Microstructural Insights into the Surface Morphology of Asphalt Composites: Implications for Interface Performance and Mechanical Properties

Abstract

This study investigates the micro-surface morphology of a representative asphalt composite material using scanning electron microscopy (SEM), complemented by theoretical considerations of X-ray diffraction (XRD) and thermogravimetric analysis/differential scanning calorimetry (TGA/DSC). The primary objective is to establish a preliminary understanding of the correlations between the observed microstructural features, particularly the embedded particulate phase and its interface with the asphalt matrix, and the material’s potential mechanical performance, including interfacial bonding strength, crack resistance, and overall homogeneity. The SEM image reveals a complex morphology characterized by irregularly shaped particles embedded within a textured asphalt matrix, suggesting a composite nature. Based on these morphological observations and general principles of composite material science, we predict that the material exhibits a moderate to good interfacial adhesion, potentially contributing to enhanced cracking resistance, although localized inhomogeneities are also noted. Theoretical discussions of XRD and TGA/DSC data further support the hypothesized composition and thermal stability. This preliminary microstructural analysis provides valuable insights into the fundamental properties of asphalt composites and highlights the critical role of micro-interfacial characteristics in determining macroscopic performance. Future experimental validation through advanced characterization and direct mechanical testing is recommended.