When pavements fail they fail often by cracking. This can be caused by aging and embrittlement, low temperature effects, fatigue, or movements in the base caused by shrinkage or exiting cracks below the pavement surface. In many situations the best way to seal the surface again is by filling the cracks with an elastomeric asphaltic compound. Generally cracks that are 7-15mm are candidates for crack filling. Fatigue cracks are usually an intense pattern and more suited to overall treatments like asphalt rubber chip seals or Cape Seals.
What is it used for?
Crack Sealing is used as a preparation treatment before another type of surfacing, for example slurry, hot mix overlay or asphalt rubber seal.
How is Crack Sealing completed?
1. The cracks are routed to remove debris and any weak material.
2. The cracks are cleaned with compressed air.
3. Crack sealer is poured or injected into the crack with a spray device.
4. The surface is finished with a shoe leveler or similar device on the spray wand.
5. The surface may be sanded, especially in the case of emulsion crack filler. Unwashed sand or grit is suitable. Emulsion crack fillers must be fully cured before overlaying. Crack sealing should not be overdone and a stage will be reached where there are too many cracks to fill and a different treatment should be considered.
What does it do?
Crack Sealing seals cracks preventing water getting into the pavement. Applied at the right time crack sealing will prevent or delay pothole formation. It should ideally be used with some sort of final overlay. Because cracks are a function of stress relaxation in the pavement, i.e. they can open up in places other than the filled areas. In instances where this is happening, an overall membrane treatment is indicated.
What does it cost?
Crack sealing is the least expensive method of road maintenance. A-1 Line striping will be pleased to estimate your job.
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