Communications - Scientific Letters of the University of Zilina 2024, 26(4):D109-D121 | DOI: 10.26552/com.C.2024.050

Investigating the Characteristics of Modified Bitumen with Polyphosphoric Acid Polymers and Recycled Rubber

Sajad Chavoshi Najfabadi, Mohammad Mehdi Khabiri ORCID...*, Hamed Khani Sanij ORCID...
Department of Civil Engineering, Yazd University, Yazd, Iran

The impact of polyphosphoric acid (PPA) polymers and crumb rubber (CR) on bitumen's properties to enhance its performance was examined in this study. Laboratory samples were created with varying percentages of PPA (0.5 % to 2 %) and CR (6 % to 18 %) and subjected to extensive testing. Findings indicated that the combination of PPA and CR led to notable improvements in bitumen performance, including increased viscosity, softening point, elasticity, and recovery rates at elevated temperatures. Specifically, samples with 18 % CR and 1.0 % or 2.0 % PPA demonstrated exceptional rheological properties and strength. The optimal combination (18% CR and 1.0% PPA) resulted in a uniform structure, while the maximum CR content did not compromise bitumen integrity. Both additives effectively minimized temperature sensitivity and aging, enhancing the bitumen's performance class significantly.

Keywords: rutting resistance, modified bitumen, performance grades (PG), polyphosphoric acid polymer (PPA) waste rubber (CR) powder
Grants and funding:

We would like to thank NaftJey Oil Refinery Company for their help in carrying out the bitumen experiments for this study.

Conflicts of interest:

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Received: April 4, 2024; Accepted: July 24, 2024; Prepublished online: August 23, 2024; Published: October 1, 2024  Show citation

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Najfabadi, S.C., Khabiri, M.M., & Sanij, H.K. (2024). Investigating the Characteristics of Modified Bitumen with Polyphosphoric Acid Polymers and Recycled Rubber. Communications - Scientific Letters of the University of Zilina, 26(4), D109-121. doi: 10.26552/com.C.2024.050
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