1. Definition of Emulsified Asphalt

Emulsified asphalt is an oil-in-water asphalt emulsion product. In production, petroleum asphalt is first heated and melted, then mixed with asphalt emulsifiers (surfactants). The mixture undergoes high-speed shearing via specialized emulsified asphalt production equipment to reduce the interfacial tension between asphalt and water phases, ultimately forming a homogeneous and stable asphalt mixed emulsion. It serves as a core building material for road engineering.

Emulsified asphalt is applied in numerous scenarios including new road construction, preventive road maintenance, building waterproofing, anti-corrosion treatment and farmland soil improvement. This document focuses on road engineering and elaborates on the practical value of emulsified asphalt in highway construction.

2. Main Application Scenarios of Emulsified Asphalt in Road Engineering

2.1 Auxiliary Materials for New Highway Construction

It is applicable to standardized construction of prime coat, tack coat, slurry seal and synchronous chip seal with emulsified asphalt for road works, acting as an essential bonding material for highway base courses, waterproof layers and interlayer connection.

2.2 Raw Materials for Routine Road Maintenance

It is widely adopted in preventive maintenance technologies such as modified slurry seal, micro-surfacing, fine surfacing and cold-mix cold-laid thin overlay for pavement maintenance. Cationic emulsified asphalt features excellent adhesion to aggregates, which can repair minor pavement distresses and extend the service life of roads.

3. Complete Classification Standards of Emulsified Asphalt (Reference for Engineering Material Selection)

The industry classifies emulsified asphalt from three dimensions to match various road construction working conditions:

1. Classified by breaking speed: Rapid-set emulsified asphalt, medium-set emulsified asphalt, slow-set emulsified asphalt

2. Classified by construction application mode: Mixing-type emulsified asphalt, spraying-type emulsified asphalt

3. Classified by ionic property of emulsifiers: Cationic emulsified asphalt, anionic emulsified asphalt, nonionic emulsified asphalt, amphoteric emulsified asphalt

In summary, with advantages of convenient preparation, cold construction without heating treatment, outstanding adhesion and stable performance, emulsified asphalt is an indispensable basic building material for modern road construction and maintenance. Emulsified asphalt with different ionic types and breaking speeds fit completely different construction procedures. Before construction, select matching models according to specific processes such as prime coat, tack coat and micro-surfacing in reference to the classification standards, so as to guarantee the overall quality of road construction.