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Title |
Analytical Study on Structural Behavior of Surface Damaged Concrete Member by Calcium Leaching Degradation
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Authors |
최윤석 ; 장용환 ; 최소영 ; 김일순 ; 양은익 |
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Keywords |
콘크리트 열화 ; 내구성 ; 칼슘 용출 ; 구조 거동 ; 유한요소해석 Concrete degradation ; Durability ; Calcium leaching ; Structural behavior ; Finite element analysis |
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Abstract |
Durability is one of the most important and attractive subjects in concrete research field because not only durability of concrete is reduced by various degradation factors but also its reduction adversely influences the structural performance and service life of concrete structure. For this reason, a considerable amount of papers associated with concrete durability have been published and those researches were mainly focused on the changes of intrinsic properties of concrete due to chemicophysical degradations. However, the relationship between durability of concrete and structural behavior of concrete member has not been well established yet. In this study, calcium leaching degradation, a cause of concrete strength reduction, was dealt with. The experiments of compressive and flexural behavior of degraded concrete member were performed to evaluate the characteristics of structural behavior according to degradation level. Finally, the results from the experiments were compared with those obtained from nonlinear FEM analysis. The results from this study clearly showed that leaching degradation leads to decrease in compressive strength and compressive behavior evolves from brittle to ductile failure pattern during the degradation process. Load capacity and flexible rigidity of the degraded RC member decreased when the degradation level increased, in compressive zone. Additionally, it was found that the values from nonlinear FEM analysis, CDP model in ABAQUS, coincided well with the experimental results.
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