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http://dx.doi.org/10.11112/jksmi.2017.21.1.117

Corrosion-Resisting Performance Evaluation of Concrete Mixed with Fly-Ash  

Park, Sang-Soon (Dept. of Civil Engineering, Sangmyung University)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.21, no.1, 2017 , pp. 117-125 More about this Journal
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.
Keywords
Fly-Ash; Accelerated corrosion test; Long-term exposure test; Corrosion of rebar; Combined deteriorating action of carbonation;
Citations & Related Records
Times Cited By KSCI : 8  (Citation Analysis)
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