Shear rheology and microstructure of mining material-bitumen composites as filler replacement in asphalt mastics

摘要

Magnetite is a mineral that occurs in many types of igneous rock and can be found in large quantities in fluvial and marine environments. It can also be extracted by reprocessing of existing mine tailings. In this paper, magnetite supplied from two different mining sites was evaluated as a substitution of natural limestone filler in asphalt mix design. Magnetite and limestone fillers were added to the bitumen according to three filler/bitumen ratios to form composite asphalt mastics.