What happened to the asphalt pavement that was overloaded and lost fine materials? It has just been paved for 6 days.

Generally, it is due to thermal expansion and cold contraction, but it naturally falls off.

1. poor asphalt quality: asphalt quality plays a key role in the road performance of asphalt mixture. If the performance of asphalt is poor, such as low consistency, high wax content and poor cohesive force, it will lead to no firm cohesive adsorption between asphalt and aggregate, and the cohesive force between particles will decrease, which will eventually make the asphalt mixture loose and exfoliate.

2. Insufficient adhesion between coarse aggregate and asphalt: The adhesion between coarse aggregate and asphalt material greatly affects the strength and durability of asphalt mixture. Generally speaking, the adhesion between alkaline aggregate and asphalt is good, while the adhesion between mineral aggregate and asphalt in acidic rock often fails to meet the requirements.

3. The hydrophilicity coefficient of mineral powder is too large: the mineral powder is required to be loose and dry in asphalt mixture, and the hydrophilicity of mineral powder is required to be small in order to make the mineral powder have good adhesion with asphalt.

4. The cleanliness of fine materials is poor: at present, the commonly used fine aggregates in asphalt mixture are stone chips and machine-made sand respectively, and their cleanliness is mainly characterized by sand equivalent. The low equivalent of sand indicates that the fine material contains more dust. When this kind of fine material is mixed into asphalt mixture, it will lead to the decline of adhesive force of cement and lead to diseases such as looseness.