What is the purpose of anti-stripping agents in asphalt?

The purpose of anti-stripping agents in asphalt is to increase the bond between the asphalt and the aggregate under wet conditions. This is crucial because water can negatively affect the adhesion between the asphalt binder and the aggregate, leading to stripping and premature failure of the pavement. Anti-stripping agents work by modifying the chemical properties of the asphalt binder, allowing it to better withstand moisture and improving the overall durability and longevity of the asphalt mix. This is especially important in regions that experience heavy rainfall or where the resulting moisture can lead to deterioration of road surfaces over time.

The other options, while they address various characteristics of asphalt, do not relate directly to the primary function of anti-stripping agents. Enhancing the color, reducing viscosity, or increasing elasticity are separate modifications that address different aspects of asphalt performance, but they do not focus on the critical issue of moisture-related adhesion failure.