Cement-based materials have favorable capacity of solid waste and CO₂ disposal. In this study, a synergistic CO₂ treatment, including CO₂ mineralization of steel slag admixture and carbonation curing of cement paste, was proposed. The influence of synergistic CO₂ treatment on pozzolanic activity of steel slag, CO₂ sequestration, and compressive strength of specimens were investigated. Results show that synergistic CO₂ treatment cannot significantly increase the compressive strength but can improve the CO₂ sequestration efficiently (up to 10.76 %), while a single CO₂ treatment could only improve CO₂ sequestration by 6.75 %. MIP, ²⁹Si NMR, XRD-rietveld, and Raman spectroscopy were used to determine the effect of synergistc CO₂ treatment on microstructure and mineral composition of samples. A barrier layer generated on the surface of steel slag particle was observed in SEM images. This barrier layer composed of carbonates reduces the early activity of CO₂ mineralized steel slag.

水泥基材料具有良好的固体废物和CO ₂处理能力。本研究提出了_{一种协同CO 2}处理方法，包括钢渣掺合料的_{CO 2}矿化和水泥浆的碳化固化。_{研究了协同CO 2}处理对钢渣火山灰活性、CO ₂封存和试样抗压强度的影响。结果表明，协同CO ₂处理不能显着提高抗压强度，但可以有效提高CO ₂封存量（高达10.76 %），而单一CO ₂处理只能提高CO ₂封存量6.75 %。MIP、²⁹ Si NMR、XRD-rietveld 和拉曼光谱用于确定协同CO ₂处理对样品微观结构和矿物组成的影响。在SEM图像中观察到钢渣颗粒表面生成了阻挡层。_{该由碳酸盐组成的阻挡层降低了CO 2}矿化钢渣的早期活性。