Confinement through steel spirals can significantly improve the performance of recycled aggregate concrete (RAC). However, only a few studies are available in the literature in this context. Considering the variability of recycled coarse aggregates (RCA), more studies are needed to explore the behavior of RAC confined by steel spirals. In this study, the stress-strain behavior of steel spiral confined RAC incorporating acetic acid immersed and mechanically rubbed recycled coarse aggregates (AMRCA) is studied. For this purpose, three different concrete mix designs and three different confinement levels of steel spirals were considered. Results show that the increase of confinement level increases the peak stress, peak strain, and ultimate strain of RAC incorporating AMRCA (AMRAC). At the same confinement level, the ultimate and peak strains of all the confined AMRAC samples are noticed higher than confined NAC samples of the same series. Peak strength reduction due to the addition of AMRCA is also observed lower for confined AMRAC samples than unconfined AMRAC samples. The applicability of the stress-strain model and relationship to determine the permissible content of RCA, previously developed for steel spiral confined NAC and RAC to spirally confined AMRAC samples, is also examined.

通过钢螺旋的约束可以显着提高再生骨料混凝土（RAC）的性能。但是，在这种情况下，文献中仅有很少的研究。考虑到再生粗骨料（RCA）的可变性，需要更多的研究来探索受钢螺旋约束的RAC的行为。在这项研究中，研究了采用醋酸浸渍和机械摩擦的再生粗骨料（AMRCA）的钢螺旋承压RAC的应力-应变行为。为此，考虑了三种不同的混凝土配合比设计和三种不同的钢螺旋约束水平。结果表明，约束水平的增加会增加结合AMRCA（AMRAC）的RAC的峰值应力，峰值应变和极限应变。在相同的限制水平下 注意到所有密闭AMRAC样品的极限应变和峰值应变都高于同一系列的密闭NAC样品。对于受限的AMRAC样品，还发现由于添加了AMRCA而导致的峰值强度降低要比未约束的AMRAC样品低。还研究了应力-应变模型的适用性和确定RCA允许含量的关系，RCA以前是为钢螺旋约束NAC和RAC螺旋约束AMRAC样品而开发的。