What is a sand seal composed of?

A sand seal is indeed defined as a light application of liquid asphalt that is subsequently covered with fine aggregates, which aligns perfectly with the chosen answer. This technique is commonly employed to enhance the durability and lifespan of pavements, particularly on surfaces that exhibit minor defects.

The liquid asphalt serves to bind the fine aggregate particles to the roadway surface, creating a cohesive layer that helps to prevent water penetration and reduce the effects of traffic wear. The fine aggregates act to provide a textured surface that can improve skid resistance while also protecting the underlying pavement from the damaging effects of UV rays and weathering.

This method contrasts with other options that either suggest the use of emulsifying agents or different compositions, which are not characteristic of a sand seal. Emulsifying agents generally pertain to asphalt emulsions used for various applications but do not accurately depict a sand seal's composition, which focuses on the straightforward combination of liquid asphalt and fine aggregates.