What is the appropriate method to protect tack coat after application?

The appropriate method to protect tack coat after application is to prevent all traffic until it is cured. Tack coat is a crucial bonding agent applied to the surface of existing asphalt or pavement to ensure proper adherence of subsequent layers. If any traffic, whether from vehicles or construction equipment, is allowed on the newly applied tack coat before it is fully cured, it can become disturbed or damaged, leading to poor bonding and potential failure of the overlay.

Allowing the tack coat to cure undisturbed ensures that it achieves the proper viscosity and bonding characteristics necessary for the successful application of the next layer of pavement. This process minimizes the risk of issues such as slippage or delamination that could result from traffic interfering with the tack coat. Therefore, ensuring that no traffic occurs until the tack coat has cured is vital for the long-term performance and durability of the roadway.

In contrast, other methods like covering with sand or placing physical barriers can provide temporary protection but do not guarantee the same effectiveness in maintaining the integrity of the tack coat as preventing traffic does. The notion that no protection is needed contradicts the established best practices for roadway application, emphasizing the importance of full curing for the tack coat's effectiveness.