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

The purpose of using anti-stripping agents in asphalt mixes is primarily to enhance adhesion and reduce moisture-related damage. Moisture can weaken the bond between the asphalt binder and the aggregate, which can lead to stripping—a process where the asphalt film detaches from the aggregate surface. Anti-stripping agents are added to prevent this from happening by promoting better bonding and cohesion of the materials, thus extending the durability and lifespan of the asphalt pavement.

This is crucial for ensuring that the pavement maintains its structural integrity and performance characteristics, especially in areas prone to wet conditions. In contrast, improving the visual color, increasing flexibility, or reducing the overall weight of the asphalt are not the primary functions of anti-stripping agents, making these options less relevant to their intended purpose.