What is the importance of sealing asphalt cracks?
Proper attention to cracks will prevent problems from spreading, and extend the life of the pavement. Treating the problem while it is still small will pay big dividends later by delaying costly resurfacing.
What causes asphalt to crack?
Asphalt cracking is caused by both the freeze/thaw cycle as well as the effects of the sun and moisture.
The sun oxidizes asphalt cement, causing shrinkage and creating separations which lead to cracks. Moisture is then able to reach the pavement’s subsurface and soften it. Surface traffic soon begins to deteriorate the pavement around the crack, creating a larger problem,…the pothole.
Existing cracks are cleaned by compressed air. Cracks may also be routed to create a reservoir for additional material. This allows for greater expansion and contraction of the pavement without cracking.
A hot liquid asphalt cracksealing material is then applied to the cracks.
A squeegee is used to “band” the crack and blend the material with the existing pavement