The influence of polymer modifier on bitumen pavement performance is mainly reflected in the following aspects:

1. Anti-aging performance: The polymer molecules in the polymer modifier can interact with the components in the bitumen to form a stable network structure, thereby slowing down the aging rate of the bitumen and extending its service life.

2. Water resistance: The polymer molecules in the polymer modifier can interact with the water in the bitumen to form a water barrier, preventing water from infiltrating into the bitumen and reducing the softening and damage of the bitumen.

3. Shear resistance: The polymer molecules in the polymer modifier can interact with the components in the bitumen to form a network structure, increase the cohesion and shear resistance of the bitumen, and improve the stability and durability of the bitumen.

4. Anti-slip performance: The polymer molecules in the polymer modifier can interact with the components in the bitumen to form a network structure, increase the anti-slip ability of the bitumen, reduce the slip of the road surface and the risk of vehicle accidents.

5. Cracking resistance: The polymer molecules in the polymer modifier can form an elastic structure in the bitumen, increase the elastic modulus of the bitumen, improve its cracking resistance, and reduce the cracks and damage of the road surface.

In summary, the polymer modifier changes the structure and properties of bitumen by interacting with the components in bitumen, thereby improving the road performance of bitumen and prolongs its service life.

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