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. 2022 Jun 17;14(12):2476.
doi: 10.3390/polym14122476.

Viscoelastic Behavior and Phase Structure of High-Content SBS-Modified Asphalt

Dongdong Yuan  1   2 , Chengwei Xing  1   2 , Wei Jiang  1   2 , Jingjing Xiao  3 , Wangjie Wu  1   2 , Pengfei Li  1   2 , Yupeng Li  1   2
Affiliations

Viscoelastic Behavior and Phase Structure of High-Content SBS-Modified Asphalt

Dongdong Yuan et al. Polymers (Basel). .

Abstract

To investigate the effect of styrene-butadiene-styrene (SBS) modifier content on the viscoelastic behavior of SBS-modified asphalt (SBSMA) at different temperatures and phase structures, the star SBS modifier was chosen to fabricate seven types of SBSMA with different contents. Multiple stress creep recovery (MSCR), linear amplitude sweep (LAS), and low-temperature frequency sweep tests were adopted to study the influence of SBS modifier content on the viscoelastic performance of SBSMA at high to low temperatures. The SBSMA's microstructure with different contents was investigated using a fluorescence microscope. The results indicated that the change in non-recoverable creep compliance and creep recovery rate was bounded by 4.5% content at high temperatures, with an apparent turning point. The changing slope of content at less than 4.5% was much higher than that of the content greater than 4.5%. At medium temperatures, the fatigue life of SBSMA increased exponentially with the rising modifier content. The rate of increase in fatigue life was the largest as the content increased from 4.5% to 6.0%. At low temperatures, the low-temperature viscoelastic property index G (60 s) of SBSMA decreased logarithmically as the modifier content increased. In terms of the microscopic phase structure, the SBS modifier gradually changed from the dispersed to the continuous phase state with the increasing SBS modifier content.

Keywords: SBS; high-content polymer modified asphalt; phase structure; viscoelastic behavior.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Linear SBS and Star SBS.
Figure 2
Figure 2
Flowchart of this study.
Figure 3
Figure 3
Preparation process of SBSMA.
Figure 4
Figure 4
Non-recoverable creep compliance and creep recovery rate of asphalt.
Figure 5
Figure 5
The change rate of Jnr and R. (a) non-recoverable creep compliance; (b) Creep recovery rate.
Figure 6
Figure 6
Jnr-diff of eight types of asphalt.
Figure 7
Figure 7
Stress–strain response of asphalt.
Figure 8
Figure 8
Damage characteristic curves of asphalt.
Figure 9
Figure 9
Fatigue life of asphalt.
Figure 10
Figure 10
Modulus and phase angle of asphalt at −5 °C.
Figure 11
Figure 11
Modulus and phase angle of asphalt at −15 °C.
Figure 12
Figure 12
Main curve of relaxation modulus of asphalt at low temperatures (−15 °C).
Figure 13
Figure 13
Evaluation index G (60 s) of asphalt at low temperatures.
Figure 14
Figure 14
Evaluation index mr (60 s) of asphalt at low temperatures.
Figure 15
Figure 15
Fluorescent microscopic images of asphalt. (a) Neat asphalt, (b) 3.0% SBSMA, (c) 4.5% SBSMA, (d) 6.0% SBSMA, (e) 7.5% SBSMA, (f) 9.0% SBSMA, (g) 10.5% SBSMA, (h) 12.0% SBSMA.
Figure 15
Figure 15
Fluorescent microscopic images of asphalt. (a) Neat asphalt, (b) 3.0% SBSMA, (c) 4.5% SBSMA, (d) 6.0% SBSMA, (e) 7.5% SBSMA, (f) 9.0% SBSMA, (g) 10.5% SBSMA, (h) 12.0% SBSMA.
See this image and copyright information in PMC

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