Crack Sealing
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When pavements fail, they fail often by cracking. Thei 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. Fatgue cracks are usually an intense pattern and more suited to overall treatments like asphalt rubber ship seals.
Crack Sealing seals cracks preventing water from 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 then the filled areas. In instances where this is happening an overall membrane treatment is indicated.
Crack seal products are used to fill individual pavement cracks to prevent entry of water or other non-compressible substances such as sand, dirt, rocks or weeds. Crack sealant is typically used on early stage longitudinal cracks, transverse cracks, reflection cracks and blck cracks. Fatigue cracks are most often to extensive to warrant filling with crack sealer; they usually require and area treatment such as a patch or reconstruction.