According to reference information, the specific types of modified bitumen mainly include PE (polyethylene), SBS (styrene-butadiene-styrene), SBR (styrene-butadiene copolymer) and EVA (ethylene-vinyl acetate copolymer). The performance of these modifiers under different conditions is as follows:

1. Modifier type and performance: SBS: It is better than other modifiers in improving the softening point and shows a good modification effect. PE, EVA, SBR: Compared with SBS, these modifiers are less effective, especially in improving the softening point of bitumen.

2. Influence of external conditions: Composition of base bitumen: Due to the differences in its oil, resin, bitumenene and other components, different base bitumens show different improvements in softening point. Modifier dosage: The increase in modifier dosage is proportional to the improvement of bitumen softening point. The larger the dosage, the more obvious the improvement of softening point.

Mixing method, temperature and time: During the preparation process, factors such as stirring method, temperature and time will also affect the performance of modified bitumen.

In summary, the performance of different types of modified bitumen under different conditions varies significantly, which is mainly affected by the type of modifier, the composition of the base bitumen and the preparation conditions.

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