The difference between binder and topcoat asphalt is in the coarseness of the aggregate, the amount of bitumen, the application in different layers, and the thickness of their application. Binder asphalt (liner) with coarse aggregates of about 25 mm and less bitumen is suitable for subgrade and structural resistance and is usually 5–7 cm thick. In contrast, topcoat asphalt (surface) w... https://sazemart.com/binder-vs-topcoat-asphalt/