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Title |
Effect of Initial Flexural Crack on Resistance to Chloride Penetration into Reinforced Concrete Members
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Authors |
양은익 ; 진상호 ; 김명유 ; 최윤석 ; 한상훈 |
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Keywords |
균열 ; 염소이온 ; 확산계수 ; 임계균열폭 ; 자기복원 Crack ; Chloride ion ; Diffusion coefficient ; Critical crack width ; Self-healing |
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Abstract |
In this study, the chloride penetration tests were performed for the initially cracked reinforced concrete members. The chloride diffusion characteristics and the critical crack width are compared, and the properties of self-healing are investigated. According to the test results, the chloride penetration resistance was greatly reduced as the surface crack width increased. When the mineral admixtures are added, the chloride penetration resistance of uncracked specimens were effectively increased, however, in case of the blast furnace slag and fly ash, the cracked specimens showed the more reduced resistance than OPC case, inversely. Also, the critical width was 29㎛, on average, for immersion test. The crack width with 4∼15㎛ was restored by self-healing, The parts restored by self-healing were seemed to be visually restored, however, the chloride penetration resistance was not restored, perfectly.
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