A good time to do crack sealing is when an asphalt road or street is in fair to good condition. Along with proper drainage, crack sealing is probably the single most important maintenance activity. Most pavement distresses can be related to the intrusion of water into the pavement structure. If water is kept out of the pavement, the majority of distresses can be stopped or delayed.
Crack sealing can be done with liquid asphalt, cutbacks and asphalt emulsions and is considered temporary work. In this article, we will focus on the appropriate time to crack sealing.
Crack sealing has two primary purposes:
To prevent the intrusion of water through the crack into the underlying pavement structure.
To prevent extraneous materials from entering the crack and causing further deterioration as the pavement expands and contracts with temperature changes.
Crack sealing where cracks are subject to expansion and contraction is done using a specially prepared hot-poured sealant. Depending on the climate, the materials used, the pavement conditions and the technique used, crack sealing will last three to eight years.
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