Cracks in pavement are the early phase of asphalt failure. Although asphalt is a flexible pavement, cracking is a normal occurrence. Cracks allow water to penetrate into the sub base which will eventually lead to pavement failure. Hot pour crack sealant is ideal for asphalt because it has superior elasticity, bonds well, and is black in color. Hot pour sealant expands and contracts through seasonal temperature changes and can keep cracks sealed for many years.
Crack sealing to be completed on cracks 1/8" and
larger. If there is vegetation in the cracks, a water-based weed killer
should be applied at least one week prior to crack sealing.
Clean cracks with a combination of power braided wire wheel, forced air and hand tools.
Cracks must be dry before being filled. The temperature should be above 32ºF degrees.
cracks with rubberized crack sealant, such as Crafco 532 or equivalent.
The sealant should be a hot-applied modified asphalt product heated in
an oil-jacketed double boiler to 400ºF degrees and agitated. AC-20,
roofing material, or any type of asphalt cut back is not acceptable.
material should be applied to the cracks with a walk-behind bander so
it is flush with the pavement. The material should be banded a uniform
width of approximately. 4 inches.
stay off of the fresh sealant for at least 15 minutes. If the area
needs to be opened or is a high traffic area, the material should be
dusted with black sand.
If sealcoating is part of the project, the crack sealing should be completed prior to the sealcoating.