Sweeping the cracks and pouring the heated bitumen directly from the oil can is a method that has been used for many years. However, it often occurs that the injected asphalt cannot enter the depth of the crack after cooling, and it is easy to be taken away by the wheel before it is bonded to the cold old oil surface. Nowadays, road joint glue is widely used. The road joint glue has simple pouring process, fast curing speed, high bonding strength and good toughness after curing. Reach low temperature -30 crack resistance, high temperature 80 degrees does not flow, strong stability. Good acid and alkali resistance, waterproof, oil-proof and dust-proof, heat-resistant and atmospheric aging resistance. Has good tensile, compressive and adhesive strength.
With the continuous development of domestic road material technology, seaming technology has become a new type of crack repair method that has gradually emerged. The seam tape is also known as the caulking tape. The seam tape is suitable for the treatment of fine cracks in the pavement.
2. Emulsified asphalt slurry seal
The mixture of asphalt, water and chemical substances is formed into a suspension under the action of strong mechanical shearing force, that is, it is turned into a black fluid by a colloid mill to form an emulsified asphalt. In the process of laying the slurry seal, the emulsified asphalt will penetrate into the cracks, and after the demulsification water evaporates, the purpose of repairing the cracks is achieved.
3. Asphalt mixture overlay method
This is a method that is selected according to the severity of road cracks, combined with the use interval of the road section and when the traffic volume is large. The standard medium-grained and fine-grained asphalt concrete is commonly used as the covering material, with a general thickness of 1.5 to 4.0 cm. Before laying, the sticky asphalt is sprayed on the original road.
Although the sealing layer method and the overlay method can be constructed by mechanization, the asphalt mixture at the crack cannot be touched, and the performance cannot be improved. In addition, the thickness of the overlay layer is limited, and the crack often occurs on the surface layer after the seal layer and overlay. Appear.
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