| 선형분극법을 이용한 보통프틀랜드시멘트 콘크리트의 임계염화물량 |
| 김홍삼, 정해문, 안태송 |
| 한국도로공사 도로교통기술원 도로연구팀 |
| Determination of Critical Chloride Content of Ordinary Portland Cement Concrete by Linear Polarization Technique |
| Hong-Sam Kim, Hai-Moon Cheong, Tae-Song Ahn |
| Road Research Team, Expressway & Transportation Technology Institute, Korea Expressway Corporation |
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| ABSTRACT |
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The results of evaluating steel corrosion in concrete containing chloride content of various levels indicated that the more chloride content in concrete leads to the lower potential and higher corrosion current density. However, the open circuit potential of steel varied with time and exposure condition, and the corelation between the open circuit potential and corrosion current density was not obvious. In order to determine the critical threshold content of chloride of steel corrosion in concrete, the concept of average corrosion current density was employed. The range of critical chloride content in portland cement concretes was about $1.56{sim}1.77%$($Cl^-$, %, wt of cement content) along with water-cement ratio, and higher water-cement ratio resulted in reduction in critical threshold chloride content. |
| Key words:
Chloride, Critical threshold content, Portland cement, Steel corrosion, Linear polarization |
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