SBS refers to styrene-butadiene-styrene copolymer, which is a thermoplastic elastomer polymer. For modified bitumen, SBS has the following functions:

1. Improve viscosity and elasticity: SBS can increase the adhesion and elasticity of bitumen, so that it has better deformation ability and deformation resistance at high temperatures, so as to improve the adhesion and elasticity of bitumen.

2. Improve low temperature performance: SBS can reduce the low temperature brittleness of bitumen, improve its flexibility and crack resistance at low temperatures, so as to improve the performance of bitumen in low temperature environment.

3. Increase adhesion: SBS can improve the adhesion of bitumen and aggregate, enhance the bonding force between bitumen and aggregate, and thus improve the stripping resistance of bitumen concrete.

4. Improve durability: SBS can improve the aging resistance of bitumen, delay the aging process of bitumen, reduce the aging cracks and cracks of bitumen, thus extending the service life of bitumen pavement.

In summary, the functions of SBS on modified bitumen mainly include improving viscosity and elasticity, improving low temperature performance, increasing adhesion and improving durability.

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