Asphalt pavement cracks are a common disease on the road surface. If the cracks are not treated in time, the rainwater will enter the surface layer and the base layer through the cracks, and under the action of the traffic load, dynamic water will be formed to scour the structural layer, resulting in pumping or loose base layers. Such as water damage, resulting in cracks, potholes and other diseases on the road surface.
When cracks appear on the asphalt pavement, when they are first discovered, they should be dealt with in time to prevent problems before they happen. The use of asphalt road sealant to fill joints is an effective way to deal with cracks in asphalt pavement. It is recommended that road workers take measures as soon as possible. Next, we will introduce the joint filling characteristics of asphalt road sealant, performance characteristics of asphalt road sealant and construction attention points.
1. Filling characteristics of asphalt road sealant
After the cracks are slotted and before the joint glue is injected, the slot joints must be cleaned up to prevent the asphalt road sealant from being glued to the road surface and causing the glue to open or fall off. Use a high-pressure dust blower to remove the ash, Blow the soil to ensure that the asphalt road sealant is in full contact with the road surface and increase the adhesion, so that the filling effect is good, and it can be full, smooth, clean and beautiful.
The joint filling is basically not affected by the temperature during the construction period, and it can also be constructed at low temperature; the construction method is simple, easy to operate and master; the asphalt road sealant has better quality than hot asphalt filling joints, and has a long service life. Using this crack sealing machine and process for joint filling Once, the pavement can be maintained for more than two years without refilling. Compared with traditional hot asphalt manual filling once a year, the overall cost is reduced.
With better joint filling experience in future work, the use of asphalt road sealant to fill joints on asphalt concrete pavement has certain advantages not only in joint filling quality, service life, maintenance costs, etc., but also in daily highways. It has a good prospect of popularization and application in maintenance.
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YG road sealant in polyurethane
2. Material characteristics of asphalt road sealant
1) Water resistance. Asphalt road sealant itself is insoluble in water, does not absorb water, and can prevent water from penetrating from top to bottom;
2) Adhesiveness. Asphalt road sealant has strong adhesion to the road surface, and when the road surface is cold or thermally expanded, it can still be firmly bonded with it, and the adhesive surface will not be glued when it encounters water;
3) Elastoplasticity. Asphalt road sealant has good elasticity, and its stretching capacity meets the deformation requirements of cracks and joints, and can expand and contract with the pavement layer to ensure that it will not be broken;
4) High temperature stability. Asphalt road sealant will not flow due to heat in summer, pollute the road surface, affect the driving of vehicles, and can maintain a certain degree of toughness;
5) Low temperature flexibility. Asphalt road sealant does not harden or brittle at low temperature in winter, and maintains a certain degree of flexibility;
6) Anti-embedding. Asphalt road sealant can resist the embedding of sand and gravel debris under driving conditions, and ensure that the expansion and contraction of pavement joints is not hindered
7) Hot melt. Asphalt road sealant is a hot-melt material that can be heated repeatedly during use. The remaining materials in the joint filling equipment do not need to be cleaned, and can continue to be used after heating.
3. Points for attention in the construction of asphalt road sealant
1) Construction temperature
The construction temperature is one of the reasons for the peeling off of the sealant. If the road surface is wet and the temperature is lower than 4°C, the cohesive force of the asphalt road sealant will be reduced and it will fall off easily.
The overall temperature of the road surface is low. After the sealant is filled, the temperature drops rapidly, and the asphalt road sealant shrinks significantly. The temperature stress between the asphalt road sealant and the groove wall is relatively large, which will reduce the adhesion between the asphalt road sealant and the road surface. .
2) Crack humidity
The road surface should be dry when filling joints. If it is wet, the adhesion between the asphalt road sealant and the road surface will be reduced, causing part of the asphalt road sealant to fall off.
3) Keep it clean
Before filling the joints, use an air compressor to remove the dust and debris in the cracks after the slots and the loose objects around them to keep the cracks clean.
When cleaning cracks, in order to ensure that the asphalt road sealant and the crack wall are firmly bonded, the compressed air method and the wire brush method are often used to clean the cracks.
4) Filling range
If the rutting is serious, especially on the pavement with network cracks, it is not suitable to use this method to deal with cracks.
5) Filling material
The asphalt road sealant should have strong bonding ability with the seam wall, not stick to the wheel at high temperature, not brittle at low temperature, and have good durability.
6) Principles to be followed for joint filling
Asphalt pavement joint filling construction is to eliminate pavement diseases in the bud and achieve preventive maintenance. According to the long-term work experience, when using the joint filling machine to fill the joints on the asphalt pavement, the principle of filling the joints should be followed, so that every crack should not be missed to ensure the prevention of leakage.
When the crack width is more than 1cm, the effect of using asphalt road sealant is better, and when the crack width of asphalt pavement is less than 1cm, especially If the crack is less than 0.5cm, it is better to choose YG asphalt seam tape for seam treatment, because using YG asphalt seam tape for treatment will not cause artificial secondary damage to the asphalt pavement due to slotting, At the same time, it can also achieve the effect of partial micro-crack (healing).
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