With the rapid development of my country's economy, the country's highway transportation industry has also undergone tremendous changes. High-grade highway construction and municipal road construction have entered a rapid development phase, with asphalt concrete pavement being widely used as the mainstream structural layer. Asphalt mixing plants, as the primary equipment for producing asphalt concrete, have a direct impact on the quality and service life of asphalt pavements due to their operating conditions and product quality. Early-stage asphalt pavement defects are closely related to asphalt mixing plants.

Generally, early-stage asphalt pavement defects manifest themselves as cracks, looseness, water damage, and oil bleeding.
Asphalt Mixing Plants and Asphalt Pavements
Specific Relationship Between Early-stage Defects
Cracks: If the asphalt content in the mix produced by an asphalt mixing plant is insufficient or the aggregate gradation is inappropriate, the asphalt pavement's crack resistance will decrease, making cracks more likely to form. Once cracks develop, they accelerate the deterioration of the pavement structure and shorten its service life.
Looseness: Looseness is caused by the loss of adhesion between the asphalt and the aggregate. If the aggregate mud content in the mixture produced by an asphalt mixing plant exceeds the specified limit and segregation is severe, the bond between the aggregate particles and the asphalt will weaken, leading to loosening problems.
Water damage: Water damage is a common early-stage problem in asphalt pavements, primarily manifesting as cracks and potholes. If the asphalt mixing plant's mixing and metering accuracy is poor, the resulting mixture will have a high void content, resulting in insufficient compaction and poor adhesion between the asphalt and aggregate. This allows water to easily penetrate the pavement structure, causing water damage.
Oil bleed: Oil bleed refers to asphalt migrating upward from the mixture and accumulating on the pavement surface. This is usually caused by large deviations in asphalt metering during the production process. Excessive asphalt can reduce the pavement's skid resistance and durability, increasing maintenance costs.
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