Crack sealing machine is used to sealing the crack and crevices in the pavement of express ways,highways,municipal streets and airports after new opening and heavy repaired.Pavements cracks are caused by many different factors. In general, causes can be divided into load-related cracks, environment-related cracks (temperature, moisture), pavement materials problems, and cracks associated with existing roadbed-related failures. While the causes are certainly of interests, the type of crack that should not be sealed can be adequately determined by other standard descriptions, such as crack width, orientation, volume, and density.
If there are too many cracks, it is both uneconomical to seal them, and unsound from an engineering standpoint. In general, too many cracks indicate that the road is in a deteriorated state. At this point, sidewalks are more likely to be candidates for major rehabilitation or reconstruction. This method eliminates the pavement that takes into account fatigue or crocodile cracks, or serious block cracking. Even a pavement that exhibits primarily transverse cracking may be ruled out as a candidate for sealing if the cracks are too closely spaced or excessively wide. A study suggests that roads with a crack distance of no more than 25 feet should not be considered for crack routing and sealing, as this would indicate that the crack seal will not be effective in prolonging the life of the road.
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