Investigating the efficacy of multidimensional MoS2/PAN fiber composites within styrene-butadiene-styrene enhanced asphalt binder

• Published in: Construction & building materials 2024-02, Vol.416, p.135208, Article 135208
• Main Authors: Ren, Denghui, Xing, Susu, Luo, Wenjie, Meng, Fanyu, Zhao, Zhenxia, Feng, Quan, Li, Chunlin, Li, Jing
• Format: Article
• Language: English
• Subjects: Enhanced high and low-temperature performance; Fiber-reinforced SBS asphalt binder; Molybdenum disulfide nanoparticles; Mussel-inspired co-deposition surface modification; Polyacrylonitrile fiber reinforcement
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2024.135208

In this study, a pioneering surface modification technique in the development of fiber-modified asphalt binders, employing mussel-inspired chemistry principles, is proposed. By co-depositing tannic acid/polyethyleneimine (TA/PEI) and various crystalline forms of molybdenum disulfide (MoS2) on the surface of polyacrylonitrile (PAN) fibers, three types of PAN fibers with different surface morphologies (NF-PAN, NS-PAN, and NT-PAN) were successfully synthesized. This led to the preparation of three modified asphalt binders (NF-PAN/SBS, NS-PAN/SBS, and NT-PAN/SBS). Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray Spectroscopy (EDS), and Atomic Force Microscopy (AFM) tests demonstrated the effective combination of two-dimensional MoS2 with PAN fibers. They confirmed the enhancement in interfacial interaction between the fibers and asphalt due to the high specific surface area and Young’s modulus of NF-PAN. Further asphalt binder performance tests indicated that NF-PAN/SBS exhibited the best shear strength, viscoelastic properties, and thermal stability in high-temperature performance tests and the best creep recovery rate and stiffness modulus in low-temperature performance tests. Specifically, at a 2% fiber content, NF-PAN/SBS demonstrated improvements of 48.8% in complex modulus (G*), 55.5% in storage modulus (G'), and 45.3% in loss modulus (G'') compared to the asphalt binder with unmodified PAN (PAN/SBS), and an increase of 11.04 °C in thermal decomposition temperature, with an 11.17% and 24.32% improvement in creep recovery rate at low temperatures compared to PAN/SBS. Additionally, the addition of MoS2 also enhanced the microwave absorption capability of the fiber composite modified asphalt binder, providing a better internal heat source reception for subsequent road maintenance. This research offers a novel and sustainable solution for enhancing asphalt binders, particularly suitable for challenging environmental conditions. It is expected to provide more efficient and rational modification methods for fiber and nano two-dimensional material-modified asphalts and offers significant references for the composite and synergistic modification of various asphalt components. [Display omitted] •Co-deposition modification of PAN surface with TA/PEI and MoS2 based on mussel bionics.•Surface modification of PAN enhances the interfacial interaction of NF-PAN, NS-PAN, and NT-PAN with asphalt.•NF-PAN/SBS asphalt has the best high-temperature viscoelastic