What is the typical rate of application for a bituminous tack coat?

The typical rate of application for a bituminous tack coat usually refers to the penetration grade of the associated bituminous material. In this context, a penetration grade around 0 to 30 is commonly used in practice for bituminous tack coats.

This range is appropriate because the tack coat serves as a bonding agent between layers of asphalt pavement, and the penetration grade indicates the viscosity and adhesive properties of the material. A penetration grade of 0 to 30 strikes a balance between being sufficiently sticky to adhere new asphalt to the existing pavement while remaining workable and capable of spreading properly during application.

This grade typically ensures that the tack coat adheres effectively without becoming overly stiff or unmanageable, which could compromise the bonding strength of the adhesive layer. Thus, the choice of 0 to 30 penetration grade reflects the standard practices in the field for ensuring optimal performance of bituminous tack coats.