Research on the micro-nano characteristic of basalt fiber and its impact on the performance of relevant asphalt mastic

Abstract

The surface properties have significant impacts on the performance of fiber composites. To evaluate the effects of fiber modification on the rheological and interface adhesion properties of basalt fiber asphalt mastic (BFAM), basalt fiber (BF) was modified using a silane coupling agent to prepare BFAM. The micro-nano characteristics of BF were evaluated by Scanning electron microscope, Fourier transform infrared spectroscopy, Surface energy test and X-ray energy dispersive spectroscopy. The rheologicalproperties of BFAM were examined by dynamic shear rheological (DSR) test and bending beam rheological (BBR) test. Besides, the pull-out test was employed to assess the interfacial adhesion between fiber and asphalt, the relationship between the rheologicaland adhesion properties was also analyzed. The results showed that modified basalt fiber (MBF) has higher surface energy and roughness than the original fiber. The reaction process on fiber surface slowed down when the modification time exceeded 30 min and the concentration exceeded 2.0%. MBF showed a better enhancement effect on the high / low temperature rheological properties of asphalt mastic than BF. The enhancement of rheological properties is positively correlated with the interface adhesion. The findings provide significant guidance for the application and promotion of fiber asphalt pavements.