What characteristic is defined by the viscosity of the binder at different temperatures?

The viscosity of the binder at different temperatures defines the flow characteristics of the material. Flow characteristics indicate how the binder behaves under various conditions, particularly in terms of how it flows and deforms. Viscosity is a measure of a fluid's resistance to flow; it is influenced significantly by temperature. As temperature increases, the viscosity typically decreases, allowing the binder to flow more easily, which is essential during the mixing and laying down of hot mix asphalt. Understanding the flow characteristics is crucial for ensuring proper compaction, durability, and overall performance of the asphalt pavement. This aspect is critical for maintaining the integrity of the asphalt as it must accommodate various loads and environmental conditions over time.