At what minimum temperature should intermediate rolling be performed on a hot mix?

Intermediate rolling of hot mix asphalt is crucial for achieving optimal density and improving the overall performance of the pavement. This process typically requires the material to be within a specific temperature range to effectively compact the asphalt without causing damage to the aggregate or the asphalt binder.

The correct choice of 185 degrees is significant because this temperature ensures that the asphalt binder remains workable, allowing for proper compaction. At this temperature, the material retains enough viscosity for the rolling equipment to adequately compress the mix, promoting better interlock and bonding between the aggregate particles. This promotes a durable pavement structure that can withstand traffic loads and environmental conditions.

Choosing a temperature that's too low might hinder proper compaction leading to weak spots in the surface, while a temperature that is excessively high may cause the binder to become too fluid, resulting in a loss of aggregate materials and compromising the integrity of the mix. Thus, performing intermediate rolling at 185 degrees strikes an essential balance between workability and mechanical stability, ensuring the best outcome for the hot mix asphalt.