What type of issues can arise from over-compacted asphalt?

Over-compacted asphalt can lead to a variety of problems that impact the performance and longevity of the pavement. One significant issue that arises from over-compaction is decreased moisture resistance. When asphalt is compacted excessively, it can lead to a denser structure that does not allow enough room for air or moisture. This can create a situation where moisture becomes trapped within the pavement layers, ultimately leading to a higher susceptibility to water damage.

As moisture infiltrates the asphalt, it can cause issues such as stripping, where the asphalt binder loses its adhesion to the aggregates. This is particularly concerning in environments subject to freeze-thaw cycles. The trapped moisture can also weaken the pavement structure, leading to premature distresses like cracking or raveling.

In contrast, increased flexibility, higher light reflectivity, and reduced costs of materials are not typically associated with over-compacted asphalt. Flexibility generally decreases with over-compaction, while light reflectivity is not directly impacted by the level of compaction. Additionally, while material costs may be influenced by different factors, they are not inherently reduced due to issues caused by over-compaction. Understanding these effects is crucial for maintaining the integrity and durability of asphalt pavements.