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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]
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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]
ISSN:13852000
DOI:10.1007/s11043-026-09879-z