Molecular Dynamics Simulation and Experimental Study of Effective Ingredient Release Characteristics of Anti-Icing Modified Asphalt Mortar

Anti-icing asphalt pavement is widely used as an active snow melting technology for the purpose of weakening the effect of snow and ice hazards on road. However, most researches on anti-icing asphalt pavement focus on road properties and anti-icing properties verification, and there are few studies on the release characteristics of freezing point depressant effective ingredient of anti-icing modified asphalt mortar. For this reason, this study investigated the effect of anti-icing modified asphalt mortar components and temperature on effective ingredient release based on the conductivity test and molecular dynamics simulation, and analyzed the interface behaviors between asphalt mortar components and sodium chloride through interfacial energy theory, which revealed the mechanism of effective ingredient release. The results clearly showed that the early change of effective ingredient release concentration with time could be divided into two stages: rapid release and stable release. The modified asphalt mortar had the finest diffusion of effective ingredient, followed by base asphalt mortar. The effective ingredient diffusion was generally enhanced with temperature increase. The resin and aromatic components showed the strongest mutual attraction with sodium chloride.