Abstract
With the gradual shift of high-grade highways in China from construction to maintenance, higher performance requirements have been placed on asphalt binders. High-content SBS modified asphalt has become an inevitable choice for both new pavement construction and maintenance. However, conventional high-content SBS modified asphalt suffers from high energy consumption, excessive carbon emissions, and poor construction workability. In this study, a self-developed warm-mixed additive was introduced into high-content SBS modified asphalt, and the process was optimized to obtain warm-mixed SBS modified asphalt. The effects of the additive on the asphalt performance and the warm-mix efficiency were evaluated in terms of viscosity-temperature characteristics, rheological properties, and thermal properties, while the viscosity-reduction mechanism was further revealed through microstructural analysis. The results show that when the mixing ratio of additive A to B is 2% to 1%, the warm-mixed SBS modified asphalt exhibits optimal performance. The softening point increases by 1.8℃;the ductility at 5℃ improves by 5.7 cm, and the rotational viscosity at 135℃ decreases by 0.9 Pa·s, thereby significantly enhancing construction workability. Rheological tests demonstrate that both high- and low-temperature performance meet the PG 76-22 grade requirements. Microstructural observations confirm that no new chemical substances are generated during the viscosity-reduction process; instead, the additive functions as a lubricant in the molten state to reduce viscosity through physical action and serves as a skeleton in the solid state to reinforce the binder and improve its rheological properties.
Publication Date
10-27-2025
DOI
10.14048/j.issn.1671-2579.2025.05.022
First Page
203
Last Page
214
Submission Date
November 2025
Recommended Citation
Lei, WAN; Fuqiang, DONG; Jinzhen, CHEN; Jiaqiang, CHEN; Yuhang, SONG; and Haonan, HE
(2025)
"Rheology and Microstructure of Warm-Mixed High-Content SBS Modified Asphalt,"
Journal of China & Foreign Highway: Vol. 45:
Iss.
5, Article 22.
DOI: 10.14048/j.issn.1671-2579.2025.05.022
Available at:
https://zwgl1980.csust.edu.cn/journal/vol45/iss5/22
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