How does moisture susceptibility affect asphalt pavement?

Moisture susceptibility significantly affects asphalt pavement by impacting the bond between the asphalt binder and the aggregate. When asphalt mix is susceptible to moisture, water can infiltrate the pavement structure, leading to a reduction in the adhesive strength of the binder. This process, often referred to as stripping, occurs when water disrupts the bond between the asphalt and the aggregate particles. As a result, the asphalt binder begins to separate from the aggregate, creating voids and weakening the overall integrity of the pavement. This condition makes the pavement more prone to early deterioration, such as cracking and raveling, ultimately leading to premature failure. Understanding the mechanisms of moisture susceptibility is crucial for designing asphalt mixes that can resist this detrimental effect, thereby ensuring the longevity and performance of the pavement.