【摘要】 因马歇尔击实试验未考虑因集料种类不同而带来的沥青混合料击实特性差异，尤其是与常规天然集料有较大性能差异的钢渣集料，故需要明确马歇尔成型参数对钢渣沥青混合料的性能影响。采用不同马歇尔击实功制备钢渣沥青混凝土（SAC）和石灰岩沥青混凝土（LAC），通过分析体积参数、路用性能及内部空隙特征，研究SAC和LAC的马歇尔击实特性。设计不同马歇尔击实功（75,90,105,120,135次击实/面）制备多种SAC和LAC，并引入了级配变异性（GVR）评价不同沥青混凝土的击实特性。通过马歇尔试验、车辙试验、半圆弯曲试验等研究SAC和LAC的路用性能，并通过计算机断层扫描研究其内部空隙特征。结果表明，增加击实功会降低沥青混凝土的空隙率和内部平均孔径并改善部分路用性能，但过度击实会导致低温抗裂性能降低。LAC空隙率对压实参数更敏感，SAC则表现出更好的级配稳定性，LAC-135和SAC-135的GVR_4.75值分别为14.0%和5.3%。综合考虑空隙率、级配变异性和低温抗裂性，建议SAC和LAC的最佳击实次数分别为105和90次。更多还原

【Abstract】 The differences in compaction characteristics of asphalt mixtures caused by different types of aggregates,particularly for steel slag aggregate,which displays marked property discrepancies compared to conventional natural aggregates,is not considered in the Marshall compaction test.Clarifying the influence of Marshall molding parameters on the performance of steel slag asphalt mixture is therefore imperative.Steel slag asphalt concrete（SAC）and limestone asphalt concrete（LAC）were prepared using different Marshall compaction efforts.The Marshall compaction characteristics of SAC and LAC were investigated by analyzing their volume parameters,road performance,and internal void characteristics.Different Marshall compaction efforts（75,90,105,120,and 135 blows per side）were designed to prepare various SAC and LAC samples,and gradation variability（GVR）was introduced to evaluate the compaction characteristics of different asphalt concretes.The road performance of SAC and LAC was studied through Marshall tests,rutting tests,semicircular bending tests,and their internal void characteristics were analyzed using computed tomography.The results indicate that increasing compaction efforts reduces the void ratio and internal average pore size of asphalt concrete and improves some road performance indices,however,excessive compaction leads to a decrease in low-temperature cracking resistance.The void ratio of LAC is more sensitive to compaction parameters,while SAC exhibits better gradation stability.The GVR_4.75values of LAC-135 and SAC-135 are 14.0% and 5.3%,respectively.Considering the comprehensive effects of void ratio,gradation variability,and cracking resistance,the optimal compaction parameters for SAC and LAC are recommended to be 105 and 90 blows,respectively.更多还原