Abstract
The difference of the macadam composition directly affects the texture characteristics of the macadam surface. Through the microscopic digital image analysis of macadam, this paper compares and analyses the distribution area ratio, perimeter, dendritic features and fractal features of main chemical components. Taking gravels of basalt, andesite and limestone as specimens, the author established a distribution model of texture features, and created 2D and 3D spaces based on the typical indices. The results show that: the basalt had limited dendritic structure, simple fractal, and smooth texture; the andesite had a wavy distribution of main components and an obvious dendritic structure; the limestone had a non-uniform distribution of main components, a large fractal value, and complex and changeable edges of principal components. This research proves that the 3D distribution space is an effective way to distinguish the texture features of the three types of rock, and lays a basis for the creation of 3D distribution model for the macadam texture characteristics.
