Why is it important to control moisture during the mixing process in asphalt production?

Controlling moisture during the mixing process in asphalt production is crucial primarily because excessive moisture can form steam when the hot aggregates come into contact with water. This steam can create bubbles and pockets within the mixture, which may compromise the bonding between the asphalt binder and the aggregates. Proper binder adhesion is essential for the durability and performance of the asphalt pavement; if the binder does not adhere effectively due to steam interference, it can lead to moisture damage and other issues down the line, such as stripping, where the binder separates from the aggregate.

While controlling moisture is beneficial for various reasons, such as improving mixing efficiency or adjusting temperatures, the primary concern is ensuring that the binder adheres properly to the aggregates. This adhesion is fundamental to the longevity of the asphalt pavement, making it a critical focus during production.