What is the primary cause of moisture damage in asphalt pavement?

The primary cause of moisture damage in asphalt pavement is indeed related to poor drainage. When water accumulates in or around asphalt pavements due to inadequate drainage systems, the moisture can infiltrate, weakening the bond between the asphalt binder and the aggregates. This process leads to stripping, where the asphalt layer starts to lose its adhesive properties, ultimately resulting in cracks, ruts, and potholes.

Effective drainage is crucial for maintaining the structural integrity of asphalt pavement by preventing the accumulation of water, which can cause various types of distress in the pavement. Good drainage systems help ensure that water quickly flows away from the pavement's surface and underlying layers, diminishing the risk of moisture-induced damage. By addressing drainage issues, the longevity and performance of asphalt pavements can be significantly enhanced.