In this study, the spatial and temporal evolution of mineralized steel slag compacts (MSSCs) in terms of mineral composition, microstructure, and micromechanical properties is systematically investigated to characterize and quantify their inhomogeneity. Furthermore, the impact of the inhomogeneity in MSSC on its mechanical behavior and damage mechanisms is explored to uncover the intrinsic connection between them. The results indicate that the MSSC is an inhomogeneous mass, with the extent of inhomogeneity influenced by the carbonation time. Notably, the MSSC experiences brittle damage at lower strengths and exhibits localized stress instability during loading. As the carbonation time increases from 6 to 72 hours, the mineral content and carbonation degree within the MSSCs gradually shift from an inhomogeneous to a relatively homogeneous distribution; however, the micromechanical parameters remain inhomogeneously distributed. Furthermore, the proportion of tensile cracks increases from 55.2% to 72.0%, indicating a shift in the failure mode from mixed shear-tensile damage to predominantly tensile damage in MSCC. The outer layer of the MSSC exerts a constraining effect on the inner layer, similar to the function of steel pipe in concrete-filled steel tube, effectively inhibiting deformation and damage to the inner layer.

中文翻译：

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矿化钢渣压块 （MSSC） 的不均匀性表征及其对机械性能和损伤的影响

在本研究中，系统研究了矿化钢渣压块 （MSSC） 在矿物成分、微观结构和微观力学性能方面的时空演变，以表征和量化其不均匀性。此外，探讨了 MSSC 中的不均匀性对其力学行为和损伤机制的影响，以揭示它们之间的内在联系。结果表明，MSSC 是不均匀的物质，不均匀的程度受碳酸化时间的影响。值得注意的是，MSSC 在较低强度下会遭受脆性损伤，并且在加载过程中表现出局部应力不稳定。随着碳化时间从 6 h 增加到 72 h，MSSCs 内的矿物含量和碳化程度逐渐从不均匀分布转变为相对均匀分布;然而，微观力学参数仍然分布不均匀。此外，拉伸裂纹的比例从 55.2% 增加到 72.0%，表明 MSCC 的失效模式从混合剪切-拉伸损伤转变为主要拉伸损伤。MSSC 的外层对内层起到约束作用，类似于钢管在钢管混凝土中的功能，有效抑制内层的变形和损伤。