How must tack be applied to ensure effectiveness?

Applying tack uniformly across all layers is essential for ensuring effective adhesion between the existing pavement and the new asphalt layer. When tack is applied evenly, it creates a consistent bond surface, which is crucial for the asphalt to adhere properly. Uneven application can lead to areas where there is inadequate bond or no bond at all, potentially resulting in issues such as delamination or premature failure of the pavement. Uniform tack helps distribute stresses evenly across the surface and enhances the overall performance of the pavement.

In contrast, random application might lead to spots that lack proper adhesion, quickly applied layers can lead to uneven thickness and risk of evaporation, and applying tack too thickly can create a film that may hinder the bonding process rather than enhancing it. Ensuring a uniform application is key to achieving a strong and durable pavement structure.