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Title |
Influence of Cracking and Deterioration in Compression-zone on the Flexural Behavior of RC Beam
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Authors |
문광균(Kwang-Kyun Moon) ; 전낙현(Nak-Hyun Chun) ; 최현기(Hyun-Ki Choi) ; 권성준(Seung-Jun Kwon) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.4.1 |
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Keywords |
탄산화; 염화물 침지; 압축영역; 균열; 연성비; 휨거동; 황산염 침지 Carbonation; Chloride immersion; Compressive zone; Crack; Ductility ratio; Flexural behavior; Sulfate immersion |
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Abstract |
RC structures exposed to the harsh environment exhibit degradation in serviceability and structural safety due to that in durability performance. In the study, RC beams were prepared for investigating the relationship between the compressive zone characteristics with different crack widths/depths and the flexural behavior considering deterioration conditions. Only the compressive zone was exposed to chloride attack, carbonation, and sulfate ingress, respectively, and then flexural test was performed. Regarding the flexural load after chloride attack and carbonation, no significant difference was observed from control case. However, after the sulfate immersion conditions, the flexural and initial cracking load were greatly reduced, and this tendency was evaluated to be greater with increasing crack width and crack depth. Ductility ratio decreased significantly with increasing crack depth, which showed that when the crack width was over 0.3 mm and the crack depth was over 20 mm, it decreased only to the 35% level. Regarding ultimate load, no clear correlation was derived for crack width and crack depth, however in the case of sulfate immersion case, the flexural load decreased by more than 10%.
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