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Title |
Relationship between Half Cell Potential and Corrosion Amount Considering Saturated Cover depth and W/C ratios in Cement Mortar
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Authors |
류화성(Hwa-Sung Ryu) ; 박재성(Jae-Sung Park) ; 권성준(Seung-Jun Kwon) |
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DOI |
https://doi.org/10.11112/jksmi.2017.21.3.019 |
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Keywords |
반전위 ; 부식수준 ; 관계식 ; 피복두께 ; 물-시멘트비 ; 포화 HCP (Half Cell Potential) ; Corrosion level ; Relationship ; Cover depth ; W/C ; Saturation |
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Abstract |
Concrete is a construction material with porous media and corroded steel inside affects negatively to durability and structural safety. This study aims a derivation of quantitative relationship between measured HCP (Half Cell Potential) and corrosion amount considering cover depth and W/C (water to cement) ratio. For the work, cement mortar specimens with 3 different W/C ratios and 4 different cover depths are prepared, HCPs are measured with 3 different corrosion level. HCP measurement significantly increases in the saturated condition and linear relationship is observed between corrosion level and acceleration period. With increasing corrosion level and W/C ratio, and decreasing cover depth, HCP measurement increases. Considering total corrosion level and HCP measurements, relatively low COV(Coefficient of Variation) of 0.67 is evaluated through multi-linear regression analysis, however higher COVs over 0.90 can be obtained considering level of HCP measurement. In the room condition, corrosion level can be evaluated through measured HCP in the given conditions of cover depth, W/C ratio. diameter of steel inside.
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