Surface modification of basalt with silane coupling agent on asphalt mixture moisture damage

• Published in: Applied surface science 2015-08, Vol.346, p.497-502
• Main Authors: Min, Yahong, Fang, Ying, Huang, Xiaojun, Zhu, Yinhui, Li, Wensheng, Yuan, Jianmin, Tan, Ligang, Wang, Shuangyin, Wu, Zhenjun
• Format: Article
• Language: English
• Subjects: Asphalt; Basalt; Basalt rocks; Coupling agents; Fourier transforms; Interfacial performance; Moisture; Moisture sensitivity; Rocks; Silane coupling agent; Silanes; Surface modification; X-ray photoelectron spectroscopy
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2015.04.002

•A new silane coupling agent was synthesized based on KH570.•Basalt surface was modified using the new silane coupling agent.•Chemical bond between basalt and the new silane coupling agent was formed.•Asphalt mixture which used modified basalt show superior water stability. A new silane coupling agent was synthesized based on γ-(methacryloyloxy) propyltrimethoxysilane (KH570). The surface of basalt rocks was modified by KH570 and the new silane coupling agent (NSCA), and the interfacial interaction between silane coupling agent and basalt was also studied. Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis showed that the silane coupling agent molecule bound strongly with basalt rocks. Scanning electronic microscopy (SEM) observation showed that a thin layer of coupling agent was formed on the surface of modified basalt. The boiling test and immersion Marshall test confirmed that the moisture sensitivity of basalt modified with the new silane coupling agent increased more significantly than that untreated and treated with KH570. The Retained Marshall Strength of basalt modified with the new coupling agent increased from 71.74% to 87.79% compared with untreated basalt. The results indicated that the new silane coupling agent played an important role in improving the interfacial performance between basalt and asphalt.