Pavement preventive maintenance is a periodic mandatory maintenance measure that is taken to restore the service function of the pavement surface when the structural strength of the pavement is sufficient and only the surface function is attenuated. A series of new preventive maintenance technologies such as ultra-viscous fiber-added low-noise micro-surfaces and synchronous gravel seals have been widely used on the main lines of national highways, and the construction results have been widely praised by customers.

Slurry sealing uses mechanical equipment to mix appropriately graded emulsified asphalt, coarse and fine aggregates, water, fillers (cement, lime, fly ash, stone powder, etc.) and additives according to the designed ratio into a slurry mixture and uniformly It is paved on the original road surface and is firmly combined with the original road surface through the processes of coating, demulsification, water separation, evaporation and solidification to form a dense, strong, wear-resistant and road surface seal, which greatly improves the performance of the road surface.

Asphalt mixing equipment (asphalt concrete mixing equipment) all work in open-air sites, with heavy dust pollution. Many parts work in high temperatures of 140-160 degrees, and each shift lasts up to 12-14 hours. Therefore, the daily maintenance of the equipment is related to the normal operation and service life of the equipment. So how to do a good job in the daily maintenance of asphalt mixing station equipment?

Treatment of the heavy oil combustion system failure in asphalt mixing station
An asphalt mixing station (hereinafter referred to as the mixing station) used by a certain unit uses diesel as fuel in production. As the market diesel price continues to rise, the operating cost of the equipment is getting higher and higher, and the efficiency is constantly decreasing. In order to reduce production costs, it is decided to use a low-priced, combustion-friendly and qualified special combustion oil (heavy oil for short) to replace diesel as fuel.

Gravel seal technology is a thin-layer construction technique used to establish road surface functionality. The basic method is to first spread an appropriate amount of asphalt binder evenly on the road surface through special equipment, then densely distribute gravel with relatively uniform particle size on the asphalt layer, and then roll it so that an average of about 3/5 of the gravel particle size is embedded. Asphalt layer.
Gravel sealing technology has the advantages of excellent anti-slip performance and effective water sealing effect, low cost, simple construction technology, and fast construction speed, so this technology is widely used in Europe and the United States and other countries.

The surface coating is to apply a reducing agent that can partially or fully restore the performance of aged asphalt to the aged asphalt pavement. Through the penetration of the reducing agent, it penetrates into the asphalt surface layer to a certain depth and interacts with the aged asphalt paste. The polymerization reaction occurs, causing the components of aged asphalt to undergo reverse changes, restoring flexibility, reducing brittleness, and at the same time protecting unaged asphalt to delay aging. Surface coating is suitable for pavements where the asphalt pavement is obviously aging, and the pavement has a wide range of slight cracks and local looseness. There are two types of surface coatings, one is the fog seal layer and the other is the reducing agent coating. Today we will focus on understanding the fog seal layer.