Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Influence of Binder Type on the Chloride Threshold Level for Steel Corrosion in Concrete

  • Moon Han-Young (Dept. of Civil Engineering, Hanyang University) ;
  • Ann Ki-Yong (Dept. of Civil and Environmental Engineering, Imperial College) ;
  • Jung Ho-Seop (Dept. of Civil Engineering, Daejin University) ;
  • Shin Dong-Gu (Dept. of Civil Engineering, Hanyang University)
  • Published : 2005.08.01
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Abstract

The present study concerns the influence of binder type on the chloride-induced corrosion being accompanied by the chloride threshold level (CTL), chloride transport and as their results the corrosion-free lift. Two levels of cement content, $30\%$ PFA and $65\%$ GGBS concrete were employed. It was found that the most dominant factor to the CTL is the entrapped air void content at the steel-concrete interface, irrespective of the chloride binding capacity, binder type and acid neutralisation capacity of cement matrix. The CTL for lower interfacial air void contents was significantly increased up to $1.52\%$ by weight of cement, whereas a same mix produced $0.35\%$ for a higher level of voids. Because of a remarkable reduction in the diffusion fur GGBS concrete, its time to corrosion ranges from 255 to 1,250 days, while the corrosion-free life for control varies from 20 to 199 days sand for $30\%$ PFA concrete from 200 to 331 days.

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References

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