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

Articles in Press

Document Type : Original Article

Authors

1 Shahr-e-Ghods Branch, Islamic Azad University, Tehran, Iran

2 Department of Research & Development,, Pasargad Oil Company, Tehran, Iran

3 Pasargad Oil Company, Tabriz, Iran

4 Assistant Professor, Department of Civil & Environmental Engineering (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.

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Journal of Transportation Research

Articles in Press, Accepted Manuscript
Available Online from 15 October 2023

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