Which characteristic should be avoided for optimal asphalt performance?

High moisture susceptibility is a characteristic that should be avoided for optimal asphalt performance because it leads to deterioration and reduced lifespan of the asphalt pavement. When asphalt mixes are susceptible to moisture, the water can infiltrate and weaken the bond between the asphalt binder and aggregates. This can cause several issues, such as stripping, where the binder separates from the aggregate, ultimately resulting in surface instability, reduced structural integrity, and the formation of potholes or ruts.

Effective asphalt must have low moisture susceptibility to ensure it retains its mechanical properties under various weather conditions, reducing the risk of premature failure. The other characteristics—good load-bearing capacity, flexibility during temperature fluctuations, and high durability over time—are all desirable attributes that enhance the performance and longevity of asphalt pavements. High moisture susceptibility, conversely, adversely affects those desirable qualities, making it a key attribute to minimize in asphalt material selection and design.