The synchronous gravel sealing layer is to use special equipment, namely synchronous gravel sealing truck and binding material (modified asphalt or modified emulsified asphalt to be spread on the road simultaneously, and formed by natural driving roller compaction or tire roller compaction. The single-layer asphalt macadam wear layer is mainly used as the surface layer of the road surface, and can also be used for the surface construction of low-grade highways.

The synchronous crushed stone seal layer concentrates the spraying of the adhesive and the spreading of the aggregate on the trolley at the same time, so that the crushed stone particles can immediately contact the newly sprayed adhesive. At this time, because the hot asphalt or emulsified asphalt has better fluidity, it can be buried deeper in the binder at any time. 

The synchronous crushed stone sealing technology shortens the interval between the binder spraying and the aggregate spreading, increases the coating area of the aggregate particles and the binder, makes it easier to ensure a stable proportional relationship between them, and improves work efficiency. Reduce equipment cultivation and reduce construction costs.

After the asphalt pavement is treated with a synchronous gravel seal, the pavement has good anti-skid performance and anti-seepage performance, which can effectively cure road surface diseases such as oil lean, particle drop, minor net cracks, rutting, and subsidence. Preventive maintenance and restorative maintenance.

This new maintenance technology can be used for both highways and ordinary highways. In the United States, it has been recorded that synchronous sealing at any time can extend the service life of roads by more than 10 years; research by relevant Australian institutions has shown that synchronous gravel sealing technology can increase the life of roads with severe damage by 10-15 years. The synchronous gravel seal technology mainly has the following characteristics;

(1) The synchronous gravel seal is essentially an ultra-thin asphalt gravel surface treatment layer bonded with a fixed-thickness asphalt film (1~2m). Its overall mechanical characteristics are flexible, which can increase the crack resistance of the road surface and heal the road surface. Cracking of the pavement, reducing reflection cracks on the pavement, and improving the anti-seepage performance of the pavement. It can extend the service life of the pavement for more than 10 years when used for road maintenance. The effect is better if polymer modified binder is used.

(2) The synchronous gravel seal layer can greatly improve the friction coefficient of the original road surface, that is, increase the anti-skid performance of the road surface, and can restore the smoothness of the road surface to a certain extent;

(3) By adopting the construction method of local multi-layer paving of stones of different sizes, the synchronous gravel seal can effectively cure diseases such as rutting and subsidence of more than 10cm in depth, which is incomparable to the attempted maintenance method;

(4) The synchronous gravel seal can be used as a transitional pavement for low-grade highways to alleviate the serious shortage of funds for highway construction;

(5) The synchronous gravel seal process is simple, the construction speed is fast, and the traffic can be opened at the speed limit immediately;

(6) Whether it is used for road maintenance or as a transitional pavement, the performance-to-price ratio of the synchronous gravel seal is significantly better than other surface treatment methods, thereby greatly reducing road maintenance costs.