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Synergistic effects of SBS polymer degradation and binder stiffening on the rheological properties of SBS-modified asphalt during RTFO aging.

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Title: Synergistic effects of SBS polymer degradation and binder stiffening on the rheological properties of SBS-modified asphalt during RTFO aging.
Authors: Sharma, Alok1 (AUTHOR), Ransinchung R.N, G. D.2 (AUTHOR), Ravindranath, Sham S.1 (AUTHOR) sham.ravindranath@pe.iitr.ac.in
Source: Mechanics of Time-Dependent Materials. Jun2026, Vol. 30 Issue 2, p1-30. 30p.
Abstract: During pavement construction, styrene–butadiene–styrene (SBS) modified asphalt binders (SBS-ABs) undergo short-term thermo-oxidative aging, during which SBS macromolecules degrade concurrently with the stiffening of the asphalt binder. In this paper, the coupled influence of these mechanisms on the rheological behavior of SBS-ABs is investigated over a wide range of angular frequencies and SBS dosages. Rheological results show that at low angular frequencies (ω < 1 rad/s), rolling thin film oven (RT-FO) aged SBS-ABs exhibit substantially reduced viscoelastic properties compared with unaged binders at higher service temperatures, including decreases of approximately 50–70% in complex viscosity (η *), storage modulus (G′), and complex modulus (G*). In addition, RTFO-aged binders display phase angle increases of approximately 15–30°, reflecting deterioration of the SBS-maltene-rich network. The strong dependence on slower ω arises from the sluggish mobility of SBS molecules and the presence of SBS-maltene-rich network in the asphalt binder, and the effect of RT-FO aging is found to be most pronounced at SBS dosages between 3 and 5 wt.%. These results demonstrate that the synergistic effects of SBS polymer degradation and binder stiffening can be effectively characterized only when rheological measurements span a broad frequency range (0.01–10 rad/s) and SBS content (2–7 wt.%). The findings provide practical guidance for SBS-modified binder formulation and performance evaluation during construction-related aging. [ABSTRACT FROM AUTHOR]
Copyright of Mechanics of Time-Dependent Materials is the property of Springer Nature 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: 194769504
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  Data: Synergistic effects of SBS polymer degradation and binder stiffening on the rheological properties of SBS-modified asphalt during RTFO aging.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Mechanics+of+Time-Dependent+Materials%22&quot;&gt;Mechanics of Time-Dependent Materials&lt;/searchLink&gt;. Jun2026, Vol. 30 Issue 2, p1-30. 30p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: During pavement construction, styrene–butadiene–styrene (SBS) modified asphalt binders (SBS-ABs) undergo short-term thermo-oxidative aging, during which SBS macromolecules degrade concurrently with the stiffening of the asphalt binder. In this paper, the coupled influence of these mechanisms on the rheological behavior of SBS-ABs is investigated over a wide range of angular frequencies and SBS dosages. Rheological results show that at low angular frequencies (ω &lt; 1 rad/s), rolling thin film oven (RT-FO) aged SBS-ABs exhibit substantially reduced viscoelastic properties compared with unaged binders at higher service temperatures, including decreases of approximately 50–70% in complex viscosity (η *), storage modulus (G′), and complex modulus (G*). In addition, RTFO-aged binders display phase angle increases of approximately 15–30&#176;, reflecting deterioration of the SBS-maltene-rich network. The strong dependence on slower ω arises from the sluggish mobility of SBS molecules and the presence of SBS-maltene-rich network in the asphalt binder, and the effect of RT-FO aging is found to be most pronounced at SBS dosages between 3 and 5 wt.%. These results demonstrate that the synergistic effects of SBS polymer degradation and binder stiffening can be effectively characterized only when rheological measurements span a broad frequency range (0.01–10 rad/s) and SBS content (2–7 wt.%). The findings provide practical guidance for SBS-modified binder formulation and performance evaluation during construction-related aging. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Mechanics of Time-Dependent Materials is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder&#39;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.&lt;/i&gt; (Copyright applies to all Abstracts.)
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              Text: Jun2026
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              Y: 2026
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