What must be maintained during the asphalt application process?

Maintaining the height of the spray bar during the asphalt application process is crucial for achieving an even and consistent distribution of asphalt material. This control directly impacts the thickness of the asphalt layer being applied. If the spray bar is set too high, it may result in insufficient coverage and poor adhesion, leading to an uneven surface. Conversely, if it is too low, it can lead to over-application, which may waste materials and create surface irregularities.

While other factors such as the temperature of the asphalt, pressure of the spray system, and speed of the vehicle are important for ensuring the quality and effectiveness of the asphalt application, the height of the spray bar is particularly significant as it directly governs the application mechanics. Keeping the spray bar at the correct height ensures that the application meets the specified design and performance requirements, which is critical for road longevity and integrity.