β-CS is the main active mineral component in Basic Oxygen Furnace slag (BOFS), while the content of β-CS in BOFS is usually limited and fluctuated, which hindered the improvement of CO capture during carbonation. To enhance the carbonation reactivity of BOFS products, different ratio of γ-CS was blended with BOFS powder and carbonated, followed by hydration curing. XRD and TGA analysis were used to determine the mineral composition of each blending group after carbonation. SEM analysis was applied to observe the microstructure, and the MIP method was used to analyze the pore size structure. The results show that the carbonation degree and compressive strength of BOFS cubes were increased by the addition of γ-CS. With 20 wt% blending of γ-CS, the carbonated BOFS obtained the optimum increasement of carbonation degree and compressive strength, reaching 39.3% and 42.4 MPa, respectively. However, the subsequent hydration reactivity of BOFS was inhibited when blended with 20 wt% of γ-CS. Despite this, the increased poorly crystalline CaCO filled the system and densified the matrix, contributing to a 17.9% increase in compressive strength of SH20 after 56 days of hydration curing.

中文翻译：

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γ-C2S共混BOFS碳化性能研究

β-CS是碱性氧气炉渣(BOFS)中的主要活性矿物成分，而BOFS中β-CS的含量通常有限且波动较大，阻碍了碳化过程中CO捕集的提高。为了提高BOFS产品的碳酸化反应活性，将不同比例的γ-CS与BOFS粉末共混并碳酸化，然后进行水合固化。 XRD和TGA分析用于确定碳化后各混合组的矿物成分。采用SEM分析观察微观结构，采用MIP法分析孔径结构。结果表明，γ-CS的添加提高了BOFS立方体的碳化度和抗压强度。当γ-CS的掺入量为20wt%时，碳酸化BOFS获得了最佳的碳化度和抗压强度的提高，分别达到39.3%和42.4 MPa。然而，当与 20 wt% 的 γ-CS 混合时，BOFS 随后的水合反应活性受到抑制。尽管如此，增加的不良结晶 CaCO 填充了系统并使基质致密化，使得 SH20 在水合固化 56 天后的抗压强度增加了 17.9%。