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Macro–Micro Aging Mechanisms and Correlation Analysis of Asphalt Under Light–Heat–Oxygen Coupling Action.

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Title: Macro–Micro Aging Mechanisms and Correlation Analysis of Asphalt Under Light–Heat–Oxygen Coupling Action.
Authors: Xi, Han1,2 (AUTHOR) 18303863302@163.com, Hu, Shixiong1,2 (AUTHOR), Zheng, Yuanxun3 (AUTHOR), Fu, Senfeng4 (AUTHOR)
Source: Materials (1996-1944). Jul2026, Vol. 19 Issue 14, p2966. 18p.
Subjects: Asphalt, Functional groups, Rheology, Photooxidation, Statistical correlation
Geographic Terms: China
Abstract: To investigate the macroscopic and microscopic aging mechanisms of asphalt under combined light, heat, and oxygen exposure in southwestern China, four aging schemes were designed and tested on three base asphalts. Chemical changes—components, elements, and functional groups—were characterized by SARA and elemental analyses, and FTIR. High- and low-temperature rheological properties were measured via MSCR and BBR tests, and the gray correlation method linked microscopic mechanisms to macroscopic performance. The results show that coupled aging causes bond breakage and dehydrogenation, with recombined small molecules increasing the asphaltene content. Dehydrogenated bonds combine with oxygen to form polar functional groups, increasing chain stiffness and restricting internal rotation. Macroscopically, high-temperature performance improves while low-temperature performance degrades. Carbonyl and sulfoxide indices serve as effective aging indicators. Correlation analysis identifies functional group changes as the most significant factor affecting rheological decay. Engineering implications are as follows: oxygen-containing polar groups enhance chemical stability but accelerate low-temperature performance loss; thus, their evolution should be monitored in high-radiation, high-temperature regions to mitigate premature cracking. [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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DbLabel: Engineering Source
An: 195806405
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PubType: Academic Journal
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  Data: Macro–Micro Aging Mechanisms and Correlation Analysis of Asphalt Under Light–Heat–Oxygen Coupling Action.
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Jul2026, Vol. 19 Issue 14, p2966. 18p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Asphalt%22">Asphalt</searchLink><br /><searchLink fieldCode="DE" term="%22Functional+groups%22">Functional groups</searchLink><br /><searchLink fieldCode="DE" term="%22Rheology%22">Rheology</searchLink><br /><searchLink fieldCode="DE" term="%22Photooxidation%22">Photooxidation</searchLink><br /><searchLink fieldCode="DE" term="%22Statistical+correlation%22">Statistical correlation</searchLink>
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  Group: Su
  Data: <searchLink fieldCode="DE" term="%22China%22">China</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: To investigate the macroscopic and microscopic aging mechanisms of asphalt under combined light, heat, and oxygen exposure in southwestern China, four aging schemes were designed and tested on three base asphalts. Chemical changes—components, elements, and functional groups—were characterized by SARA and elemental analyses, and FTIR. High- and low-temperature rheological properties were measured via MSCR and BBR tests, and the gray correlation method linked microscopic mechanisms to macroscopic performance. The results show that coupled aging causes bond breakage and dehydrogenation, with recombined small molecules increasing the asphaltene content. Dehydrogenated bonds combine with oxygen to form polar functional groups, increasing chain stiffness and restricting internal rotation. Macroscopically, high-temperature performance improves while low-temperature performance degrades. Carbonyl and sulfoxide indices serve as effective aging indicators. Correlation analysis identifies functional group changes as the most significant factor affecting rheological decay. Engineering implications are as follows: oxygen-containing polar groups enhance chemical stability but accelerate low-temperature performance loss; thus, their evolution should be monitored in high-radiation, high-temperature regions to mitigate premature cracking. [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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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.3390/ma19142966
    Languages:
      – Code: eng
        Text: English
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        PageCount: 18
        StartPage: 2966
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      – SubjectFull: Asphalt
        Type: general
      – SubjectFull: Functional groups
        Type: general
      – SubjectFull: Rheology
        Type: general
      – SubjectFull: Photooxidation
        Type: general
      – SubjectFull: Statistical correlation
        Type: general
      – SubjectFull: China
        Type: general
    Titles:
      – TitleFull: Macro–Micro Aging Mechanisms and Correlation Analysis of Asphalt Under Light–Heat–Oxygen Coupling Action.
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            NameFull: Xi, Han
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            NameFull: Hu, Shixiong
      – PersonEntity:
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            NameFull: Zheng, Yuanxun
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            NameFull: Fu, Senfeng
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            – D: 15
              M: 07
              Text: Jul2026
              Type: published
              Y: 2026
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              Value: 19
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              Value: 14
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            – TitleFull: Materials (1996-1944)
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