A comprehensive study on the influence of Sasobit content on rheological properties and storage stability of CR/SBS composite-modified asphalt

Journal article (2025)

Authors

Kangzhi Zhao South China University of Technology
Yang Li South China University of Technology
Fuqiong He Guangdong Dr. Road Traffic Technology Co., Ltd.
Yuanyuan Meng Guangzhou Maritime University
Chichun Hu China-Singapore International Joint Research Institute, South China University of Technology
Xiangqian Ye South China University of Technology, KTH Royal Institute of Technology
P. Lin Pavement Engineering - CEG
Research Group
Pavement Engineering (CEG) (TU Delft)
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Published Date

2025

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Engineering Structures

Research Group

Pavement Engineering

Abstract

The CR/SBS composite-modified asphalt (CR/SBS-CMA) is recognized for its excellent rutting and fatigue resistance, but with poor workability. Sasobit has been introduced as an additive to improve the workability of CR/SBS-CMA. This study aims to investigate the effects of Sasobit content on the storage stability and rheological properties of CR/SBS-CMA. The Brookfield viscosity tests were used to measure the viscosity of samples. The Fourier transform infrared spectroscopy (FTIR) tests were conducted to study the modification mechanism. The cigar tube and fluorescence microscopy (FM) tests were employed to study the storage stability of samples. The penetration, softening point, and ductility of samples were assessed. The rheological behaviors of samples were assessed through dynamic shear rheometer (DSR) tests and bending beam rheometer (BBR) tests. The test results indicate that Sasobit can effectively reduce the viscosity of CR/SBS-CMA. Sasobit can also improve the rutting resistance, fatigue resistance, and storage stability of CR/SBS-CMA. However, Sasobit negatively affects the low-temperature performance of CR/SBS-CMA, so its content should be lower than 3 % when applied in areas with low temperatures. This study will contribute to the reduction of energy consumption and greenhouse gas emissions during the construction of CR/SBS-CMA pavement.

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