Emulsions were first developed in the early 1900’s and came into general use in pavement applications by the 1920’s.

Asphalt emulsion consists of asphalt, water, and an emulsifying agent. On some occasions, the emulsion may contain other additives, such as stabilizers, coating improvers, anti-strips or break control agents.

Asphalt emulsions are classified into three categories: anionic, cationic, and nonionic. In practice, the first two types are more widely used in roadway construction and maintenance. The anionic and cationic classes refer to the electrical charges surrounding the asphalt particles.

HRI, Inc.’s wholly-owned subsidiary, Whitaker Roads Corporation, offers a wide range of anionic and cationic emulsion and cut-back blends.