Regarding asphalt, which statement is accurate?

The statement that air voids affect the thickness of asphalt is accurate because air voids are the small pockets of air that are intentionally left in asphalt mixtures to enhance performance and durability. These voids play a significant role in the overall composition of the asphalt.

When asphalt is compacted during the paving process, achieving the correct balance of air voids is crucial. If there are too many air voids, it can lead to an increase in thickness, as more material is needed to fill the space between the aggregates. Conversely, insufficient air voids typically mean a denser mixture, which also affects the compacted thickness.

Managing air void content is important because it impacts the overall quality of the asphalt, affecting various characteristics such as soil stability, permeability, and resistance to moisture. Consequently, effective management of air voids is essential in asphalt design and helps ensure the longevity and effectiveness of paved surfaces.