What is the purpose of using additives in asphalt mixtures?

The purpose of using additives in asphalt mixtures is primarily to improve performance characteristics. Additives can enhance various aspects of the asphalt mix, including durability, flexibility, adhesion, and resistance to moisture and temperature variations. For instance, modifiers like polymers can make hot mix asphalt more flexible and better able to withstand the stresses imposed by traffic loads and environmental conditions. Additionally, certain additives can help improve resistance to rutting and cracking, ultimately leading to a longer lifespan for the pavement and reduced maintenance needs.

While enhancing color diversity might be a consideration in certain decorative applications, it does not align with the primary objectives of asphalt performance in infrastructure. Cost reduction might be a secondary outcome of using certain additives, but it is not the main goal, as many additives can add to the cost of the mix. Lastly, the aim is typically to minimize environmental impacts, not increase them, as the industry continually seeks sustainable practices in asphalt production and use.