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Repair of Cracks in Asphalt Pavement

Repair of Cracks in Asphalt Pavement

The cracks of asphalt pavement are mainly longitudinal and transverse cracks in the initial stage of use. For such cracks, joint filling technology is generally used to prevent moisture from entering the asphalt pavement and causing early damage. Artificial grouting uses the traditional manual method, that is, using a blower to clean out the debris in the seam, and then using a small spoon or hot water kettle (with a small nozzle) to heat the grouting material to the appropriate temperature into the seam.

Mechanical grouting

Joint grouting equipment 

The main sewing equipment includes slotting machine, blower, sewing machine, dryer and flattener. The effect of crack repair on asphalt pavement is closely related to material selection, crack sealing treatment design and construction technology. Therefore, in the process of road crack sealing, excellent grouting materials should be selected to improve the success rate of crack repair, so as to prolong the life of asphalt pavement.

Joint grouting technology

A) Slotting machine is used to correct grooving, tracking indicator device is aimed at cracks, pulling slotting machine backwards to slot cracks. Generally, the width-depth ratio is 1:1, and the size is controlled between 10 mm and 20 mm.

B) In order to achieve good sealing effect, the groove must be cleaned by compressed air spray gun to ensure that the groove is clean.

C) The groove is preheated by a dryer, and the moisture entering the seam is dried to ensure that the sealant is closely combined with the groove.

D) The slot opening is grouted with a slotting machine and the amount of colloid is well controlled. Practice has proved that the standard slot seaming type is more effective than the standard slot non-seaming type.

E) The seaming machine is used to move forward evenly close to the crack. Form the best seam effect;

F) Traffic will not be opened until the sealant temperature is cooled below 50 ℃.

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