Journal of Transportation Research

Journal of Transportation Research

Investigation on the Mutual Effect of PPA and EBS on High- and Low-Temperature Performance of Bitumen

Document Type : Original Article

Authors
Mohammad Rahi 1
Behzad Rasouli Esfanjani 2
Yousef Yousefi Mazrae 3
Pouria Hajikarimi 4
1 M.Sc., Grad., Director of Department of Research & Development, Pasargad Oil Company, Tehran, Iran.
2 B.Sc., Grad., Quality-Control Supervisor of Laboratory, Pasargad Oil Company, Tabriz, Iran.
3 B.Sc., Grad., Laboratory Expert, Pasargad Oil Company, Tabriz, Iran.
4 Assistant Professor, Department of Civil & Environmental Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
10.22034/tri.2023.391482.3142
Abstract
Using Ethylene Bis(Stearamide) (EBS) decreases mixing and compaction temperature of bitumen and consequently decreases energy consumption of asphalt mixture production. In this study, polyphosphoric acid (PPA) is added to EBS-modified bitumen to mitigate low-temperature deteriora-tion of EBS. Also, the effect of adding PPA and EBS on high-temperature behavior of bitumen is investigated using supepave protocol and multiple stress creep and recovery (MSCR) test. For this purpose, PPA is added to EBS-modified bitumen (having 3% of EBS) in three different dosages of 0.5, 1, and 1.5% (based on the original bitumen weight). Then, using a dynamic shear rheometer, both superpave protocol test and the MSCR test are performed on all samples at high temperatures. Also, using a bending beam rheometer, the low-temperature behavior of all samples are evaluated. The results showed that while adding 0.5% of PPA did not change mixing and compaction tempera-ture of EBS-modified bitumen significantly, it can improve high-temperature behavior of bitumen. However, MSCR results showed that it is required to consider the high-temperature behavior of modified bitumen conservatively as the bitumen modified with 0.5% PPA and 3% EBS cannot meet standard requirement for three traffic categories.
Keywords
Polyphosphoric Acid
Ethylene Bis(Stearamide)
Creep-Recovery
High and Low Performance Temperature
MSCR
Subjects
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