Swelling behavior and mechanism of SBS in high viscoelastic-modified bitumen using fluorescence analysis

IF 9.6 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Traffic and Transportation Engineering-English Edition Pub Date : 2026-08-01 Epub Date: 2026-07-02 DOI:10.1016/j.jtte.2024.09.015

Yuanyuan Li, Gangping Jiang, Bin Xiang, Shuting Yan, Yilun Shen, Zirong Ma, Haowen Ji

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引用次数: 0

Abstract

High viscoelastic-modified bitumen (HVE-MB) contains a variety of modifiers, with SBS being the primary one, and its swelling state has a significant impact on the viscoelastic properties of bitumen. Based on fluorescence microscopy technology, the phase distribution and swelling state of SBS in HVE-MB under different shear times were studied, and the swelling behavior of SBS in HVE-MB was quantitatively characterized. The results can be used to reveal the swelling mechanism of the SBS modifier in HVE-MB. In addition, the physical properties, rheological properties, and viscoelasticity of HVE-MB were investigated with the physical test, rheological test, dynamic viscosity, and elastic recovery tests. The results show that shear time had a significant impact on the physical properties of HVE-MB, and the rheological properties exhibited a similar change trend. The swollen and developed SBS particles in HVE-MB were quantitatively characterized, indicating a 96% reduction in the number of SBS modifier particles. The ratio of SBS modifier particles to the axial length increased by 16%with particle size is increased from 4 to 7 um to 8–22 um. The shape of the particles transitioned from circular to elliptical and elongated forms. The area ratio of the SBS particles to bitumen increased by 14.9%, and the average area of SBS particles grew by 1948%. these changes contributes to a 277% increase in the dynamic viscosity of the bitumen. These changes occur because, at the microscopic level, polymers like SBS absorb light components from the bitumen after blending, causing the polymers to swell and form a two-phase structure where the swollen polymer phase coexists with the bitumen phase. The results can be used to optimize the heating temperature and shearing time for the industrial production of HVE-MB, providing reference and theoretical support for understanding the modification mechanism and performance regulation of HVE-MB.

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SBS在高粘弹改性沥青中的溶胀行为及机理研究

高粘弹改性沥青（HVE-MB）含有多种改性剂，以SBS为主要改性剂，其膨胀状态对沥青的粘弹性能有显著影响。基于荧光显微镜技术，研究了不同剪切次数下SBS在HVE-MB中的相分布和溶胀状态，定量表征了SBS在HVE-MB中的溶胀行为。该结果可用于揭示SBS改性剂在HVE-MB中的溶胀机制。通过物理测试、流变测试、动态粘度测试和弹性恢复测试，研究了HVE-MB的物理性能、流变性能和粘弹性。结果表明，剪切时间对HVE-MB的物理性质有显著影响，其流变性能也呈现出类似的变化趋势。对HVE-MB中肿胀和发育的SBS颗粒进行了定量表征，表明SBS改性颗粒的数量减少了96%。SBS改性剂与轴长之比随着粒径从4 ~ 7 um增加到8 ~ 22 um，增加了16%。粒子的形状由圆形转变为椭圆形和细长的形状。SBS颗粒与沥青的面积比增加了14.9%，SBS颗粒的平均面积增加了1948%。这些变化使沥青的动态粘度增加了277%。这些变化的发生是因为，在微观层面上，像SBS这样的聚合物在混合后从沥青中吸收了轻质成分，导致聚合物膨胀并形成两相结构，膨胀的聚合物相与沥青相共存。研究结果可为HVE-MB的工业化生产优化加热温度和剪切时间，为了解HVE-MB的改性机理和性能调控提供参考和理论支持。

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来源期刊

Journal of Traffic and Transportation Engineering-English Edition TRANSPORTATION SCIENCE & TECHNOLOGY-

CiteScore

13.60

自引率

6.30%

发文量

402

审稿时长

15 weeks

期刊介绍： The Journal of Traffic and Transportation Engineering (English Edition) serves as a renowned academic platform facilitating the exchange and exploration of innovative ideas in the realm of transportation. Our journal aims to foster theoretical and experimental research in transportation and welcomes the submission of exceptional peer-reviewed papers on engineering, planning, management, and information technology. We are dedicated to expediting the peer review process and ensuring timely publication of top-notch research in this field.