为研究钢渣集料微观形貌和元素组成对沥青混合料热物性的影响以及钢渣沥青面层内部温度场的变化规律，首先，通过SEM扫描电镜和EDS能谱仪对不同来源的钢渣集料进行微观形貌分析并获取元素组成；然后，采用自行研制的测量系统测定钢渣沥青混合料的热物性参数，并结合有限元分析软件建立钢渣沥青面层模型，分析夏季高温条件下面层内部温度场变化规律。结果显示，热泼工艺处理的钢渣表面陈化结晶产物较多、粗糙程度较大、微孔较多；不同产地的钢渣中均含有大量的O元素和Ca元素，且O元素普遍高于Ca元素，尤其在热泼工艺处理的钢渣中表现得更为明显，同时金属元素的成分占比也存在较大差异；部分金属元素含量较高的热泼钢渣其传热性能却低于金属元素含量较低的热闷钢渣；白天路面吸热，面层内部温度随着深度增加而降低，并与材料的导热系数和热扩散系数呈正相关；夜晚路面放热，面层内部温度随深度增加而升高，并与材料的比热容呈正相关。说明钢渣沥青混合料的传热性能受钢渣微观形貌的影响大于元素组成的影响，且传热性能和储热能力成反比，面层内部温度场在白天和夜晚的变化过程互逆。

To study the influence of the microtopography and elemental composition of steel slag aggregates on the thermal physical properties of asphalt mixtures and the variation law of the internal temperature field of the steel slag asphalt surface layer, firstly, this paper analyzed the microtopography of steel slag aggregates from different sources and obtained the elemental composition through SEM scanning electron microscopy and EDS energy spectrometer. Then, a self-developed measurement system was used to determine the thermal properties of steel slag asphalt mixture. Combined with the finite element analysis software, a steel slag asphalt surface layer model was established to analyze the variation law of the internal temperature field of the surface layer under the high-temperature conditions in summer. The results show that the hot-pouring process for treating steel slag results in more surface aging crystallization products, greater roughness and more micropores. Steel slag from different origins contains a large amount of O and Ca elements, and the O element is generally higher than the Ca element, especially in the steel slags treated by the hot-pouring process, which is more obvious. At the same time, the composition proportion of metal element also varies greatly. The heat transfer performance of some hot-poured steel slag with a relatively high content of metal elements is lower than that of hot-sealed steel slag with a relatively low content of metal elements. During the heat absorption process in the day, the internal temperature of the surface layer decreases with the increase of depth and is positively correlated with the thermal conductivity and thermal diffusion coefficient of the material. During the heat release process at night, the internal temperature of the surface layer increases with the increase of depth and is positively correlated with the specific heat capacity of the material. The research results indicate that the heat transfer performance of steel slag asphalt mixture is more influenced by the microtopography of steel slag than by its elemental composition. Moreover, the heat transfer performance is inversely proportional to the heat storage capacity. The temperature distribution within the surface layer changes in opposite directions during the day and night.