Analysis of fracture morphology of asphalt concrete under different temperatures

Abstract

By studying the fracture morphology of splitting failure and bending failure of asphalt mixture under different temperatures, it is confirmed that temperature has an impact on the micro mechanism of asphalt mixture fracture. The fracture at low temperature is relatively flat, the fracture of aggregate and asphalt aggregate interface account for a certain proportion, and the failure of asphalt mixture is mainly brittle fracture; With the increase of temperature, the fracture surface becomes rough, and the fracture of asphalt mortar layer is mainly; The addition of rubber powder improves the viscosity of asphalt and the bonding strength of asphalt mortar, greatly improves the fracture ratio of aggregate and interface area, and improves the crack resistance of asphalt mixture; The fracture morphology of asphalt mixture specimen better reflects its mechanical characteristics.