What is a fog seal?

A fog seal is a slow-setting asphalt emulsion that is diluted with water before being applied to an asphalt surface. This technique is primarily used to rejuvenate weathered asphalt pavements, prolonging their life and enhancing the performance of the surface. By applying a fog seal, the emulsion penetrates into the pavement structure, replenishing lost oils and improving the overall condition of the surface.

The choice of mixing it with water before application is critical. This dilution helps achieve a finer mist-like spray that can evenly coat the surface without creating a thick layer, which would not effectively penetrate the asphalt. This method not only seals the surface but also helps to reduce dust, enhance the curb appeal of roads, and improve skid resistance, making it a practical solution in road maintenance.

In contrast, the incorrect options refer to different practices or materials used in road construction and maintenance. A thick layer of asphalt is more characteristic of larger repair projects like overlays, while an aggregate surface treatment involves a different process that utilizes stone chips or gravel. A high-viscosity liquid used for sealing refers to materials that may be used to seal cracks but do not fit the definition of a fog seal.