Modification mechanism of C9 petroleum resin and its influence on SBS modified asphalt

• Published in: Construction & building materials 2021-11, Vol.306, p.124740, Article 124740
• Main Authors: Zhang, Wengang, Qiu, Ling, Liu, Jianping, Hu, Kui, Zou, Ling, Chen, Yu, Yang, Chengxu, Wang, Fang, Zang, Jinhao
• Format: Article
• Language: English
• Subjects: C9 petroleum resin; Microstructure; SBS modified asphalt; Storage stability; Whole section fracture energy
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2021.124740

•The mechanism of C9/SBS modified asphalt was revealed from the micro-level.•The mechanical properties were revealed by Whole section fracture energy.•The performances of C9/SBS modified asphalt was systematically discussed. In this paper, C9 petroleum resin was used as the raw material, and the microstructure of C9/SBS modified asphalt at a different time under different C9 petroleum resin content was studied by fluorescence microscope. The mechanical properties were studied by using the whole section fracture energy, the pavement performance of C9/SBS modified asphalt was tested and analyzed. The results show that C9 petroleum resin is conducive to SBS particles being sheared into smaller particles under the same preparation process. The larger the content of C9 petroleum resin, the smaller the final size of SBS particles, and the smallest SBS particle size can be reduced by about half. When the content of C9 petroleum resin is more than 9%, the decreasing trend is no longer obvious. This phenomenon mainly occurs in the final stage of shearing. C9 petroleum resin can affect the swelling behaviour of SBS in asphalt and its final microstructure by reducing the particle size of SBS. The larger the content of C9 petroleum resin, the larger the area occupied by SBS after swelling, and the longer the skeleton length of SBS, the easier the crosslinking occurs and the denser the crosslinking network structure is formed. The addition of C9 petroleum resin can effectively improve the fracture energy density of SBS modified asphalt, and its mechanism is closely related to the effect of C9 petroleum resin on the shear particle size and final swelling degree of SBS particles. C9 petroleum resin can effectively hinder the floating and aggregation of SBS modifier in asphalt during high-temperature storage, thus improving the storage stability of SBS modified asphalt. The incorporation of C9 petroleum resin can significantly increase the viscosity of SBS modified asphalt, improve the low-temperature performance of SBS modified asphalt, and improve the anti-ageing performance of SBS modified asphalt. The results provide a new way to improve the performances of SBS modified asphalt.