What temperature should the asphalt at the time of mixing be compared to the temperature of the aggregates?

The correct response is that the temperature of the asphalt should be 14°C lower than that of the aggregates at the time of mixing. This temperature difference is important to ensure proper coating, adhesion, and blending of the asphalt with the aggregates. When asphalt is at a lower temperature compared to the aggregates, it can effectively envelop the aggregate particles, allowing for better binding and overall performance of the asphalt mixture.

This approach prevents excessive oxidation and degradation of the asphalt binder which can occur if the binder is heated too high. Maintaining the right temperature difference helps in achieving optimal workability and prevents issues such as premature stiffening or mixture segregation during the paving process.

In the context of mixing, this specific temperature difference aids in ensuring effective interaction between the materials, leading to a more durable and cohesive final product that meets performance standards.