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Title |
Study on the Critical Threshold Chloride Content for Steel Corrosion in Concrete with Various Cement Contents
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Authors |
양승규 ; 김동석 ; 엄태선 ; 이종열 ; 河野克哉 |
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Keywords |
철근부식 ; 임계 염화물량 ; 염소이온 ; EPMA steel corrosion ; critical threshold chloride content ; chloride ion ; Electron Probe Micro Analyzer |
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Abstract |
Reinforced concrete starts to corrode when the chloride ion concentration which is the sum of included in concrete and penetrated from environments exceeds a certain level of critical chloride concentration. Therefore each country regulates the upper bounds of chloride amount in concrete and the regulations are different for each country due to its circumstances. In this study, the critical threshold chloride content according to unit cement amount is empirically calculated to propose a reasonable regulation method on the chloride amount. As a result, the critical threshold chloride content increases considerably according to cement content and it agrees with the established theories. The present regulations on total chloride amount 0.3 or 0.6 kg chloride ions per 1 m3 of concrete does not reflect the influences of mix design, environmental conditions and etc. So it can be said that it is more reasonable to regulate the critical threshold chloride content by the ratio of chloride amount per unit cement content than by the total chloride content in 1 m3 of concrete.
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