Mechanism Analysis of Emulsified Asphalt Cold Recycled Mixture

In this paper, the electrical analysis of emulsified asphalt and aggregate explains the reaction mechanism of the emulsified asphalt and aggregate. When emulsified asphalt and wet mineral aggregate contact each other, asphalt particles with a charge have chemical adsorption with aggregate at the surface of mineral aggregate, and asphalt particles are arranged on the surface of later quickly. Subsequently, asphalt of recycled mixture can be more cohesive after a series of process between emulsion and aggregate, such as demulsification and drying by distillation. A compact structure is formed by asphalt wrapping aggregate to make recycled mixture high strength. The mole - coulomb theory analyzes formation principle of emulsified asphalt cold recycled mixture strength. The strength of the recycled mixture mainly depends on the cohesion and internal friction among materials. In early stages, asphalt can not bonding because of water, which reduce the friction resistance of recycled mixture, and lead to the early strength of recycled mixture is small. After curing, the recycled mixture has the similar structure like hot asphalt mixture, which the cohesion and frictional resistance of recycled mixture became strong and the strength increased greatly. Besides, this paper expounds the dual role of cement that hydration reaction and of being active mineral powder in the process of emulsified asphalt cold recycled mixture strength formation.