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Physical, Rheological and Microstructural Properties of Asphalt Modified by Low-Molecular-Weight Polyolefin.

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Title: Physical, Rheological and Microstructural Properties of Asphalt Modified by Low-Molecular-Weight Polyolefin.
Authors: He, Jun1 (AUTHOR) hejun0607@whut.edu.cn, Leng, Binbin2 (AUTHOR), Chen, Meizhu3 (AUTHOR), Guo, Shijie1,2 (AUTHOR), Yu, Jingjun1,2 (AUTHOR)
Source: Materials (1996-1944). Feb2026, Vol. 19 Issue 3, p571. 16p.
Subjects: Polyolefins, Thermal stability, Thermal resistance, Low temperature engineering, Asphalt modifiers, Rheology, Microstructure
Abstract: Improving both the high- and low-temperature performance of asphalt is still difficult in modern pavement applications. This performance imbalance has motivated the development of new modification strategies that can enhance temperature stability while maintaining construction workability. In this research, a low-molecular-weight elastic polyolefin (POL) with inherent compatibility was introduced as a novel asphalt modifier. POL was incorporated at five dosages (0%, 2%, 4%, 6%, and 8% by weight of asphalt) to investigate its effects on the fundamental physical, rheological, and low-temperature properties of the asphalt. The rheological behavior was characterized by dynamic shear rheometer (DSR) and bending beam rheometer (BBR), while the modification mechanism and dispersion morphology were analyzed through Fourier-transform infrared spectroscopy (FT-IR) and fluorescence microscopy (FM). The results reveal that POL markedly improves the high-temperature performance and workability of asphalt, with the rutting factor increasing by two- to eightfold. POL modification improved the thermal stability of asphalt, shifting the maximum decomposition temperature from 455.2 °C for the base binder to 461–463 °C, while the total mass loss remained nearly constant at 80–83%. Microscopic observations confirm that POL forms a physically blended network within the asphalt matrix, exhibiting a green fluorescent structure that becomes progressively continuous with increasing dosage. The most homogeneous dispersion and optimal compatibility occur at a POL dosage of 6%, beyond which phase segregation emerges and low-temperature properties deteriorate. Accordingly, a 6% POL dosage is recommended for achieving balanced performance. These findings provide theoretical and practical guidance for the development of balanced performance and thermally stable POL-modified asphalt materials. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Physical, Rheological and Microstructural Properties of Asphalt Modified by Low-Molecular-Weight Polyolefin.
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  Data: <searchLink fieldCode="AR" term="%22He%2C+Jun%22">He, Jun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hejun0607@whut.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Leng%2C+Binbin%22">Leng, Binbin</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Meizhu%22">Chen, Meizhu</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Guo%2C+Shijie%22">Guo, Shijie</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Jingjun%22">Yu, Jingjun</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Feb2026, Vol. 19 Issue 3, p571. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Polyolefins%22">Polyolefins</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stability%22">Thermal stability</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+resistance%22">Thermal resistance</searchLink><br /><searchLink fieldCode="DE" term="%22Low+temperature+engineering%22">Low temperature engineering</searchLink><br /><searchLink fieldCode="DE" term="%22Asphalt+modifiers%22">Asphalt modifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Rheology%22">Rheology</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Improving both the high- and low-temperature performance of asphalt is still difficult in modern pavement applications. This performance imbalance has motivated the development of new modification strategies that can enhance temperature stability while maintaining construction workability. In this research, a low-molecular-weight elastic polyolefin (POL) with inherent compatibility was introduced as a novel asphalt modifier. POL was incorporated at five dosages (0%, 2%, 4%, 6%, and 8% by weight of asphalt) to investigate its effects on the fundamental physical, rheological, and low-temperature properties of the asphalt. The rheological behavior was characterized by dynamic shear rheometer (DSR) and bending beam rheometer (BBR), while the modification mechanism and dispersion morphology were analyzed through Fourier-transform infrared spectroscopy (FT-IR) and fluorescence microscopy (FM). The results reveal that POL markedly improves the high-temperature performance and workability of asphalt, with the rutting factor increasing by two- to eightfold. POL modification improved the thermal stability of asphalt, shifting the maximum decomposition temperature from 455.2 °C for the base binder to 461–463 °C, while the total mass loss remained nearly constant at 80–83%. Microscopic observations confirm that POL forms a physically blended network within the asphalt matrix, exhibiting a green fluorescent structure that becomes progressively continuous with increasing dosage. The most homogeneous dispersion and optimal compatibility occur at a POL dosage of 6%, beyond which phase segregation emerges and low-temperature properties deteriorate. Accordingly, a 6% POL dosage is recommended for achieving balanced performance. These findings provide theoretical and practical guidance for the development of balanced performance and thermally stable POL-modified asphalt materials. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/ma19030571
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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: Thermal stability
        Type: general
      – SubjectFull: Thermal resistance
        Type: general
      – SubjectFull: Low temperature engineering
        Type: general
      – SubjectFull: Asphalt modifiers
        Type: general
      – SubjectFull: Rheology
        Type: general
      – SubjectFull: Microstructure
        Type: general
    Titles:
      – TitleFull: Physical, Rheological and Microstructural Properties of Asphalt Modified by Low-Molecular-Weight Polyolefin.
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            NameFull: He, Jun
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            NameFull: Leng, Binbin
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            NameFull: Chen, Meizhu
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            – D: 01
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
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              Value: 19
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