The effects of ultrasound on the viscosity properties of water-asphalt emulsions stabilized by non-ionizable surfactants are studied. The viscosity properties of the emulsions depend on the emulsifying agent concentration and the emulsion ultrasonic treatment time. Competing processes of dispersion and coagulation of particles, which affect the ultimate properties of the emulsion, occur during the ultrasonic irradiation. This fact dictates the need for selecting the optimum ultrasonic irradiation time for ensuring that the asphalt emulsions are highly disperse and approach a monodisperse state.