재생골재를 사용한 철근 콘크리트 보의 전단거동 특성 = Characteristics of the Shear Behavior of Reinforced Concrete Beams using Recycled Aggregates

다국어 초록 (Multilingual Abstract)

This study will make reinforced concrete beams using recycled aggregates, and make an analysis of characteristics by experiment. First, this study will compare and consider characteristics of mechanical behavior for the rate of recycled coarse aggregate substitution. Second, it will look into effects of the shear span to depth ratio (a/d). Also, it will present appropriate methods of appraisal for reinforced concrete beams using recycled aggregates, through comparing experiment values with prediction values of specification, because of supporting basic data for real design.
Major experimental variable was the shear span to depth ratio, which was changed from 1.5 to 3.0. For each case of variables, the rate of recycled coarse aggregate substitution was changed to 0, 30, 50, and 100 percent. The total sixteen specimens were producted and tested.
From the analysis of the test data, the following conclusions can be drawn:
Generally, reinforced concrete beams using recycled aggregates were showing a similar tendency with reinforced concrete beams using broken stones about shear behaviors. So it can be applied to real structures. Using recycled aggregates decreased in diagonal shear strength (V_c). Because Diagonal cracks appeared at 74∼79% of ultimate shear strength, but in the case of using broken stones, diagonal cracks appeared at 82% of ultimate shear strength. Shear beams under 2.0, that's value of a/d, ware sin the failure mode of deep beam. So definition of deep beam is appropriate it under 2.0, that's value of a/d, in the case of shear beams using recycled aggregate.