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26 2024-04: In the blending process of bitumen and SBS, SBS particles gradually swell and form a stable mixture with bitumen because of the following reasons: according to the similarity compatibility principle, the oil content (saturation and aromatic content) in bitumen is compatible with SBS during Brownian motion, and SBS produces swelling. The polarity of the expanded SBS particles is similar to that of the gum in bitumen, and the SBS particles have incomplete compatibility with bitumen. The bitumen with less bitumenene content has better compatibility with the modifier, and the modifier absorbs part of the oil and produces swelling effect. The swelling SBS can improve the pavement performance of the base bitumen. As a result, the SBS particles gradually swell and form a stable mixture with the bitumen. The dynamic balance of bitumen and SBS blending process is achieved by crushing and coalescence process. Under a certain shear stress, the dispersed phase (SBS particles) is broken into smaller particles and coalesced at a certain speed. The smaller the particles in the dispersed phase, the higher the coalescence speed. When the rate of fragmentation and coalescence reaches equilibrium, the state of dispersed phase equilibrium will be reached. This process is a dynamic equilibrium process, through the balance of crushing and coalescence, bitumen and SBS particles can form a stable mixture.

In the blending process of bitumen and SBS, SBS particles gradually swell and form a stable mixture with bitumen because of the following reasons: according to the similarity compatibility principle, the oil content (saturation and aromatic content) in bitumen is compatible with SBS during Brownian

13 2024-04: Why is the dispersion effect of different bitumens on SBS different? What is the effect of the oil content of petroleum bitumen and blended bitumen on the dispersion of SBS?

The dispersion effect of different bitumensubstrates on SBS may be due to their different oil content. According to the description in the reference information, the oil content of petroleum bitumenis relatively small, while the oil content of blended bitumenis more. The difference

09 2024-04: Why does the penetration of modified bitumen decrease and the softening point increase? How does this affect the properties of bitumen?

The decrease of penetration and the increase of softening point of modified bitumenare due to the change of physical properties of bitumencaused by the addition of modifier. The modifier can be compatible with the gum in bitumen, absorb the saturation and aromatic content in bitumen, and

29 2024-03: Can we predict the performance and stability of modified bitumen by measuring the viscosity and temperature characteristics?

By measuring viscosity-temperature characteristics, the performance and stability of modified bitumencan be predicted. According to the research results in the reference information, the viscositytemperature characteristics of modified bitumenare different from those of ordinary bitumen,

22 2024-03: Why are the viscosity temperature properties of modified asphalt important for environmental and safety issues?

The viscosity and temperature characteristics of modified asphalt are of great significance to environmental and safety issues, mainly reflected in the following aspects:1. Too high mixing and compaction temperature will cause aging of modified asphalt: According to the research results in the refer

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