS |
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