To prevent cracking at low temperature, and The functions of asphalt binder course are The material should perform well in water-resistance. The material should have adequate resistance to both flexural deformation and shear fatigue damages due to traffic repetitions. The material should be flexible enough at low temperature. The material should have adequate resistance to deformation at high temperature. The surface texture of aggregates particles used for the wearing course should be rough so that the wearing course is able to provide adequate texture depth. To satisfy these functions, the wearing course should not only be durable, but also fulfill the following requirements: To provide an antiskid surface for riding safety within a specified period. To provide a smooth riding surface for vehicles within a specified period, and Since the function of different layers is different, the individual layer should be separately designed.
As for triple-layered asphalt layer, it consists of the wearing course, binder course, and asphalt bottom layer. As for a double-layered asphalt layer, it consists of the wearing course and binder course. Currently, the asphalt layer in pavement structures for interprovincial and provincial highways generally employ double-layered or triple-layered asphalt layers.
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