Studies have demonstrated that basic oxygen furnace slag (BOFS) powder can be granulated to produce a strong artificial aggregate through strengthening with accelerated carbonation. However, our previous results showed that a 100% CO₂ concentration applied during granulation could significantly degrade the properties of the produced BOFS aggregate due to the loss of bridging water upon undergoing a rapid exothermic reaction. Therefore, this paper aims to optimize the CO₂ concentration during granulation of BOFS and investigate the impact on the subsequent post air or CO₂ curing of the produced aggregates. According to X-ray computed tomography results, the CO₂ applied during granulation should be controlled at 40 vol% or less in order to provide proper connective pores in freshly granulated BOFS aggregates for subsequent carbonation, thereby allowing higher CO₂ uptake and better mechanical development of hardened BOFS aggregates. It was also noted that with a high granulation-CO₂ concentration typically of 100% can result in the formation of multiple granules in a single produced BOFS aggregate, hence lowering the intrinsic structure and aggregate strength. Compared to the CO₂ reaction that occurs during granulation, post CO₂ curing plays the main role in developing the mechanical strength of hardened BOFS aggregates.

研究表明，碱性氧气炉渣（BOFS）粉末可以通过加速碳化强化来造粒，从而生产出坚固的人造骨料。然而，我们之前的结果表明，在造粒过程中施加 100% 的 CO ₂浓度会显着降低所生产的 BOFS 骨料的性能，因为在经历快速放热反应时会损失桥接水。因此，本文旨在优化BOFS 造粒过程中的 CO _{2浓度，并研究其对所生产骨料的后续空气或 CO 2}固化的影响。根据 X 射线计算机断层扫描结果，CO ₂造粒过程中施用的量应控制在 40 vol% 或更低，以便在新造粒的 BOFS 骨料中提供适当的连通孔，用于随后的碳化，从而允许更高的 CO ₂吸收和更好的硬化 BOFS 骨料的机械发展。还注意到，通常为 100% 的高造粒 CO ₂浓度会导致在单个生产的 BOFS 骨料中形成多个颗粒，从而降低固有结构和骨料强度。与造粒过程中发生的 CO _{2反应相比，后 CO 2}固化在提高硬化 BOFS 骨料的机械强度方面起主要作用。