Adding closed-cell perlite to asphalt primarily serves to provide thermal insulation, reduce weight, enhance stability, and improve durability.
Closed-cell perlite is an inorganic, lightweight material with a glassy outer shell and a hollow internal structure. Adding it to asphalt significantly improves the overall performance of the asphalt mixture, making it particularly suitable for use as insulation layers, waterproofing layers, or modified asphalt materials in road engineering.

