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Title |
Corrosion-Resisting Performance Evaluation of Concrete Mixed with Fly-Ash
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DOI |
https://doi.org/10.11112/jksmi.2017.21.1.117 |
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Keywords |
플라이애시 ; 촉진부식시험 ; 장기폭로시험 ; 철근부식 ; 탄산화 복합열화 Fly-Ash ; Accelerated corrosion test ; Long-term exposure test ; Corrosion of rebar ; Combined deteriorating action of carbonation |
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Abstract |
The role of fly ash in concrete become impotent with finding the characteristics of fly ash in which it is used as cement replacement material. In this paper, corrosion test results obtained by two test methods such as the long-term exposure corrosion test and the accelerated corrosion test method, were compared to investigated the corrosion resistance between fly ash concrete and normal concrete. Corrosion initiation time was measured in two types of concrete, i.e., one mixed with fly ash(FA) and the other without admixture(OPC). The accelerated corrosion test was carried out by four case, i.e., two samples is a cyclic drying-wetting method combined without carbonation(case 1) and combined with carbonation(case 2), and the other two samples is a artificial seawater ponding test method combined without carbonation(case 3) and combined with carbonation(case 4). Whether corrosion occurs, it was measures using half-cell potential method. The ponding test combined without carbonation was most effective in accelerating corrosion time of steel bars. The results indicated that the corrosion of rebar embedded in concrete occurred according to the order of OPC, FA. The delay relative ratio of corrosion obtained by corrosion initiation time between FA and OPC is 1.04 to 1.27. Consequently, fly ash concrete as the age increases its corrosion resistance was improved compared with OPC concrete.
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