Which property is important for minimizing fatigue in asphalt pavement?

Flexibility is a crucial property for minimizing fatigue in asphalt pavement because it allows the pavement to better withstand the strains and stresses caused by traffic loads and temperature changes. When asphalt is flexible, it can accommodate the movement and deformation that occur under load without cracking. As vehicles pass over the pavement, the materials experience repeated stress, which can lead to fatigue cracking if the asphalt is too rigid. A flexible pavement can distribute stresses more evenly, reducing the likelihood of failure and extending the overall lifespan of the surface.

In contrast, properties such as impenetrability relate more to moisture resistance and durability rather than directly influencing fatigue resistance. Color retention does not significantly impact the structural performance of asphalt, and while the thickness of the layer can influence overall strength and durability, it is not the primary factor in preventing fatigue-related issues. Flexibility directly affects how the material behaves under repeated loading conditions, making it the key property for minimizing fatigue in asphalt pavement.