Why is moisture control crucial in an asphalt plant?

Moisture control is essential in an asphalt plant primarily because it prevents steam formation, which can significantly reduce the adhesion of the binder to the aggregate. When moisture is present in the aggregate, the heat used during the production process can cause the water to turn into steam. This steam can create a barrier between the aggregate and the asphalt binder, resulting in poor adhesion.

Good adhesion is critical for the performance and durability of the asphalt mix. Without sufficient bond strength, the aggregate may not be effectively coated with the binder, leading to premature failures in the pavement, such as stripping, raveling, and reduced load-bearing capacity. Therefore, effective moisture control ensures that the binder can properly adhere to the aggregate, contributing to the overall quality and longevity of the asphalt mix.