Attab, M., Abdulqader, S., Mohsen, M. (2025). Flexural behavior of reinforced recycled concrete coarse aggregates rectangular beams with and without splice bars. , 43(5), 270-282. doi: 10.30684/etj.2024.153907.1823
Muslim R. Attab; Sarmad S. Abdulqader; Makki K. Mohsen. "Flexural behavior of reinforced recycled concrete coarse aggregates rectangular beams with and without splice bars". , 43, 5, 2025, 270-282. doi: 10.30684/etj.2024.153907.1823
Attab, M., Abdulqader, S., Mohsen, M. (2025). 'Flexural behavior of reinforced recycled concrete coarse aggregates rectangular beams with and without splice bars', , 43(5), pp. 270-282. doi: 10.30684/etj.2024.153907.1823
Attab, M., Abdulqader, S., Mohsen, M. Flexural behavior of reinforced recycled concrete coarse aggregates rectangular beams with and without splice bars. , 2025; 43(5): 270-282. doi: 10.30684/etj.2024.153907.1823

Flexural behavior of reinforced recycled concrete coarse aggregates rectangular beams with and without splice bars

Engineering and Technology Journal
Volume 43, Issue 5, May 2025, Pages 270-282    PDF (1.06 M)
Document Type: Research Paper
DOI: 10.30684/etj.2024.153907.1823
Authors
Muslim R. Attab* ; Sarmad S. Abdulqader; Makki K. Mohsen
Civil Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.
Abstract
Interest in using recycled concrete aggregate (RCA) as a partial or full replacement for natural coarse aggregate (NCA) in concrete production has increased significantly in recent years. This shift contributes to reducing landfill usage and conserving natural resources. This study presents an experimental investigation into the behavior of sixteen rectangular beams cast with varying RCA ratios to examine the effects on ultimate load capacity and concrete strain. The beams, each measuring 1600 mm in length, 170 mm in width, and 260 mm in height, were reinforced with two longitudinal 12 mm steel bars, and 8 mm stirrups spaced at 75 mm intervals. The beams were categorized into four groups, with each group consisting of four beams containing RCA at replacement levels of 0%, 25%, 50%, and 75%, respectively. Group one beams were cast without rebar splice lengths, while the remaining three groups incorporated splice lengths of 10, 20, and 30 times the bar diameter (db), respectively. The experimental results indicate that RCA has a marginal impact on the ultimate load capacity. Specifically, for beams with a splice length of 10 db, RCA replacement at 25%, 50%, and 75% led to ultimate load reductions of 3.19%, 6.53%, and 11.7%, respectively. For beams with a 20 db splice length, the reductions were slightly lower at 2.78%, 5.05%, and 9.99%, respectively. In contrast, for beams with a 30 db splice length, the reductions were almost identical to those observed in beams without any splice length, measuring at approximately 1.59%, 2.82%, and 6.64%, respectively.

Highlights
  • Flexural tests involve sixteen beams with varying recycled coarse aggregate ratios and different lap splice lengths.
  • Beams containing RCA exhibit behavior similar to those without RCA.
  • The load-bearing capacity declines as the RCA content in the concrete mix increases.
  • An RCA ratio of 50% is more suitable compared to other ratios.
  • Concrete strain distribution across the beam cross-section decreases with higher RCA
Keywords
recycled coarse aggregate; recycled concrete; splice length; concrete strain; flexural behavior
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