How does moisture damage affect asphalt pavements?

Moisture damage significantly impacts the performance and longevity of asphalt pavements, notably through the process known as stripping. This occurs when water infiltrates the bond between the asphalt binder and the aggregates, causing the asphalt to lose its adhesive qualities. When this bond weakens, the asphalt can separate from the aggregates, leading to visible distress such as potholes and surface deterioration. Stripping is accelerated in conditions where moisture can permeate the pavement layer or where the asphalt was not adequately mixed or compacted, making it a crucial concern in pavement management and maintenance.

Other factors related to moisture, while they may affect pavement performance, do not directly result in the same damaging effects as stripping. For instance, moisture can lead to ruts or premature hardening, but these issues stem from other causes or mechanisms rather than direct bond failure between the asphalt and aggregates. Understanding moisture damage and its impact on stripping helps in formulating better design and maintenance strategies to improve asphalt pavement durability.