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-Fe₃O₄ 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), Fe₃O₄ emulsified asphalt mixture (F-EAM), and SiC-Fe₃O₄ 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.

When it comes to mountainous expressway construction, the eye of attention usually lands on the subject of security. Performing a risk assessment of potential hazards on construction sites are critical to the on-site security.. As the disadvantages of the LEC assessment becomes more clear, in terms of evaluating hazards of mountainous expressway construction, this paper proposes the MLES risk assessment, which takes into account the degrees to which harmful factors are controlled on the construction site. Other advantages this method offers are comprehensive estimations of all kinds of losses caused by hazards whose damage is examined from such aspects as casualties, property loss, environmental damage and a given accident's impact on the construction progress. The stated comprehensive estimation enables engineers to create and enable effective counter measures to curb or control hazards. The MLES risk assessment can be used either to estimate the effects of an individual hazard, or comprehensively evaluate the risk of a work unit based on an examination of each hazard embedded in the work unit.