What temperature must the asphalt be at when the two materials enter the plant mixer drums?

The requirement that the asphalt must be at least 14°C lower than the aggregates when they enter the plant mixer drums is rooted in the principles of achieving optimal mixing and performance of the asphalt concrete. This temperature difference ensures that the asphalt can adequately coat the aggregate particles without overheating, which can lead to a breakdown in the quality of the asphalt and affect the overall durability and performance of the final product.

Maintaining a lower temperature for the asphalt allows for the effective blending of materials, ensuring that the binder doesn't become too fluid or lose necessary properties. This helps in facilitating a better mixture that can be compacted properly and maintain its structure under load and temperature fluctuations. This temperature rule also accounts for the heat generated during mixing, making sure that the viscosity of the asphalt remains manageable for processing and application.

Understanding this temperature relationship is essential for those involved in asphalt production, as it directly impacts the workability of the mix and the long-term performance of the pavement.