【摘要】 为了低碳高效地资源化利用工程渣土，采用碱激发材料来固化工程渣土，研究不同碱激发剂激活矿渣/粉煤灰对所得固化土的工作性能、抗压强度、表观密度和线收缩的影响，采用XRD和SEM分析固化土的矿物相和微观形貌，最后分析不同配方固化土的碳排放和碳强比．结果表明：利用碱激发材料固化渣土可得到强度大于10 MPa、密度约1 700kg/m³、线收缩小于1%的建筑材料，固化土的反应产物主要为C-A-S-H、C-S-H和碳酸钙．矿渣的固化效果强于粉煤灰，且碳排放和碳强比更低（约2.2～4.8 kg CO₂ e/（t·MPa））．标准养护条件下，相较于水玻璃和氢氧化钠，使用硅灰替代水玻璃，会使固化土的流动性降低4%～5%、抗压强度降低41.9%、碳排放降低41%～43%，但碳强比基本不变；使用生石灰作为激发剂，会使固化土的流动性降低18%～19%、抗压强度降低23.9%、碳排放降低64%～66%，并降低碳强比，但需要养护来保证生石灰的激发效果．更多还原

【Abstract】 To achieve low-carbon and efficient resource utilization of construction spoil（CS）, alkali-activated materials were employed to solidify CS. The effects of different alkali activators on the working performance,compressive strength, bulk density, and linear shrinkage of solidified CS with ground granulated blast furnace slag（GGBFS） and fly ash（FA） were investigated. XRD and SEM techniques were used to analyze the mineral phase and microscopic morphology of solidified CS. Finally, the carbon emissions and carbon-strength ratio of solidified CS with different formulations were analyzed. The results indicate that it is feasible for alkali-activated materials to solidify CS and prepare a solidified CS with a strength exceeding 10 MPa, a bulk density about 1 700 kg/m³, and a linear shrinkage below 1%. The predominant reaction products of solidified CS are C-A-S-H, C-S-H, and calcium carbonate. When GGBFS is employed as a precursor, it exhibits superior curing effectiveness compared to FA while also demonstrating lower carbon emissions and carbon-strength ratio（approximately 2.2～4.8 kg CO₂ e/（t·MPa））.Under standard curing conditions, substituting waterglass with silica fume reduced the flowability of solidified CS by 4%～5%, compressive strength by 41.9%, and carbon emissions by 41%～43%, while maintaining similar carbon-strength ratio levels. However, using quicklime as the alkali activator reduced the flowability by 18%～19%,compressive strength by 23.9%, and carbon emissions by 64%～66%. This approach also reduced carbon-strength ratio but necessitated proper curing to ensure its solidification effect.更多还原