What is the main function of an asphalt emulsion?

The main function of an asphalt emulsion is to serve as a binder for aggregate materials. In road construction and maintenance, asphalt emulsions consist of fine droplets of asphalt that are suspended in water, along with emulsifying agents. This allows for easier application of asphalt in various circumstances, such as when installing or repairing surfaces at lower temperatures compared to traditional hot mix asphalt.

As a binder, the asphalt emulsion effectively coats the aggregate particles, providing cohesion and adhesion, which are crucial for creating a durable and stable pavement structure. This binding capability allows the asphalt mixture to set and cure properly, forming a strong bond that contributes to the long-term performance of the paving materials.

The other options, while associated with asphalt in some contexts, do not capture the primary purpose of asphalt emulsions as effectively as the function of binding aggregate materials does.