What is the ideal moisture content range for asphalt aggregate when exiting the dryer?

The ideal moisture content range for asphalt aggregate when exiting the dryer is crucial for ensuring the quality and performance of the asphalt mixture. Maintaining a moisture content of less than 0.02% is essential because excessive moisture can lead to a number of issues, such as a weaker bond between the aggregate and the asphalt binder, which ultimately affects the durability and performance of the pavement.

When the moisture content is too high, it can also cause problems during the mixing process, potentially leading to steam formation that can create voids in the mix, resulting in poor overall compaction and reduced strength of the final product. Furthermore, controlling the moisture content ensures that the asphalt binder can properly coat the aggregate, which is key to producing a stable and homogenous mixture.

The specified limit of less than 0.02% is based on the need to minimize water in the asphalt mix while ensuring effective adhesion and overall performance of the pavement. Therefore, this moisture content range is critical to achieving the desired characteristics in asphalt mixtures.