Hot poured steel slag (HPSS) was adopted as microwave absorber to replace partial limestone aggregate to prepare asphalt mixtures in this work. Thermal transfer characteristics of asphalt mixtures through microwave heating (MH) were discussed. Firstly, the MH capacity of HPSS with different particle sizes were studied. Then, the morphology and element percentage of HPSS were characterized with scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Subsequently, surface temperature, heating uniformity and thermal transfer characteristics were analyzed. The results show that HPSS has good microwave absorption capacity and the increment of HPSS in asphalt mixtures can increase the surface temperature. The surface temperature of asphalt mixtures with HPSS can be evidently influenced by microwave power due to the correlation between microwave energy and microwave power. Besides, the heating uniformity of asphalt mixtures decreases with the increase of HPSS content, which is mainly related to the spatial distribution and heat generating rate of HPSS. Finally, the thermal transfer characteristics of asphalt mixtures with HPSS are divided into three types according to thermal source intensity and thermal transfer efficiency. Overall, it can be used as functional asphalt mixtures to improve the sustainability of pavement because of the good microwave absorption performance of asphalt mixtures containing HPSS.

在这项工作中，采用热浇铸钢渣（HPSS）作为微波吸收剂来代替部分石灰石骨料来制备沥青混合料。讨论了沥青混合料通过微波加热的传热特性。首先，研究了不同粒径HPSS的MH容量。然后，用扫描电子显微镜（SEM）和能量色散谱（EDS）对HPSS的形貌和元素百分数进行了表征。随后，分析了表面温度，加热均匀性和热传递特性。结果表明，HPSS具有良好的微波吸收能力，沥青混合料中HPSS的增加可以提高表面温度。由于微波能量和微波功率之间的相关性，具有HPSS的沥青混合料的表面温度显然会受到微波功率的影响。另外，随着HPSS含量的增加，沥青混合料的加热均匀性降低，这主要与HPSS的空间分布和产热率有关。最后，根据热源强度和热传递效率，将具有HPSS的沥青混合料的热传递特性分为三种类型。总体而言，由于含有HPSS的沥青混合料具有良好的微波吸收性能，因此可以用作功能性沥青混合料以改善路面的可持续性。这主要与HPSS的空间分布和产热率有关。最后，根据热源强度和热传递效率，将具有HPSS的沥青混合料的热传递特性分为三种类型。总体而言，由于含有HPSS的沥青混合料具有良好的微波吸收性能，因此可以用作功能性沥青混合料以改善路面的可持续性。这主要与HPSS的空间分布和产热率有关。最后，根据热源强度和热传递效率，将具有HPSS的沥青混合料的热传递特性分为三种类型。总体而言，由于含有HPSS的沥青混合料具有良好的微波吸收性能，因此可以用作功能性沥青混合料以改善路面的可持续性。