Materials and Structures

, 52:9 | Cite as

Application of dispersant to slow down physical hardening process in asphalt binder

  • Yanjun Qiu
  • Haibo DingEmail author
  • Ali Rahman
  • Haoyuan Luo
Original Article


Physical hardening in asphalt binder is recognized as one of the main factors leading to premature and excessive cracking in cold regions and high-altitude areas. To slow down the physical hardening process in asphalt binder, octyl aniline (OA), which is a commonly available non-ionic dispersant, was added to the asphalt binder. The effectiveness of OA in retarding the physical hardening process of the base asphalt binder was evaluated with an extended bending beam rheometer and critical-cracking temperature tests. Further, a thermal analysis was conducted to determine the glass transition temperature. The results showed that the one-step Laplace transformation method is an alternative to the asphalt binder thermal-stress calculation. Moreover, adding a sufficient amount of OA significantly decreased the magnitude of physical hardening in the base asphalt binder. The amphiphilic structure of OA can inhibit the aggregation of asphaltenes to a certain extent, which might be the main reason leading to a lower magnitude of physical hardening in the OA-modified asphalt binder.


Octyl aniline Low-temperature Physical hardening Asphalt binder Reversible aging 



This study was supported by the National Natural Science Foundation of China under Grant 51778541. Haibo Ding is thankful to the China Scholarship Council for the financial support that was provided to study at Queen’s University, Canada.

Compliance with ethical standards

Conflicts of interest

The authors declare that they have no conflict of interest.


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Copyright information

© RILEM 2019

Authors and Affiliations

  • Yanjun Qiu
    • 1
    • 2
  • Haibo Ding
    • 1
    • 2
    Email author
  • Ali Rahman
    • 1
    • 2
  • Haoyuan Luo
    • 1
    • 2
  1. 1.School of Civil EngineeringSouthwest Jiaotong UniversityChengduChina
  2. 2.Highway Engineering Key Laboratory of Sichuan ProvinceSouthwest Jiaotong UniversityChengduChina

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