Effect of Different Warm Mixing Agents on the Macro-Micro Properties of Asphalt

DOI: https://doi.org/10.62517/jcte.202506204

Author(s)

Shiqiang Xu1, Zhiyuan Li2, Jianbin Sun2,*

Affiliation(s)

1Weihai City Urban Management Comprehensive Service Center, Weihai, Shandong, China 2Shandong Transportation Institute, Jinan, Shandong, China *Corresponding Author

Abstract

This study investigates the effects of three warm mix asphalt (WMA) additives—Sasobit, Leadcap, and EvothermTM-DAT—on the macro- and micro-properties of 70# base asphalt and SBS-modified asphalt. Various dosages were used to prepare different WMA binders, which were evaluated through conventional performance tests, viscosity-temperature measurements, and fluorescence microscopy. Results showed that the inclusion of WMA additives generally reduced penetration and elongation, with Sasobit having the most significant impact on microstructure, especially in base asphalt. DAT exhibited minimal influence on both macro and micro properties, indicating a more stable and uniform blending behavior. The viscosity-temperature analysis revealed that DAT provided the most stable working viscosity across different temperatures. Fluorescence microscopy confirmed that Sasobit caused microstructural changes such as network cracking in base asphalt, whereas DAT and Leadcap maintained a uniform distribution. Among the three, DAT showed the best warm mix performance and compatibility, followed by Leadcap and Sasobit. These findings provide useful guidance for the selection and application of WMA technologies in sustainable pavement engineering.

Keywords

Sasobit; Leadcap; Evotherm; Warm mixing agent; Fluorescence

References

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