Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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A Study on Accelerated Corrosion Test by Combined Deteriorating Action of Salt Damage and Freeze-Thaw

염해 및 동결융해의 복합열화 작용에 의한 부식촉진시험에 관한 연구

  • Park, Sang-Soon (Department of Civil Engineering, Sangmyung University) ;
  • So, Byung-Tak (Department of Civil Engineering, Sangmyung University)
  • 박상순 (상명대학교 건설시스템공학과) ;
  • 소병탁 (상명대학교 건설시스템공학과)
  • Received : 2016.01.09
  • Accepted : 2016.02.22
  • Published : 2016.02.28
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Abstract

In this study, the accelerated corrosion test by combined deteriorating action of salt damage and freeze-thaw was investigated. freeze-thaw cycle is one method for corrosion testing; corrosion initiation time was measured in four types of concrete samples, i.e., two samples mixed with fly ash (FA) and blast furnace slag (BS), and the other two samples having two water/cement ratio (W/C = 0.6, 0.35) without admixture (OPC60 and OPC35). The corrosion of rebar embedded in concrete occurred most quickly at the $30^{th}$ freeze-thaw cycle. Moreover, a corrosion monitoring method with a half-cell potential measurement and relative dynamic elastic modulus derived from resonant frequency measures was conducted simultaneously. The results indicated that the corrosion of rebar occurred when the relative dynamic elastic modulus was less than 60%. Therefore, dynamic elastic modulus can be used to detect corrosion of steel bar. The results of the accelerated corrosion test exhibited significant difference according to corrosion periods combined with each test condition. Consequently, the OPC60 showed the lowest corrosion resistance among the samples.

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References

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