What should be done when a prime coat or newly placed asphalt surface treatment mat coat is applied?

When a prime coat or a newly placed asphalt surface treatment mat coat is applied, it is typically not necessary to tack. Tack is a bonding agent used to promote adhesion between layers of asphalt. In the case of a prime coat or surface treatment, the application is specifically designed to enhance the bond with subsequent layers without the need for an additional tack.

The structure of a prime coat is intended to help the underlying material remain cohesive while also providing a surface that allows subsequent layers to adhere effectively. Since the prime coat itself serves to improve the bonding conditions, additional tacking is generally redundant and not part of standard practice. Thus, recognizing that the design of these coats and mats makes additional tack unnecessary is essential for ensuring proper application and adherence in roadway construction.