In the context of asphalt pavement, what does "permeability" refer to?

Permeability in the context of asphalt pavement refers to the ability of water to pass through the pavement structure. This characteristic is crucial because it affects the durability and lifespan of the pavement. Water infiltration can lead to a range of issues, including the weakening of the underlying layers, potential freeze-thaw damage, and the deterioration of the asphalt itself. High permeability can allow water to drain away effectively, reducing the risk of water-related damage, while low permeability may lead to water accumulation and subsequent pavement failures.

Understanding permeability is vital for engineers and contractors when designing and constructing asphalt pavements, especially in areas prone to significant precipitation or water movement. Proper management of permeability helps in ensuring the longevity and performance of the pavement surface over time.