What is the required concrete tack rate between new layers of asphalt?

The required concrete tack rate between new layers of asphalt is specified to be 0.08 gallons per square yard (±0.01). This rate ensures proper bonding between layers, which is crucial for the structural integrity and long-term performance of the pavement. By achieving this rate, you enable the new asphalt layer to adhere effectively to the existing surface, which helps prevent issues such as peeling or delamination.

Choosing this specific rate, with a slight tolerance, accounts for variations in application techniques and environmental conditions. This ensures that there is enough tack applied to facilitate a strong bond without excessive buildup that could negatively impact the pavement structure. Therefore, adhering to this standard is essential for achieving a durable asphalt surface that can withstand traffic loads and environmental factors over time.