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Influence of Aldehyde-Based Modifiers on Rubber Asphalt: Properties, Deodorization Effect, and Mechanistic Analysis.

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Title: Influence of Aldehyde-Based Modifiers on Rubber Asphalt: Properties, Deodorization Effect, and Mechanistic Analysis.
Authors: Zhang, Honggang1,2 (AUTHOR), Lei, Jiechao1,2 (AUTHOR) leijc99@163.com, Huang, Hui1,3 (AUTHOR), Wang, Xiaowen1 (AUTHOR), Meng, Yongjun2 (AUTHOR), Shao, Pengkun1,3 (AUTHOR), Zeng, Lihao1,3 (AUTHOR)
Source: Polymers (20734360). Apr2026, Vol. 18 Issue 7, p799. 15p.
Subjects: Asphalt modifiers, Deodorization, Fluorescence microscopy, Bitumen, Volatile organic compounds, Fourier transform infrared spectroscopy, Asphalt
Abstract: A sustainable way to recycle used tires and improve the functionality of asphalt pavements is through the use of crumb rubber modified asphalt (CRMA). However, its application during high-temperature construction raises environmental and occupational health concerns due to the release of significant quantities of odorous and potentially harmful gases. Therefore, this study selected α-Amyl cinnamic aldehyde (ACA) as a deodorant and added it to CRMA at proportions of 0.5%, 1.0%, 1.5%, and 2.0% to prepare DCRMA. A number of common tests, such as softening point, ductility, penetration, Brookfield rotational viscosity, and segregation analysis, were used to evaluate the basic characteristics of the modified asphalt. A self-developed asphalt fume monitoring device was used to quantitatively analyze the changes in VOCs, H2S gas concentration, and solid particle content in the asphalt fumes to assess the deodorization effect of ACA on CRMA. Furthermore, the deodorization mechanism of ACA on CRMA was explored in depth using microscopic methods, such as fluorescence microscopy (FM) and Fourier transform infrared spectroscopy (FTIR). The findings demonstrated that ACA can increase the softening point and viscosity of CRMA while decreasing its penetration and ductility. The storage stability was optimal at a 1.0% ACA addition. Additionally, as the ACA content increased, the concentrations of VOCs, H2S gas, and solid particles in the asphalt fumes continued to decrease. FM results indicated that when the ACA content did not exceed 1.0%, it promoted the swelling degree of CR in the asphalt. FTIR results showed that ACA can reduce the characteristic peak intensity of CRMA. This study offers important technical references and practical support for the environmentally friendly use of CRMA. [ABSTRACT FROM AUTHOR]
Copyright of Polymers (20734360) 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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  Data: Influence of Aldehyde-Based Modifiers on Rubber Asphalt: Properties, Deodorization Effect, and Mechanistic Analysis.
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  Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Apr2026, Vol. 18 Issue 7, p799. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Asphalt+modifiers%22">Asphalt modifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Deodorization%22">Deodorization</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorescence+microscopy%22">Fluorescence microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Bitumen%22">Bitumen</searchLink><br /><searchLink fieldCode="DE" term="%22Volatile+organic+compounds%22">Volatile organic compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Fourier+transform+infrared+spectroscopy%22">Fourier transform infrared spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Asphalt%22">Asphalt</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A sustainable way to recycle used tires and improve the functionality of asphalt pavements is through the use of crumb rubber modified asphalt (CRMA). However, its application during high-temperature construction raises environmental and occupational health concerns due to the release of significant quantities of odorous and potentially harmful gases. Therefore, this study selected α-Amyl cinnamic aldehyde (ACA) as a deodorant and added it to CRMA at proportions of 0.5%, 1.0%, 1.5%, and 2.0% to prepare DCRMA. A number of common tests, such as softening point, ductility, penetration, Brookfield rotational viscosity, and segregation analysis, were used to evaluate the basic characteristics of the modified asphalt. A self-developed asphalt fume monitoring device was used to quantitatively analyze the changes in VOCs, H2S gas concentration, and solid particle content in the asphalt fumes to assess the deodorization effect of ACA on CRMA. Furthermore, the deodorization mechanism of ACA on CRMA was explored in depth using microscopic methods, such as fluorescence microscopy (FM) and Fourier transform infrared spectroscopy (FTIR). The findings demonstrated that ACA can increase the softening point and viscosity of CRMA while decreasing its penetration and ductility. The storage stability was optimal at a 1.0% ACA addition. Additionally, as the ACA content increased, the concentrations of VOCs, H2S gas, and solid particles in the asphalt fumes continued to decrease. FM results indicated that when the ACA content did not exceed 1.0%, it promoted the swelling degree of CR in the asphalt. FTIR results showed that ACA can reduce the characteristic peak intensity of CRMA. This study offers important technical references and practical support for the environmentally friendly use of CRMA. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Polymers (20734360) 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/polym18070799
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      – Code: eng
        Text: English
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        PageCount: 15
        StartPage: 799
    Subjects:
      – SubjectFull: Asphalt modifiers
        Type: general
      – SubjectFull: Deodorization
        Type: general
      – SubjectFull: Fluorescence microscopy
        Type: general
      – SubjectFull: Bitumen
        Type: general
      – SubjectFull: Volatile organic compounds
        Type: general
      – SubjectFull: Fourier transform infrared spectroscopy
        Type: general
      – SubjectFull: Asphalt
        Type: general
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      – TitleFull: Influence of Aldehyde-Based Modifiers on Rubber Asphalt: Properties, Deodorization Effect, and Mechanistic Analysis.
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              M: 04
              Text: Apr2026
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              Y: 2026
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