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Title |
Characteristics of OCP of Reinforced Concrete Using Socket-type Electrodes during Periodic Salt Damage Test
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Authors |
이상석(Sang-Seok Lee) ; 권성준(Seung-Jun Kwon) |
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DOI |
https://doi.org/10.11112/jksmi.2021.25.4.28 |
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Keywords |
부식 전위; 부식 모니터링; Agar 센서; 피복두께; 물-시멘트 비; 염화물 농도 OCP(Open Circuit Potential); Corrosion monitoring; Agar sensor; Cover depth; W/C; Chloride concentration |
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Abstract |
It is known that buried rebars inside concrete structures are protected from corrosion due to passive layer. It is very important to delay thetiming of corrosion or evaluate a detection of corrosion initiation for the purpose of cost-beneficiary service life of a structure. In this study, corrosionmonitoring was performed on concrete specimens considering 3 levels of cover depth(60 mm, 45 mm, and 30 mm), W/C(water to cement) ratio(40.0%,50.0%, and 60.0%) and chloride concentration(0.0%, 3.5%, and 7.0%). OCP(Open Circuit Potential) was measured using agar-based socket typesensors. The OCP measurement showed the consistent behavior where the potential was reduced in wet conditions and it was partially recovered indry conditions. In the case of 30 mm of cover depth for most W/C ratio cases, the lowest OCP value was measured and rapid OCP recovery was evaluatedin increasing cover depth from 30 mm to 45 mm, since cover depth was an effective protection against chloride ion ingress. As the chloride concentrationincreased, the effect on the cover depth tended to be more dominant than the that of W/C ratio. After additional monitoring and physical evaluationof chloride concentration after specimen dismantling, the proposed system can be improved with increasing reliability of the corrosion monitoring.
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