The structural behavior of concrete beams containing recycled coarse aggregates (RCAs) was investigated in this study using detailed experimental data. Twelve concrete beams were tested in the experimental program: nine beams with varying RCA contents and three control beams with natural coarse aggregates (NCAs). The parameters for investigating the structural behavior of the RCA concrete beams under flexure were the RCA content (30%, 50%, and 100%) and tensile rebar ratio (0.50%, 0.79%, and 1.14%). The crack pattern of the RCA beams was similar to that of the NCA beams; however, the RCA beams exhibited smaller crack spacing than the NCA beams. The flexural strength was slightly affected by the RCA content. However, the ductility of the beam was not significantly influenced by the RCA content. A comparison of the experimental results and the calculations from the ACI 318 and EC 2 provisions for the flexural strength showed that the current provisions conservatively predicted the flexural strength of the RCA concrete beams.

中文翻译：

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弯曲下含再生粗骨料混凝土梁的结构性能

本研究使用详细的实验数据研究了包含再生粗骨料（RCA）的混凝土梁的结构性能。在实验程序中测试了12条混凝土梁：9条具有不同RCA含量的梁和3条具有天然粗骨料（NCA）的控制梁。用于研究RCA混凝土梁在挠曲下的结构性能的参数为RCA含量（30％，50％和100％）和拉伸钢筋比率（0.50％，0.79％和1.14％）。RCA梁的裂纹模式与NCA梁的裂纹模式相似。然而，RCA梁的裂纹间距比NCA梁小。弯曲强度受RCA含量的影响很小。但是，光束的延展性不受RCA含量的显着影响。