Steel slag is a calcium-rich but hydration-inactive material. Accelerated carbonation is an effective method to activate its reactivity. In this study, a kind of widely available steel slag, basic oxygen furnace slag (BOFS), was used as the sole material for fabricating dry-mixed compacts; the interactions of casting pressure, water to solid (w/s) ratio and carbonation duration were investigated in terms of their effects on CO₂ uptake and compressive strength, with the emphasis of finding the parametric interdependence and the optimized parameters. The results suggested that the casting pressure and water addition determined the framework i.e., initial air voids for BOFS activation. The initial air voids inherent in different sample preparation scenarios described the CO₂ uptake and strength behavior. It was found that the optimal casting pressure and w/s for BOFS carbonation to achieve the highest compressive strength (45.57 ± 2.10 MPa) and sequestrate considerable amount of CO₂ (9.56 wt%) were 15 MPa and 0.13, respectively. Additionally, adopting optimized parameters enabled the exemption of preconditioning and could simplify the curing process at plant setting. It was also highlighted in this study that the maximized density did not correspond to the highest strength since over compactness of the matrix could restrain the CO₂ diffusion for carbonation. Also, portlandite, brucite, larnite, tricalcium aluminate, brownmillerite and some amorphous phases were the critical reactive phase towards carbonation while metal oxides and their solid solution were inert. This study provided insight into the development of CO₂-activated BOFS-based construction products towards either environment- or property highlighted purposes.

钢渣是一种富含钙但不具有水合活性的材料。加速碳酸化是激活其反应性的有效方法。在这项研究中，一种广泛使用的钢渣，碱性氧气炉渣（BOFS）被用作制造干混压块的唯一材料；研究了浇铸压力、水固比( w / s ) 和碳化持续时间的相互作用对 CO ₂的影响吸收和抗压强度，重点是找到参数的相互依赖性和优化的参数。结果表明浇铸压力和加水决定了框架，即用于 BOFS 活化的初始空气空隙。不同样品制备方案中固有的初始空气空隙描述了 CO ₂吸收和强度行为。结果表明，BOFS 碳化的最佳铸造压力和w / s可实现最高的抗压强度 (45.57 ± 2.10 MPa) 并封存大量的 CO ₂(9.56 wt%) 分别为 15 MPa 和 0.13。此外，采用优化的参数可以免除预处理，并可以简化工厂设置的固化过程。本研究还强调，最大密度并不对应于最高强度，因为基质的过度致密会抑制 CO ₂扩散以进行碳化。此外，硅酸盐、水镁石、羊毛石、铝酸三钙、褐铁矿和一些无定形相是碳化的关键反应相，而金属氧化物及其固溶体是惰性的。这项研究提供了对 CO ₂激活的基于 BOFS 的建筑产品的开发以实现环境或财产突出目的的见解。