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Title |
Evaluation of Structural Performance of Reinforced Concrete Beams According to Water Absorption of Recycled Coarse Aggregate
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Authors |
김상우 ; 한동석 ; 이현아 ; 고만영 ; 김길희 |
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Keywords |
순환골재 ; 흡수율 ; RC 보 ; 휨 ; 전단 Recycled aggregate ; Water absorption ; RC beams ; Flexure ; Shear |
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Abstract |
This study estimates the flexural behavior of reinforced recycled aggregate concrete beams. Three specimens with different types and water absorption of coarse aggregates were constructed and tested. Not only all specimens were designed to be subjected to 4-point concentrated loads, but also the shear span-to-depth ratio of 2.5 was adjusted to all specimens to increase the effect of shear. A nonlinear flexural analysis considering the tension stiffening effect of concrete was performed to predict the moment versus curvature relationships of the specimens. Furthermore, a nonlinear finite element analysis considering the effect of shear was carried out to estimate the behavior of the specimens. It can be found from experimental results that the flexural strength and the crack properties of the specimens with recycled coarse aggregate having a water absorption of 6% were similar to those of the specimen with natural aggregates. The comparison between the experimental and analytical results showed that existing analytical methods can be successfully used to predict the behavior of reinforced recycled aggregate concrete beams.
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