Xu Sheng, Xu Wen, Chen Yixing, Li Jiaqi, Li Yueguang
School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, China.
Materials (Basel). 2024 Sep 18;17(18):4572. doi: 10.3390/ma17184572.
The application of microwave heating technology can significantly enhance the water evaporation rate of emulsified asphalt mixtures post paving. To improve the microwave absorption and curing performance of these mixtures, SiC-FeO composite material (SF) was incorporated. This addition aims to enhance the microwave absorption efficiency and accelerate the curing process of emulsified asphalt mixtures under microwave heating. This study begins with an analysis of the microwave absorption principles pertinent to emulsified asphalt mixtures. Subsequently, the microwave heating temperature fields of ordinary emulsified asphalt mixture (EAM), SiC emulsified asphalt mixture (S-EAM), FeO emulsified asphalt mixture (F-EAM), and SiC-FeO emulsified asphalt mixture (SF-EAM) were simulated using COMSOL Multiphysics finite element software (COMSOL 6.2). The early strength variations in SF-EAM under different microwave heating durations were then examined through adhesion tests, leading to the proposal of a microwave heat curing process for SF-EAM. Finally, the wear resistance, water damage resistance, rutting resistance, and skid resistance of SF-EAM post-microwave curing were evaluated through wet wheel wear tests, wheel track deformation tests, and road friction coefficient tests. The results indicate that the optimal microwave heating time is 90 s, with the microwave absorption performance of the materials ranked as follows: EAM, S-EAM, F-EAM, and SF-EAM, from lowest to highest. The road performance of SF-EAM complies with specification requirements, and its wear resistance, water damage resistance, and rutting resistance are notably improved after microwave heating.
微波加热技术的应用可显著提高乳化沥青混合料摊铺后的水分蒸发速率。为提高这些混合料的微波吸收和固化性能，掺入了碳化硅-氧化亚铁复合材料（SF）。这种添加旨在提高微波吸收效率，并加速乳化沥青混合料在微波加热下的固化过程。本研究首先分析了与乳化沥青混合料相关的微波吸收原理。随后，使用COMSOL Multiphysics有限元软件（COMSOL 6.2）模拟了普通乳化沥青混合料（EAM）、碳化硅乳化沥青混合料（S-EAM）、氧化亚铁乳化沥青混合料（F-EAM）和碳化硅-氧化亚铁乳化沥青混合料（SF-EAM）的微波加热温度场。然后通过粘附试验研究了不同微波加热持续时间下SF-EAM的早期强度变化，从而提出了SF-EAM的微波热固化工艺。最后，通过湿轮磨耗试验、车辙变形试验和道路摩擦系数试验，对微波固化后SF-EAM的耐磨性、抗水损害性、抗车辙性和抗滑性进行了评价。结果表明，最佳微波加热时间为90 s，材料的微波吸收性能从低到高依次为：EAM、S-EAM、F-EAM、SF-EAM。SF-EAM的路用性能符合规范要求，微波加热后其耐磨性、抗水损害性和抗车辙性显著提高。
