The furnace must be capable of reaching what temperature?

The correct answer highlights that the furnace must be capable of reaching a temperature of 650°C (1200°F) for effective operation in asphalt production. This temperature is significant because it ensures that the materials used in asphalt, such as aggregates and asphalt binder, can achieve the necessary thermal properties for proper mixing and application.

At this temperature, the asphalt binder becomes sufficiently fluid, allowing it to coat the aggregates evenly and ensuring a homogeneous mix. This is crucial for achieving the desired performance characteristics of the final asphalt product, including workability, durability, and strength.

Reaching temperatures above this level can lead to degradation of the asphalt binder, which may negatively impact the quality of the asphalt mix. Therefore, 650°C stands as an optimal target that balances effectiveness and material integrity, making it the standard operating temperature for asphalt production in this context.