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Incorporating Ground Tire Rubber (GTR) into asphalts can help improve the performance of pavements across different temperatures and loading conditions. However, is expected that the increased viscosity associated with GTR leads to higher mixing and compaction temperatures, which can raise production costs and emissions. The objective of this study is to evaluate the rheological properties and effects of fast-pyrolysis wax derived from Post-Consumer Waste (PCW) on the viscosity, performance, and chemical interactions of GTR-modified binders. The experimental program included Rotational Viscometer (RV) testing, storage stability analysis, high- and intermediate-temperature Performance Grade (PG) characterization, Multiple Stress Creep Recovery (MSCR), Bending Beam Rheometer (BBR) test, and Fourier Transform Infrared Spectroscopy (FTIR). Blends were prepared with 10% GTR and 5% PCW wax. Results showed that the use of the PCW-derived fast-pyrolysis wax reduced mixing and compaction temperatures while preserving rutting and fatigue performance. GTR reduced storage stability, while the pyrolytic wax negatively affected low-temperature performance. Furthermore, chemical interactions were observed in the wax–GTR blends, and the PCW pyrolytic wax mitigated oxidative aging. Overall, incorporating fast-pyrolysis wax into GTR-modified binders lowers production temperatures, enhances energy efficiency, and supports more sustainable paving practices.

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Rheological Analysis of Fast Pyrolysis Wax as a Viscosity Modifier for Ground Tire Rubber-Modified Binders

  • 会议论文

  • 发表日期：

    2026年

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  • Ataslina de Paula da Silva,
  • Isabel E. Coffman,
  • R. Christopher Williams,
  • Xianglan Bai

摘要

Incorporating Ground Tire Rubber (GTR) into asphalts can help improve the performance of pavements across different temperatures and loading conditions. However, is expected that the increased viscosity associated with GTR leads to higher mixing and compaction temperatures, which can raise production costs and emissions. The objective of this study is to evaluate the rheological properties and effects of fast-pyrolysis wax derived from Post-Consumer Waste (PCW) on the viscosity, performance, and chemical interactions of GTR-modified binders. The experimental program included Rotational Viscometer (RV) testing, storage stability analysis, high- and intermediate-temperature Performance Grade (PG) characterization, Multiple Stress Creep Recovery (MSCR), Bending Beam Rheometer (BBR) test, and Fourier Transform Infrared Spectroscopy (FTIR). Blends were prepared with 10% GTR and 5% PCW wax. Results showed that the use of the PCW-derived fast-pyrolysis wax reduced mixing and compaction temperatures while preserving rutting and fatigue performance. GTR reduced storage stability, while the pyrolytic wax negatively affected low-temperature performance. Furthermore, chemical interactions were observed in the wax–GTR blends, and the PCW pyrolytic wax mitigated oxidative aging. Overall, incorporating fast-pyrolysis wax into GTR-modified binders lowers production temperatures, enhances energy efficiency, and supports more sustainable paving practices.