True or False: Air voids in asphalt affect the effective thickness of pavement.

Air voids in asphalt mixtures play a vital role in determining the effective thickness of the pavement and the overall performance of the road surface. When air voids are present, they reduce the density of the asphalt, leading to a decrease in the effective thickness of the pavement.

This means that while the asphalt may appear to be a certain thickness, the presence of air voids means that the material can behave differently under load. The response to traffic and the overall durability can be negatively impacted, as more air voids can lead to moisture infiltration, which may weaken the structural integrity over time.

Thus, recognizing that air voids influence the effective thickness is crucial for optimal pavement design and maintenance. This understanding allows engineers and public works managers to account for such factors in their planning and decision-making processes, leading to better road performance and longevity.