This work proposes to ameliorate the performance of recycled aggregate concrete (RAC) by enhancing the interfacial transition zone (ITZ). In light of this, the recycled aggregate was pre-treated by the sulfoaluminate cement (SAC) slurry and water glass (WG) solution at varying water-to-SAC (w/s) ratios and WG concentrations, respectively. The optimum modification efficiency was observed at a w/s ratio of 0.8 and a WG concentration of 3 wt%. It was found that the SAC-treatment of RA led to a layered, sandwich-shaped new ITZ which presented an overall higher microhardness compared to the normal ITZ in the reference RAC. The WG-treatment enhanced both the new and old ITZ but its modification on RAC's mechanical/durability performance was less stable than the SAC-treatment. The SAC treatment is thereby suggested to be more appropriate for RAC's modification in practical use, also considering its lower risk of alkali-silica reaction than the WG treatment.

这项工作旨在通过增强界面过渡区 (ITZ) 来改善再生骨料混凝土 (RAC) 的性能。鉴于此，回收骨料分别用硫铝酸盐水泥 (SAC) 浆料和水玻璃 (WG) 溶液以不同的水与 SAC ( w/s ) 比和 WG 浓度进行预处理。在w/s观察到最佳改性效率0.8 的比例和 3 wt% 的 WG 浓度。结果发现，RA 的 SAC 处理导致了分层的、夹心形的新 ITZ，与参考 RAC 中的正常 ITZ 相比，其整体显微硬度更高。WG 处理增强了新旧 ITZ，但其对 RAC 机械/耐久性性能的改进不如 SAC 处理稳定。因此建议SAC处理在实际使用中更适合RAC的改性，同时考虑到其比WG处理更低的碱-二氧化硅反应风险。