Why is it important to control the temperature of the asphalt binder during mixing?

Controlling the temperature of the asphalt binder during mixing is crucial to ensure proper coating of aggregates and prevent hardening. When the temperature of the asphalt binder is within the optimal range, it becomes more fluid, allowing it to effectively coat the aggregate particles. This coating is essential for achieving good adhesion between the binder and the aggregates, which contributes to the overall durability and performance of the asphalt mixture.

If the binder is too cold, it may not coat the aggregates adequately, leading to weak points in the pavement structure. This can cause early failure of the asphalt layer. On the other hand, if the binder temperature is too high, it can lead to issues such as excessive oxidation, which hardens the binder over time and negatively affects its performance. Therefore, maintaining the appropriate temperature is key to achieving a high-quality asphalt mix that is both functional and long-lasting.