Abstract: To study the effect of steel slag replacing natural aggregate on the rutting resistance of asphalt mixture at high temperature conditions, asphalt mixtures with different steel slag contents were prepared firstly by replacing basalt coarse aggregates with equal volumes of steel slag and their thermal physical parameters were tested. Meanwhile, the cooling effect of steel slag asphalt mixture were also evaluated by indoor equivalent heat radiation test. Then, the influence of different steel slag contents of asphalt pavement surface layer on the temperature field distribution was analyzed by using numerical simulation methods, and the creep parameters of asphalt mixture were obtained through uniaxial static creep test. Based on the above temperature field, the rutting analysis model was established to evaluate the rutting resistance of steel slag asphalt pavement. The results show that the addition of steel slag reduces the thermal conductivity and increases the specific heat capacity of asphalt mixtures, and the maximum range of change can reach over 40%. With the increase of steel slag content, the pavement surface temperature rises slightly, while the temperature at the middle and lower surface layer gradually decreases, and the cooling effect at 4 cm depth is the most obvious. When the content of steel slag reaches 100%, the temperature of pavement can decrease by 3.4 ℃ compared with that of pure basalt asphalt pavement. While, the rutting deformation of steel slag with 75% content of asphalt mixture is the smallest, decreasing by 43% compared with that of basalt asphalt mixture, which can effectively improve the rutting resistance of pavement.

Key words: highway engineering; steel slag asphalt mixture; thermal resistance; rutting resistance; finite element analysis; thermophysical parameters

摘要： 为了研究钢渣替代天然集料对沥青混合料高温抗车辙性能的影响，首先，用钢渣等体积替代玄武岩粗集料制备了不同钢渣掺量沥青混合料，对其热物性参数进行了测试，并通过室内等效热辐射试验对钢渣沥青混合料降温效果进行评价；其次，采用数值模拟方法分析了不同钢渣掺量沥青路面面层对温度场分布的影响，并利用单轴静载蠕变试验获取沥青混合料蠕变参数，建立基于上述温度场的车辙分析模型，对钢渣沥青路面的抗车辙性能进行评价。结果表明，钢渣的掺入使沥青混合料的导热系数降低，比热容增大，变化幅度最大可以达到40%以上；随着钢渣掺量增大，路表温度小幅度上升，而中下面层温度逐渐降低，其中4 cm深度处降温效果最为明显；当钢渣掺量为100%时，温度相较于纯玄武岩沥青路面降低了3.4 ℃，而75%掺量沥青混合料钢渣的车辙变形量最小，相较于玄武岩沥青混合料下降幅度达到43%，可有效提高路面抗车辙性能。

关键词: 道路工程；钢渣沥青混合料；热阻性能；抗车辙；有限元分析；热物性参数