This study is an experimental program developed to estimate the effect of size on the shear performance of reinforced concrete (RC) beams with stirrups made from recycled coarse aggregates (RCA). The test was conducted on eight RC beams with shear reinforcement, and the main variables were section size and RCA replacement ratio (Rr = 0% or 30%). The tension reinforcement ratio (ρ = 0.012), shear span-to-depth ratio (a/d = 1.5), and width-to-depth ratio (h/b = 1.5) were fixed. Empirical test results, theoretical results, and code calculations were compared for each specimen. The results demonstrated that the empirical test results of each sample compared favorably with the theoretical calculations within a sufficient safety margin (1.32-2.61). Also, a comparison between RCA-RC beams with Rr = 30% and RC beams containing natural coarse aggregates (NCAs) showed that the two beams exhibited similar load-displacement curves and shear strengths. Consequently, RCA-RC beams made using a RCA replacement ratio of up to 30% do not cause safety or serviceability problems.

• 이호경(금오공과대학교 건축학부 건축공학과) | Ho-Kyung Lee (Department of Architectural Engineering, Kumoh National Institute of Technology)
• 공효명(금오공과대학교 건축학부 건축공학과) | Hyo-Myeong Gong (Department of Architectural Engineering, Kumoh National Institute of Technology)
• 백승민(금오공과대학교 건축학부 건축공학과) | Seung-Min Baek (Department of Architectural Engineering, Kumoh National Institute of Technology)
• 김우석(금오공과대학교 건축학부 건축공학과) | Woo-Suk Kim (Department of Architectural Engineering, Kumoh National Institute of Technology)
• 곽윤근(금오공과대학교 건축학부 건축공학과) | Yoon-Keun Kwak (Department of Architectural Engineering, Kumoh National Institute of Technology) Corresponding author