In this paper, the structural performance of reinforced concrete (RC) beams containing high volume ground granulated blast furnace slag (GGBFS) and recycled coarse aggregate (RCA) in replacement of Ordinary Portland cement (OPC) and natural coarse aggregate (NCA), respectively, with lime activator is studied. Nine beams of different combinations of RCA and GGBFS with/without lime and superplasticiser are designed as per IS: 456 (2000). The beams are subjected to two-point loading under universal testing machine. Various structural parameters like cracking, load bearing capacity, load vs. deflection, stiffness and energy absorption are studied. All the beams except two beams have failed in shear. These two beams, which are prepared using RCA, GGBFS, lime and superplasticiser, fail in flexure and show better structural performance than the control beam. It may be due to the reason that the above combination enhances the compressive strength of the concrete significantly, i.e. up to 16% more than that of the control mix, and consequently the shear strength. The enhanced shear strength changes the failure mode from shear failure (brittle) to flexural failure (ductile) showing better structural performance. Moreover, these two beams have shown up to 7.14%, 8.18%, 18.3%, 45% and 53.3% enhancements in cracking load, load bearing capacity, stiffness, deflection and energy absorption, respectively, as compared to those of the control beam. A comparison between the results obtained experimentally in the present investigation and predicted from different standard codes and model shows that the experimental results are in a conservative side due to which these codes/guidelines can be used safely for the GGBFS based RAC. This study clearly reveals that the concrete containing high volume GGBFS and RCA with addition of lime and superplasticiser having better structural performance in comparison to the normal can be used safely in structural applications by utilising high volume of wastes, preserving huge natural resources, reducing cement consumption and enhancing the environmental soundness due to which it can achieve sustainability in the construction industry.

在本文中，钢筋混凝土（RC）梁的结构性能分别含有高容量地面粒化高炉矿渣（GGBFS）和再生粗骨料（RCA）替代普通硅酸盐水泥（OPC）和天然粗骨料（NCA） ，用石灰活化剂进行了研究。根据 IS: 456 (2000) 设计了九根不同组合的 RCA 和 GGBFS 带/不带石灰和超塑化剂的梁。梁在万能试验机下承受两点载荷。研究了各种结构参数，如开裂、承载能力、载荷与挠度、刚度和能量吸收。除两根梁外，所有梁均发生剪切破坏。这两个梁，使用 RCA、GGBFS、石灰和超塑化剂制备，弯曲失效并显示出比控制梁更好的结构性能。这可能是由于上述组合显着提高了混凝土的抗压强度，即比对照混合物高 16%，从而提高了剪切强度。增强的剪切强度将破坏模式从剪切破坏（脆性）转变为弯曲破坏（延展性），显示出更好的结构性能。此外，与控制梁相比，这两条梁在开裂载荷、承载能力、刚度、挠度和能量吸收方面分别提高了 7.14%、8.18%、18.3%、45% 和 53.3%。在本调查中通过实验获得的结果与从不同标准代码和模型预测的结果之间的比较表明，实验结果处于保守的一面，因此这些代码/指南可以安全地用于基于 GGBFS 的 RAC。这项研究清楚地表明，与普通混凝土相比，含有大量 GGBFS 和 RCA 并添加石灰和高效减水剂的混凝土具有更好的结构性能，可以通过利用大量废物、保护大量自然资源、减少水泥消耗而安全地用于结构应用中。并提高环境无害性，从而实现建筑行业的可持续性。