What does the term "lift" refer to in asphalt paving?

In the context of asphalt paving, "lift" specifically refers to a single layer of asphalt that is applied to the surface. Each lift is essentially a distinct application of asphalt material, and multiple lifts can be used to achieve the final desired thickness of the pavement.

The concept of lifts is critical as it allows for controlled placement and compaction of the asphalt, ensuring that each layer adheres properly to the layer below and achieves the necessary density and strength. This layered approach contributes not only to the structural integrity of the pavement but also to its durability over time.

The other choices relate to different aspects of asphalt paving. The total thickness of the pavement encompasses all the lifts combined but does not define what a lift is. The equipment used for laying asphalt refers to the machinery like pavers and rollers, which assist in the application process. Lastly, cooling time pertains to how long the asphalt takes to set and solidify, which is essential in its own right but does not define the term "lift." Therefore, understanding that a lift is a singular application helps clarify its role in the overall paving process.