What is the main purpose of using joint sealing in pavements?

The primary purpose of joint sealing in pavements is to prevent water and debris from infiltrating the joints, which can lead to various forms of damage. When water enters the joints, it can freeze and expand during cold weather, causing cracks and degradation of the pavement structure. Additionally, debris accumulation can lead to other issues such as pavement displacement or structural weakness. Sealing the joints effectively maintains the integrity of the pavement by blocking these harmful elements, ultimately extending the lifespan of the pavement and reducing maintenance costs over time.

While enhancing aesthetic appeal, reducing noise levels, and improving speed limit visibility are important aspects of pavement design and maintenance, they do not represent the primary technical function of joint sealing, which is crucial for structural protection.