What aspect of asphalt mixtures do anti-strip additives primarily address?

Anti-strip additives are designed to improve the adhesion between asphalt and aggregate, particularly when moisture is present. Moisture can weaken the bond between these materials, leading to stripping, which is the detachment of the asphalt film from the aggregates. This phenomenon can compromise the integrity and durability of asphalt pavements, making the use of anti-strip additives critical in reducing moisture damage.

By using these additives, the mixture gains enhanced resistance to stripping, which results in a longer-lasting surface that withstands environmental conditions better. This is particularly essential in areas subject to high levels of moisture or where water drainage is a concern. The other options, while relevant to asphalt mixtures, do not pertain directly to the primary function of anti-strip additives. Color enhancement, weight reduction, and temperature variation are not the main focus of these materials, hence making them less relevant to the question regarding the specific role of anti-strip additives.