The technique of carbonated stabilization is an innovative method to improve the engineering performance of soft soils. However, the improvement in the engineering performance of stabilized soils with carbonized steel slag has not been studied. In addition, the effect of clay minerals on carbonation parameters and D-W cycle performance remains unknown. To this end, in this paper, three types of synthetic soils containing different clay minerals were prepared to be stabilized by carbonated steel slag. The strength performance and microstructural evolution of carbonated steel slag stabilized soils were investigated by drying-wetting (D-W) cycle tests, unconfined compression strength (UCS) tests, X-ray diffraction (XRD), thermogravimetry (TG), and scanning electron microscopy (SEM). The results showed that the compressive strength after and resistance to D-W cycles of carbonated steel slag stabilized soils were significantly improved due to carbonation treatment. The presence of clay minerals in stabilized soils led to the high values of optimum moisture content for carbonation (C-OMC). The C-OMC value of stabilized soils containing montmorillonite was higher than that of stabilized soils containing kaolinite. Montmorillonite had a higher negative effect on the D-W cycle performance of soils compared to kaolinite. This fact could be reflected by the fluctuation of UCS and mass change ratio (R_m). The main carbonation product by three types of carbonated steel slag stabilized soils was calcite, which remained stable after D-W cycles. After carbonation for 18 h, the generated calcite and carbonation degrees for three types of stabilized soils were obtained. In the microstructures of carbonated steel slag stabilized soils, the spindle-like clusters of the generated calcite appeared, which adhered to the surface of mineral particles. The aggregated degrees of the generated calcite in stabilized soils containing clay minerals tended to decrease after D-W cycles. In this work, a new type of carbonated steel slag stabilized soil was studied. The results indicated that the effect of clay minerals on the engineering characteristics of soil should be considered.

碳酸盐稳定技术是改善软土工程性能的一种创新方法。然而，尚未研究碳化钢渣对稳定土的工程性能的改善。此外，粘土矿物对碳化参数和 DW 循环性能的影响仍然未知。为此，本文制备了三种含有不同粘土矿物的合成土壤，以用碳化钢渣进行稳定。通过干湿（DW）循环试验、无侧限抗压强度（UCS）试验、X射线衍射（XRD）、热重（TG）和扫描电子显微镜研究了碳化钢渣稳定土的强度性能和微观结构演变。扫描电镜）。结果表明，碳化处理后碳化钢渣稳定土的抗压强度和抗DW循环能力显着提高。稳定土壤中粘土矿物的存在导致碳酸化的最佳含水量 (C-OMC) 的值很高。含有蒙脱石的稳定土的C-OMC值高于含有高岭石的稳定土。与高岭石相比，蒙脱石对土壤 DW 循环性能的负面影响更大。这一事实可以通过 UCS 和质量变化比的波动来反映（稳定土壤中粘土矿物的存在导致碳酸化的最佳含水量 (C-OMC) 的值很高。含有蒙脱石的稳定土的C-OMC值高于含有高岭石的稳定土。与高岭石相比，蒙脱石对土壤 DW 循环性能的负面影响更大。这一事实可以通过 UCS 和质量变化比的波动来反映（稳定土壤中粘土矿物的存在导致碳酸化的最佳含水量 (C-OMC) 的值很高。含有蒙脱石的稳定土的C-OMC值高于含有高岭石的稳定土。与高岭石相比，蒙脱石对土壤 DW 循环性能的负面影响更大。这一事实可以通过 UCS 和质量变化比的波动来反映（ř_米）。三种碳化钢渣稳定土壤的主要碳化产物是方解石，在 DW 循环后仍保持稳定。碳化18 h后，得到了三种稳定土的生成方解石和碳化度。在碳化钢渣稳定土的微观结构中，生成的方解石出现纺锤状团块，附着在矿物颗粒表面。含粘土矿物的稳定土壤中生成的方解石的聚集度在 DW 循环后趋于降低。在这项工作中，研究了一种新型碳化钢渣稳定土。结果表明，应考虑粘土矿物对土体工程特性的影响。