What is the recommended minimum temperature for compaction of hot mix asphalt?

The recommended minimum temperature for compaction of hot mix asphalt is 250°F (121°C). This temperature is critical to achieve optimal density and durability in the asphalt pavement. Compaction at this temperature ensures that the asphalt binder remains sufficiently fluid, allowing for better maneuvers with the compactor and thus achieving adequate interlocking between the aggregate particles. Insufficient temperatures can lead to inadequate compaction, resulting in a surface that is prone to deformation, raveling, and reduced overall performance. This is why maintaining the right temperature during compaction is essential for the longevity and effectiveness of asphalt pavements.

The other temperature options would either be too low, potentially leading to poor compaction results, or unnecessarily high, which could harm the asphalt mix and equipment used for compaction.